- Chimera-users - RBVI Mailing Lists

Electron density
by C. Parry 22 Jun '05

22 Jun '05

Could anyone help with loading and displaying CNS or XPLOR electron density maps in Chimera. I have tried many times and also the dialog boxes in the user guide do not exactly correspond to the version (12/2004) of Chimera I have. Thanks. ____________________________________________________ Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football http://football.fantasysports.yahoo.com

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mutation tool?
by ROBERT LAVIERI 17 Jun '05

17 Jun '05

I am exploring/using the program and I was wondering if there was any sort of point mutation tool? Such that one could graphically see say a mutation like ser23trp? Thanks, Robert R Lavieri

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how to open bug-report dialog in v1.2105
by Sabuj Pattanayek 13 Jun '05

13 Jun '05

Hi, In v1.2105 (irix) the report a bug command under the help menu is not available (as stated in the current development documentation I assume for v1.2129). How do I open the bug report submission dialog from the command line or from the menus even if a crash or error has not occurred? Thanks, Sabuj Pattanayek

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Stereo monitors
by Thomas Goddard 06 Jun '05

06 Jun '05

Steve Ludtke reports what his lab is using for hardware stereo. Tom ------- Start of forwarded message ------- Date: Mon, 6 Jun 2005 12:59:39 -0500 (CDT) From: Steve Ludtke <stevel(a)blake.3dem.bioch.bcm.tmc.edu> Reply-To: sludtke(a)bcm.tmc.edu To: Thomas Goddard <goddard(a)cgl.ucsf.edu> Subject: Re: Chimera Suggestion We have the Sharp 15" one. As I said, it works ok as long as you stay in the sweet spot, but gives me a nasty headache (which the glasses do not). We haven't tried any of the high-refresh LCD's yet. We still use CRT's for that at the moment. We're about to try a homebrew polarized glasses solution. We do actually have a (800x600) high refresh projector for use with the shutter glasses which works well. - ---------------------------------------------------------------------------- Steven Ludtke, PhD | Baylor College of Medicine sludtke(a)bcm.tmc.edu | Asst. Professor & Co-Director stevel(a)alumni.caltech.edu | National Center For Macromolecular Imaging V: (713)798-9020 | Dept of Biochemistry and Mol. Biol. F: (713)798-1625 | instant messenger: sludtke42 | Those who Do, Are http://ncmi.bcm.tmc.edu/~stevel | The converse also applies On Mon, 6 Jun 2005, Thomas Goddard wrote: > Hi Steve, > > Our stereo monitor that requires no glasses was a 20" flat panel > type display from Opticality (formerly X3D). I just found out we have > returned it because it worked so poorly. I'd be curious what > make/model you have. Also have you tried any normal flat panels with > fast refresh rates and LCD glasses? > > Tom > ------- End of forwarded message -------

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Red / blue stereo
by Thomas Goddard 06 Jun '05

06 Jun '05

Steve Ludtke would like red / blue stereo. Tom ------- Start of forwarded message ------- Date: Sat, 4 Jun 2005 02:13:29 -0500 (CDT) From: Steve Ludtke <stevel(a)blake.3dem.bioch.bcm.tmc.edu> Reply-To: sludtke(a)bcm.tmc.edu To: Thomas Goddard <goddard(a)cgl.ucsf.edu> Subject: Chimera Suggestion We've had a minor resurgance of stereo work in the lab recently. We have a couple of SGI's still with the standard shutter-glasses, and a single PC with a CRT and an active stereo capable projector. We tried the Sharp autostereographic monitor, but it works only so-so, and gives me a headache almost instantly. It would be really useful to have simple stereo set up for occasional use on all of the desktop machines in the lab (which have normal LCD panels now). Anyway, I was just wondering if you guys thought about implementing analglyph (red/blue glasses) stereo ? I've done this manually for snapshots using the 'left eye' and 'right eye' mode in chimera to get the separation right, and it works surprisingly well as long as you don't mind sacrificing color. It would be very useful to have this available for interactive use. Any chance ? (it's also very useful for posters, since many people can't do the eye-crossing thing). Just a suggestion :^) - ---------------------------------------------------------------------------- Steven Ludtke, PhD | Baylor College of Medicine sludtke(a)bcm.tmc.edu | Asst. Professor & Co-Director stevel(a)alumni.caltech.edu | National Center For Macromolecular Imaging V: (713)798-9020 | Dept of Biochemistry and Mol. Biol. F: (713)798-1625 | instant messenger: sludtke42 | Those who Do, Are http://ncmi.bcm.tmc.edu/~stevel | The converse also applies ------- End of forwarded message -------

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Selection question in --nogui mode
by Miguel Ortiz Lombardia 26 May '05

26 May '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello. I'm trying to execute this: $chimera --nogui cmd:findselhbonds where the file findselhbonds contains: open 01.pdb select :59-62 hbonds selRestrict any saveFile tmp.bonds In the graphic mode those instructions work as expected, however in the - --nogui mode I get this error: Opening 01.pdb... warning: Ignored bad PDB record found on line 1 warning: Ignored bad PDB record found on line 2 Computed secondary structure assignments (see reply log) Model 0 (01.pdb) appears to be a protein with no secondary structure assignments. Computing assignments for it using the ksdssp algorithm (Kabsch and Sander Define Secondary Structure of Proteins) with an energy cutoff of - -0.5, minimum helix length of 5, and minimum strand length of 4. If these parameters don't produce good results for this structure, you can rerun the algorithm with different settings using the 'compute SS' button in the model panel (under 'infrequent' actions) or via the 'ksdssp' command in the Midas emulator. The model panel will also allow you to save new default parameters. 1 model opened Opened 01.pdb containing 1 model, 632 atoms, and 62 residues Error while processing cmd:forchimera: NameError: global name 'selMode' is not defined (see reply log for Python traceback info) Traceback (most recent call last): File "/usr/local/linux_prg/Chimera/share/__main__.py", line 59, in ? value = chimeraInit.init(sys.argv) File "CHIMERA/share/chimeraInit.py", line 287, in init prefixableType=1) File "CHIMERA/share/chimera/__init__.py", line 1043, in open File "CHIMERA/share/Midas/ChimeraExtension.py", line 17, in func File "CHIMERA/share/Midas/midas_text.py", line 88, in processCommandFile File "CHIMERA/share/Midas/midas_text.py", line 62, in makeCommand File "CHIMERA/share/Midas/midas_text.py", line 1039, in doSelect File "CHIMERA/share/Midas/__init__.py", line 620, in chimeraSelect File "CHIMERA/share/chimera/tkgui.py", line 1604, in selectionOperation NameError: global name 'selMode' is not defined Any clues? Thank you very much! Miguel - -- Miguel Ortiz Lombardía Centro de Investigaciones Oncológicas C/ Melchor Fernández Almagro, 3 28029 Madrid, Spain Tel. +34 912 246 900 Fax. +34 912 246 976 email: miguel.ortiz(a)cnio.es - ----------------------------------------------------------------------- Et ainsi ne pouvant faire que ce qui est juste fût fort, on a fait que ce qui est fort fût juste. Blaise Pascal, Pensées >>> And the boring bits follow... -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFCleiGF6oOrDvhbQIRAi6cAJ415IJkwKrdjmhOofNbff34aEM3OQCeMdHj GNtxhKnI0DVyUDenbeAHOmw= =VDTj -----END PGP SIGNATURE----- **NOTA DE CONFIDENCIALIDAD** Este correo electrónico, y en su caso los ficheros adjuntos, pueden contener información protegida para el uso exclusivo de su destinatario. Se prohíbe la distribución, reproducción o cualquier otro tipo de transmisión por parte de otra persona que no sea el destinatario. Si usted recibe por error este correo, se ruega comunicarlo al remitente y borrar el mensaje recibido. **CONFIDENTIALITY NOTICE** This email communication and any attachments may contain confidential and privileged information for the sole use of the designated recipient named above. Distribution, reproduction or any other use of this transmission by any party other than the intended recipient is prohibited. If you are not the intended recipient please contact the sender and delete all copies.

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Dipole
by Miguel Ortiz Lombardia 18 May '05

18 May '05

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, Maybe a silly question, but I couldn't find anything in the docs. Given one structure pdb and an electrostatic potential calculated by delphi, can Chimera display the resulting dipole as a vector? Thank you very much! Cheers, Miguel - -- Miguel Ortiz Lombardía Centro de Investigaciones Oncológicas C/ Melchor Fernández Almagro, 3 28029 Madrid, Spain Tel. +34 912 246 900 Fax. +34 912 246 976 email: miguel.ortiz(a)cnio.es - ----------------------------------------------------------------------- Et ainsi ne pouvant faire que ce qui est juste fût fort, on a fait que ce qui est fort fût juste. Blaise Pascal, Pensées >>> And the boring bits follow... -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFCi3u+F6oOrDvhbQIRAsvpAJ40rweZtnhVlp3HPYt8sVDODfzEjgCfdAyq efdpkP4wOqyWcrCTT23aJCM= =rxYo -----END PGP SIGNATURE----- **NOTA DE CONFIDENCIALIDAD** Este correo electrónico, y en su caso los ficheros adjuntos, pueden contener información protegida para el uso exclusivo de su destinatario. Se prohíbe la distribución, reproducción o cualquier otro tipo de transmisión por parte de otra persona que no sea el destinatario. Si usted recibe por error este correo, se ruega comunicarlo al remitente y borrar el mensaje recibido. **CONFIDENTIALITY NOTICE** This email communication and any attachments may contain confidential and privileged information for the sole use of the designated recipient named above. Distribution, reproduction or any other use of this transmission by any party other than the intended recipient is prohibited. If you are not the intended recipient please contact the sender and delete all copies.

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Re: [Chimera-users] New 64-bit Linux version of Chimera
by Thomas Goddard 17 May '05

17 May '05

The 64-bit Linux Chimera 1.2123 installer was broken. A packaged file did not have execute permission. The fixed version is on the download page now with the same version number and date. If you got the broken version (by downloading in the past 8 hours), please try again. Sorry for the gaff. Tom

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Draw user specified object
by Reza Khayat 17 May '05

17 May '05

Hi, I was wondering if there is a way to draw a user specified object. For example, draw a cylinder (bond) from vertex x to vertex y. Thank you. Reza rkhayat(a)scripps.edu

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New 64-bit Linux version of Chimera
by Thomas Goddard 17 May '05

17 May '05

A new 64-bit Linux Chimera snapshot (version 1.2123) is available on the Chimera download page. http://www.cgl.ucsf.edu/chimera/download.html Unless you are viewing large data sets (> 1 Gb), we suggest you use 32-bit versions of Chimera on 64-bit Linux systems. 32-bit versions will likely run faster and use less memory. The 32-bit versions are more likely to be compatible with your Linux distribution. We are not yet making regular distributions for 64-bit linux so our 32-bit version will usually be newer. Tom

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Re: [Chimera-users] Exporting VRML of MSMS surfaces
by Thomas Goddard 16 May '05

16 May '05

The VRMLoutput/__init__.py I posted in my previous two emails worked for the newly added MSMS surface output, but was broken for volume contour surfaces. Here is the corrected code. Tom ---- VRMLoutput/__init__.py follows: # ----------------------------------------------------------------------------- # Output displayed _surface models as VRML. # # ----------------------------------------------------------------------------- # def surfaces_as_vrml(surface_models): surf_vrml = ['#VRML V2.0 utf8\n', 'Transform {', ' children ['] import _surface import chimera for m in surface_models: if m.display: if isinstance(m, _surface.Surface_Model): glist = filter(lambda g: g.display, m.surface_groups()) for g in glist: vrml = surface_group_as_vrml(g) surf_vrml.append(vrml) elif isinstance(m, chimera.MSMSModel): vrml = msms_surface_as_vrml(m) surf_vrml.append(vrml) surf_vrml.extend([' ]', '}']) vrml = '\n'.join(surf_vrml) return vrml # ----------------------------------------------------------------------------- # def surface_group_as_vrml(g): vertex_rgba = g.vertex_colors() solid_rgba = g.color() m = g.model() mat = m.material shine = mat.shininess / 128.0 srgb = mat.specular if g.display_style() == g.Solid: v, vi = g.geometry() n = g.normals() ts = g.two_sided_lighting() vrml = surface_vrml(v, vi, n, vertex_rgba, solid_rgba, ts, shine, srgb) else: v, vi = g.edges() # Mesh lighting not supported in VRML97. vrml = mesh_vrml(v, vi, vertex_rgba, solid_rgba) return vrml # ----------------------------------------------------------------------------- # def msms_surface_as_vrml(m): vertex_rgba, solid_rgba, mat, shine, srgb = msms_colors(m) # TODO: Use m.drawMode (Filled, Mesh, Dot) to control vrml style vfloat, vint, tri = m.triangleData() v = vfloat[:,:3] n = vfloat[:,3:6] vi = tri[:,:3] ts = True vrml = surface_vrml(v, vi, n, vertex_rgba, solid_rgba, ts, shine, srgb) return vrml # ----------------------------------------------------------------------------- # def msms_colors(m): if m.colorMode == m.Custom: vertex_rgba = colors_to_rgba(m.customColors) elif m.colorMode == m.ByAtom: vfloat, vint, tri = m.triangleData() alist = m.atomMap() vatoms = map(lambda i: alist[i-1], vint[:,1]) vertex_rgba = colors_to_rgba(map(atom_color, vatoms)) else: vertex_rgba = None mol = m.molecule if mol: c = mol.surfaceColor if c == None: c = mol.color solid_rgba = c.rgba() mat = c.material else: solid_rgba = (1,1,1,1) import chimera mat = chimera.MaterialColor(0,0,0).material shine = mat.shininess / 128.0 srgb = mat.specular return vertex_rgba, solid_rgba, mat, shine, srgb # ----------------------------------------------------------------------------- # def colors_to_rgba(color_list): rgba = map(lambda c: c.rgba(), color_list) import Numeric rgba_f32 = Numeric.array(rgba, Numeric.Float32) return rgba_f32 # ----------------------------------------------------------------------------- # def atom_color(atom): c = atom.surfaceColor if c == None: c = atom.color if c == None: c = atom.molecule.surfaceColor if c == None: c = atom.molecule.color return c # ----------------------------------------------------------------------------- # def surface_vrml(vertices, vertex_indices, vertex_normals, vertex_rgba, solid_rgba, two_sided_lighting, shininess, specular_rgb): vrml_template = \ '''Shape { appearance Appearance { material Material { diffuseColor %s transparency %.3f shininess %.3f specularColor %s } } geometry IndexedFaceSet { coord Coordinate { point [ %s ] } normal Normal { vector [ %s ] } coordIndex [ %s ] %s solid %s } } ''' pts = tuple_string(vertices, '%.6g %.6g %.6g') ns = tuple_string(vertex_normals, '%.6g %.6g %.6g') m = polygon_size(vertex_indices) vi_format = ' '.join(['%d'] * m + ['-1']) ci = tuple_string(vertex_indices, vi_format) if vertex_rgba: clrs = tuple_string(vertex_rgba[:,:3], '%.3f %.3f %.3f') cspec = 'color Color {\n color [\n%s]\n }\n' % clrs else: cspec = '' srgb, trans = material_colors(vertex_rgba, solid_rgba) specular = '%.3f %.3f %.3f' % specular_rgb if two_sided_lighting: solid = 'FALSE' else: solid = 'TRUE' vrml = vrml_template % (srgb, trans, shininess, specular, pts, ns, ci, cspec, solid) return vrml # ----------------------------------------------------------------------------- # VRML does not handle normals for lines. # def mesh_vrml(vertices, vertex_indices, vertex_rgba, solid_rgba): vrml_template = \ '''Shape { appearance Appearance { material Material { emissiveColor %s transparency %.3f } } geometry IndexedLineSet { coord Coordinate { point [ %s ] } coordIndex [ %s ] %s } } ''' pts = tuple_string(vertices, '%.6g %.6g %.6g') m = polygon_size(vertex_indices) vi_format = ' '.join(['%d'] * m + ['-1']) ci = tuple_string(vertex_indices, vi_format) if vertex_rgba: clrs = tuple_string(vertex_rgba[:,:3], '%.3f %.3f %.3f') cspec = 'color Color {\n color [\n%s]\n }\n' % clrs else: cspec = '' srgb, trans = material_colors(vertex_rgba, solid_rgba) vrml = vrml_template % (srgb, trans, pts, ci, cspec) return vrml # ----------------------------------------------------------------------------- # def material_colors(vertex_rgba, solid_rgba): if vertex_rgba: srgb = '0 0 0' trans = 1 - max(vertex_rgba[:,3]) else: srgb = '%.3f %.3f %.3f' % solid_rgba[:3] trans = 1 - solid_rgba[3] return srgb, trans # ----------------------------------------------------------------------------- # def polygon_size(vertex_indices): if vertex_indices: return len(vertex_indices[0]) return 0 # ----------------------------------------------------------------------------- # def tuple_string(tuples, format): tuple_strings = [] for t in tuples: tuple_strings.append(format % tuple(t)) tstring = '\n'.join(tuple_strings) return tstring # ----------------------------------------------------------------------------- # def surface_models(): import chimera import _surface mlist = chimera.openModels.list(modelTypes = [_surface.Surface_Model, chimera.MSMSModel]) return mlist # ----------------------------------------------------------------------------- # def write_surfaces_dialog(): import os.path dir = os.path.dirname(__file__) help_path = os.path.join(dir, 'helpdir', 'vrml_output.html') help_url = 'file://' + help_path filters = (('VRML', ('*.wrl', '*.vrml'), '.vrml'),) import OpenSave od = OpenSave.SaveModeless(title = 'Save Surfaces as VRML', filters = filters, defaultFilter = 0, command = write_surfaces_cb, multiple = 0, help = help_url) od.enter() # ----------------------------------------------------------------------------- # def write_surfaces_cb(okayed, dialog): if okayed: paths = dialog.getPaths() if len(paths) == 1: write_surfaces_as_vrml(paths[0]) # ----------------------------------------------------------------------------- # def write_surfaces_as_vrml(path): mlist = surface_models() vrml = surfaces_as_vrml(mlist) f = open(path, 'w') f.write(vrml) f.close()

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matching scale for different sessions
by jinghua＠ucsd.edu 16 May '05

16 May '05

to our friendly developer, Is there a way to specify the physical size for a view, so that different sized molecule or map is shown at the same physical scale from different sessions. By the way, is there a command to specify the pixel size of the window? the shrink to fit or grow to fit doesn't work well. many thanks! Jinghua <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>< Jinghua Tang, Ph.D. Phone: 858-534-5852(o) 4107 Natural Sciences Bldg, MC-0378 858-597-2056(h) Department of Chemistry & Biochemistry Fax: 858-534-5846 University of California, San Diego E-mail: jinghua(a)ucsd.edu La Jolla, CA 92093-0378 http://cryoem.ucsd.edu/~jinghua <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><

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by Klinkhardt＠em.uni-frankfurt.de 13 May '05

13 May '05

Hello, I have a question concerning the surface resolution of multiscale models. My intention was to create a surface from pdb data, export it as vrml and reimport it in maya for further animation, shading etc. It works quite well (I had to convert the vrml file in ascii with Deep Explorer first) but the problem is, that I do not get a fine surface with all its convexities and sites for binding. This is important for my work because I would like to animate receptor binding and subsequent signaling in maya. I am looking for a fine surface like these MSMS main surface from pdb data. I do not need many copies of single pdb surfaces but I guess I will only get a #real# surface using the multiscale models tool?? I tried to change the surface resolution (the best result was with resolution: 3, threshold atom density 0.00, smoothing factor 0.5 and smoothing interations 2/3) but I was not able to create a really fine surface. Is there any possibility to get a finer surface (like MSMS main surface) for VRML export? If not, do you have an idea if there are other tools to do that? It would be rally great if you could give me a short reply. Thanks a lot in advance (and sorry for my english...). Best regards Ute

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Scale bar in Chimera
by Haixiao Gao 09 May '05

09 May '05

Hi, I have a problem with the "scale bar" option in Chimera. I was trying to show the scale bar together with a EM density map in spider/brix format. Howerver, it seems that when I changed zoom in/out position, the size change of the "scale bar" is not proportional to the size change of the density map? My chimera version is win32, bata version from 12/15/2004. Thanks for the help! -Haixiao

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Re: [Chimera-users] os x tiger
by Thomas Goddard 05 May '05

05 May '05

We've put code in the Chimera 1.2121 snapshot (released May 5, 2005) to work around a bug in the Apple OpenGL driver that caused Chimera to crash when displaying molecule ribbons. You need to use Chimera 1.2121 or later on Mac OS 10.4. Tom

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beta version of Sequence.py
by Bryan W. Lepore 05 May '05

05 May '05

i'm trying out the secondary structure matching stuff that Eric wrote, and i'm wondering if there is a updated Sequence.py package (that has the StructureSequence functions)? b/c the new MatchMaker/__init__.py trys to import StructureSequence, but its not in chimera/Sequence.py. -bryan

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os x tiger
by Grant Geske 04 May '05

04 May '05

has anyone tried running chimera on the new mac os tiger?? i did and it did not work. does anyone have any suggestions?? grant ________________________________ Grant Geske Blackwell Group University of Wisconsin-Chemistry 1101 University Ave Madison, WI 53706 PH: 608-262-9043 email: chemg(a)mac.com

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circular permuation
by Bryan W. Lepore 04 May '05

04 May '05

i want to test my understanding about the "circular permuation" during matching: is this for proteins that result from gene duplication? -bryan

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Fwd: [Chimera-users] writing alignment
by Elaine Meng 04 May '05

04 May '05

Begin forwarded message: > From: Elaine Meng <meng(a)cgl.ucsf.edu> > Date: Wed May 4, 2005 1:56:54 PM US/Pacific > To: "Bryan W. Lepore" <lepore(a)brandeis.edu> > Subject: Re: [Chimera-users] writing alignment > > > On Wednesday, May 4, 2005, at 01:41 PM, Bryan W. Lepore wrote: >> however i'd like to ask if mmaker is in fact not written to handle >> specific stretches of a model - e.g you can do #1:.a at the least? >> e.g., not something like #1:.a1-10,a15-20... to prune out areas to >> ignore. >> >> -bryan >> > > Hi Brian, > You can specify which chains (like in that example you included > in a previous mail) to construct an alignment with, but not > subparts of those chains. > > However, remember that the structure matching will only use > residues that are actually aligned in the initial sequence alignment. > So, it doesn't matter if the sequences have other parts > that are essentially unalignable. > Elaine >

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mmaker
by Bryan W. Lepore 03 May '05

03 May '05

i'm confused about the command "mmaker". `chimera --nogui mmaker` causes a "no such file or directory" error, so i tried `chimera --nogui --mmaker` which isnt' right either. also tried just `mmaker` even though its not in bin/ lib/. so do i make a heredoc script? i suspect i am missing a fundamental point (that i didn't find with `google: mmaker site:www.cgl.ucsf.edu/chimera`) i've tried both the latest official release and the lastest snapshot. -bryan

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by Ihms, Elihu C 02 May '05

02 May '05

I noted that Apple still has X11 availible for download, just that it's not publicized. http://a1408.g.akamai.net/7/1408/1388/20030317/akamai.info.apple.com/X11/us… Keep up the good work on Chimera! -- Elihu Ihms [ ihms(a)tamu.edu ]

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Chimera Surface Area/Volume
by Elaine Meng 27 Apr '05

27 Apr '05

Hi Dieter, Just a few add-ons to Tom's reply: Another approach to getting the surface area of the receptor buried by the ligand is to run Surface Area/Volume (a) on the complex of ligand and receptor (must delete water and anything else first). Then use Attribute Calculator to sum the surface areas of the receptor atoms only. (b) after deleting ligand, run it again on the receptor. The total is all from the receptor, so it is not necessary to use Attribute Calculator. Subtract the value from (a) from this value. Tom gave a link to the development documentation, which is slightly ahead of the Chimera version you have. It is almost the same, except that the Tools menu has been reorganized. Probably in the version you have, both Attribute Calculator and Surface Area/Volume are in the Utilities submenu of the Tools menu. To get the documentation that goes with your version, use the Help buttons on those dialogs or open the User's Guide from the Help menu. If you have the latest snapshot (1.2105, March) there is an "Attributes" tutorial (Help... Tutorials). Part 2 has one example of using Surface Area/Volume and Attribute Calculator. Finally, if anything is confusing or hard to find in the documentation, please feel free to complain to me! 8-) Elaine ----- Elaine C. Meng, Ph.D. meng(a)cgl.ucsf.edu UCSF Computer Graphics Lab and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco http://www.cgl.ucsf.edu/home/meng/index.html

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buried surface area
by Thomas Goddard 27 Apr '05

27 Apr '05

Hi Dieter, The surface area / volume tool (menu entry Tools -> Utilities -> Surface Area / Volume) could give buried surface areas if you ran it for the unbound receptor, unbound ligand, and then the complex, and then calculated { Area(receptor) + Area(ligand) - Area(receptor+ligand) } / 2 When you use this tool it reports the total area to the Reply Log (menu entry Favorites / Reply Log) and atoms are assigned an attribute saying how much area they contribute. It is a bit of a pain to run it 3 times and do the math yourself. The surface area is calculated by a web server as described in the Chimera User's Guide http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/surfvol/surfvol.ht… so you will need an internet connection to use it. The Chimera User's Guide is only available in HTML as far as I know. It is written in HTML. Tom > From: "Dieter Blaas" <dieter.blaas(a)meduniwien.ac.at> > To: Thomas Goddard <goddard(a)cgl.ucsf.edu> > Date: Wed, 27 Apr 2005 21:38:46 +0200 > Subject: buried surface area > > Hi Tom, > two quick questions: 1/ can Chimera calculate/display > the surface area buried by e.g. a ligand when bound on > a receptor? 2/ is there a documentation other than htlm > (e.g. pdf file)? > Thanx, Dieter >

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Resize a molecule
by Thomas Goddard 27 Apr '05

27 Apr '05

Here is some code to scale a molecule size by a given factor. That is all atoms have their coordinates multiplied by a factor. Tom ------- Start of forwarded message ------- Date: Wed, 27 Apr 2005 11:05:55 -0700 (PDT) From: Thomas Goddard <goddard(a)cgl.ucsf.edu> Hi Jinghua, By "virus cage pdb file" I guess you mean you placed atoms at icosahedral positions, and want to show them connected up to show some icosahedral pattern. I think the easiest approach is to open your old session, run a command to change the diameter of the cage, then save a new session. Below is some Python code that provides a "scalemol" Chimera command. Make a directory chimera/share/scalemol in your Chimera distribution and put the code below in file chimera/share/scalemol/ChimeraExtension.py. Then start Chimera, open the cage PDB model, use menu entry Favorites/Command line, and type a command: scalemol 0 1.5 to make model number 0 bigger by a factor of 1.5. If you have more than one model open you can see the model numbers using Favorites / Model Panel, the model number is shown in the left hand column. Tom - ---- scalemol/ChimeraExtension.py code follows: # ----------------------------------------------------------------------------- # def scale_molecule(cmdname, args): from Midas.midas_text import error fields = args.split() try: model_num = int(fields[0]) factor = float(fields[1]) except: error('Syntax error: scalemol <model-number> <factor>') return import chimera mlist = chimera.openModels.list(id = model_num) if len(mlist) == 0: error('scalemol: No model number %d' % model_num) return for model in mlist: for a in model.atoms: x, y, z = a.coord().xyz.data() c = chimera.Coord() c.x, c.y, c.z = (factor*x, factor*y, factor*z) a.setCoord(c) # ----------------------------------------------------------------------------- # import Midas.midas_text Midas.midas_text.addCommand('scalemol', scale_molecule) ------- End of forwarded message -------

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get to lighting adjustment
by jinghua＠ucsd.edu 26 Apr '05

26 Apr '05

to whom it may concern, How could I get to the adcanced feature of lighting adjustment? Can I add more lights with different directions? Thanks! Jinghua <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>>< Jinghua Tang, Ph.D. Phone: 858-534-5852(o) 4107 Natural Sciences Bldg, MC-0378 858-597-2056(h) Department of Chemistry & Biochemistry Fax: 858-534-5846 University of California, San Diego E-mail: jinghua(a)ucsd.edu La Jolla, CA 92093-0378 http://jinghua.ucsd.edu <<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><<>><

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