October 2015 - Chimera-users - RBVI Mailing Lists

Announcing the 2015/2016 EMDataBank Model Challenge
by Cathy Lawson 14 Oct '15

14 Oct '15

Dear Chimera User List Members, EMDataBank is pleased to announce the 2015/2016 Model Challenge. All members of the Scientific Community--at all levels of experience--are invited to participate as Challengers, and/or as Assessors. Benchmark targets of varying size and complexity have been selected from recently deposited 3DEM structures based on current state-of-the-art detectors and processing methods, in the resolution range 2.2-4.5 Å. Challengers are sought to create and validate models from challenge target maps in four different categories (1. optimize current cryoEM model, 2. fit known related cryoEM, crystallographic, or comparative models, 3. ab initio model building, 4. any other method of map interpretation), and upload their results with associated details. Assessors are sought to participate in evaluating submitted models. Registration is now open for all interested participants. Challengers may submit their models between November and April. Before submissions open, all are encouraged to provide feedback on submission requirements. An open assessment period will commence in late 2016. To learn more about this challenge and to register, please visit http://challenges.emdatabank.org and click on "MODEL CHALLENGE" in the menu bar. This is the second of two community-wide challenges being sponsored by EMDataBank this year to critically evaluate 3DEM methods that are coming into use, with the ultimate goal of developing validation criteria associated with every 3DEM map and map-derived model. The first challenge is focused on creating reconstructions from raw 2D image data and is currently in progress (click on "MAP CHALLENGE" in the menu bar). Sincerely, Cathy Lawson on behalf of the EMDataBank Team and the Model Challenge Committee emdatabank.org www.facebook.com/emdatabank3dem

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Show symmetry axis?
by Oliver Clarke 14 Oct '15

14 Oct '15

Hi all, Is there any way to easily generate an axis (of the type created by define axis, not a BILD file) corresponding to the z-axis of a map? Or of the symmetry axis of a map as identified by measure symmetry (which should be the same thing I guess)? I would like to be able to align Cn symmetric maps, which in general have the Cn symmetry axis coincident with z, while strictly obeying the Cn symmetry of the map. There is no built-in way to do this in chimera that I know of, but if I could create an axis corresponding to z for both maps, I could measure correlation between the two maps about that axis, after first aligning the symmetry axes of the two maps and approximately matching their translations along that axis (incidentally, for the same purpose it would be handy to have an additional option for "measure correlation rotationaxis", to measure correlation in a distance range corresponding to +/- x Å from the current position along the specified axis - angleRange is currently present, “distanceRange” seems like it could be a useful extension). The closest I have come so far is the following alias: alias ^screen_axis cofr view; savepos tmp; ac mc; namesel z1; clip hither -50;clip yon -50;cofr view; ac mc; namesel z2; sel z1 | z2; define axis sel; ~disp sel; reset tmp This will generate an axis perpendicular to and in the center of the screen, but this seems like a bit of a hack… also when I use measure correlation with this axis ("measure correlation #2 #0 rotationAxis a1”, where #2 and #0 are the two maps and the axis is a1), I get the attached error - is this a bug or did I make a stupid mistake somewhere? Cheers, Oliver.

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Show symmetry axis?
by Oliver Clarke 14 Oct '15

14 Oct '15

Actually never mind… just realized I have requested similar previously and there is already a ticket open (http://plato.cgl.ucsf.edu/trac/chimera/ticket/13829 <http://plato.cgl.ucsf.edu/trac/chimera/ticket/13829>). Nevertheless, consider this another vote for constraining fitmap to the symmetry of the input maps (or models) - would be very very helpful when dealing with ion channels. Cheers, Oliver. > > Message: 1 > Date: Tue, 13 Oct 2015 20:13:37 -0400 > From: Oliver Clarke <olibclarke(a)gmail.com> > To: "chimera-users(a)cgl.ucsf.edu BB" <chimera-users(a)cgl.ucsf.edu> > Subject: [Chimera-users] Show symmetry axis? > Message-ID: <5DBFD175-0F48-4731-9E7E-C3F635BC571D(a)gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi all, > > Is there any way to easily generate an axis (of the type created by define axis, not a BILD file) corresponding to the z-axis of a map? Or of the symmetry axis of a map as identified by measure symmetry (which should be the same thing I guess)? > > I would like to be able to align Cn symmetric maps, which in general have the Cn symmetry axis coincident with z, while strictly obeying the Cn symmetry of the map. > > There is no built-in way to do this in chimera that I know of, but if I could create an axis corresponding to z for both maps, I could measure correlation between the two maps about that axis, after first aligning the symmetry axes of the two maps and approximately matching their translations along that axis (incidentally, for the same purpose it would be handy to have an additional option for "measure correlation rotationaxis", to measure correlation in a distance range corresponding to +/- x ? from the current position along the specified axis - angleRange is currently present, ?distanceRange? seems like it could be a useful extension). > > The closest I have come so far is the following alias: > > alias ^screen_axis cofr view; savepos tmp; ac mc; namesel z1; clip hither -50;clip yon -50;cofr view; ac mc; namesel z2; sel z1 | z2; define axis sel; ~disp sel; reset tmp > > This will generate an axis perpendicular to and in the center of the screen, but this seems like a bit of a hack? also when I use measure correlation with this axis ("measure correlation #2 #0 rotationAxis a1?, where #2 and #0 are the two maps and the axis is a1), I get the attached error - is this a bug or did I make a stupid mistake somewhere? > > Cheers, > Oliver. > > > > >

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drawing single stranded dna
by Sanders, Melanie - ARS 13 Oct '15

13 Oct '15

Dear, Is it possible to draw a single stranded dna. I always get a double stranded one if I enter the nucleic acids. Best regards, Melanie Sanders, PhD. Mycotoxin Prevention and Applied Microbiology USDA-ARS 1815 North University Street Peoria, Illinois 61604-3999 Phone: 309-681-6208 e-mail: melanie.sanders(a)ars.usda.gov<mailto:melanie.sanders@ars.usda.gov>

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output hdf5
by gijs 13 Oct '15

13 Oct '15

Dear Sir/Madam. First of all I want to complement the chimera team for writing a fantastic package for view macromolecular complexes. I am a researcher from the coherent X-ray diffraction community and we are also producing 3D models using our software [1]. However, we write data in a hdf5 format. Would you be interested to incorporate our file system into your package, or, and I think this is for now the better solution, could you provide a way I can write my hdf5 file to a chimera readable format and visa versa? For instance, I am trying to open a .map file from the EM databank, but do not know to exactly how to convert it. Are there tools? What file tree in hdf5 do I need? With kind regards, Gijs van der Schot [1] http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.098102

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on 2d label related movie command
by Smith Liu 13 Oct '15

13 Oct '15

Dear All, By chimera is any method we label a residue in a protein after scaling-up around that residue in a movie? Best regards. Smith

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rmsd overlay
by Francesco Pietra 12 Oct '15

12 Oct '15

Hello; Ho to superimpose a fake atom (pdb file available) to a coordiated metal in a protein? I could change the name of the fake atom to that of the metal, but then I need an rmsd overlay. hope it is clear. thanks francesco pietra

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python/model panel
by Dougherty, Matthew T 10 Oct '15

10 Oct '15

I would like to print out the model ID, name and input files as they are listed in the model panel. Can you point me in the direction of how to loop over the model panel ? Such as elevant variables, and what would be a block of code in chimera that I should study. Matthew Dougherty National Center for Macromolecular Imaging Baylor College of Medicine ================================================= =================================================

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Re: [Chimera-users] pipes & planks
by Tom Goddard 09 Oct '15

09 Oct '15

Hi Gabe, I've added a "pipes" command to tonight's Chimera daily build, for example, pipes #0 helixColor pink strandColor salmon and to delete the pipes and planks ~pipes #0 Other command options with default values are: helixColor = None, helixEdgeColor = None, helixArrow = True, helixFixedRadius = True, helixRadius = 1.25, helixSplit = False, helixSplitRatio = 2.5, strandColor = None, strandEdgeColor = None, strandArrow = True, strandFixedWidth = True, strandWidth = 2.5, strandFixedThickness = True, strandThickness = 1.0, strandSplit = False, strandSplitRatio = 2.5, displayCoils = True, displayTurns = True, turnColor = None, turnEdgeColor = None, turnResolution = 10, turnWidth = 0.25, turnThickness = 0.25 Colors by default match the ribbon color, or molecule color. Tom > On Oct 9, 2015, at 1:12 AM, Gabriel Lander wrote: > > Hi Tom, > 2 quick questions: > > 1) is there a way to turn generate a pipes & planks model from the command line? > 2) Can the coils in the pipes & planks be depicted as rounded instead of edged? > > Thanks as always, > -gabe > >

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bootstrap wanted boxsize
by Marlovits,Thomas 09 Oct '15

09 Oct '15

Hi Chimera-developers, I am wondering, whether there is a command to generate a new (empty) volume box from scratch? This would be a great help. Many thanks, -Thomas

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