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Match showmatrix true motion in original coordinates
by Ahmad Khalifa 13 Aug '19

13 Aug '19

Hi, Running match showmatrix true, gives two matrices. What's the difference between the two? I already saved the file after fitting it so it should have only one set of coordinates, its original coordinates?! Regards Motion of #76 in #2 coordinate system Matrix rotation and translation 0.99998889 -0.00169318 0.00440013 -1.57825672 0.00165962 0.99996960 0.00761849 -4.96792547 -0.00441290 -0.00761111 0.99996130 169.74075587 Axis -0.85023004 0.49200930 0.18717833 Axis point 0.00000000 21533.64775327 2718.66675667 Rotation angle (degrees) 0.51315730 Shift along axis 30.66940614 Motion of #76 original coordinates in #2 coordinate system Matrix rotation and translation 0.78916125 0.61416829 0.00467203 -143.02960322 -0.61417583 0.78916918 0.00023085 242.10381668 -0.00354524 -0.00305162 0.99998906 98.04867640 Axis -0.00267220 0.00668954 -0.99997405 Axis point 281.92931592 330.08522286 0.00000000 Rotation angle (degrees) 37.89294229 Shift along axis -96.04436567

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Chimera bug report submission
by Tanara Arenhart 12 Aug '19

12 Aug '19

The following bug report has been submitted: Platform: Windows64 (WGL) Microsoft Windows Unknown 10.0 (Build 17134) x64 Chimera Version: 1.13.1_b41965 Description Hi! I'm trying to dock my protein with a ligand, but everytime appears this message: "receptor and ligand cannot be the same model". I don't know why, because i'm doing the same things I always do. What could be happening? Thank you! Open models #0 3dbs.pdb #1 smiles:CC1CCC2C3(CCC(... #2 AutoDock Vina Search Volume Reply log: Failed to translate SMILES to 3D structure via NCI web service (SMILES: receptor and ligand cannot be the same model) Failed to translate SMILES to 3D structure via Indiana University web service (SMILES: receptor and ligand cannot be the same model) Web services failed to translate SMILES string to 3D structure. Translated SMILES to 3D structure via NCI web service (SMILES: CC1CCC2C3(CCC(C(C3CCC2(C14CC5=C(O4)C(=CC(=O)C5=O)C)C)(C)C)O)C) No incomplete side chains Chain-initial residues that are actual N terminii: Chain-initial residues that are not actual N terminii: Chain-final residues that are actual C terminii: Chain-final residues that are not actual C terminii: 0 hydrogen bonds Hydrogens added Charge model: AMBER ff14SB Assigning partial charges to residue STP (net charge +0) with gasteiger method Running ANTECHAMBER command: C:/Program Files/Chimera 1.13.1/bin/amber16/bin\antechamber -i c:\users\nara_\appdata\local\temp\tmpi9opye\ante.in.mol2 -fi mol2 -o c:\users\nara_\appdata\local\temp\tmpi9opye\ante.out.mol2 -fo mol2 -c gas -nc 0 -j 5 -s 2 -dr n (STP) (STP) Welcome to antechamber 17.3: molecular input file processor. (STP) (STP) Info: Finished reading file (c:\users\nara_\appdata\local\temp\tmpi9opye\ante.in.mol2). (STP) Running: "C:/Program Files/Chimera 1.13.1/bin/amber16/bin/bondtype" -j part -i ANTECHAMBER_BOND_TYPE.AC0 -o ANTECHAMBER_BOND_TYPE.AC -f ac (STP) (STP) (STP) Running: "C:/Program Files/Chimera 1.13.1/bin/amber16/bin/atomtype" -i ANTECHAMBER_AC.AC0 -o ANTECHAMBER_AC.AC -p gaff (STP) Running: "C:/Program Files/Chimera 1.13.1/bin/amber16/bin/atomtype" -i ANTECHAMBER_GAS.AC -o ANTECHAMBER_GAS_AT.AC -d "C:/Program Files/Chimera 1.13.1/bin/amber16/dat/antechamber/ATOMTYPE_GAS.DEF" (STP) Charges for residue STP determined Total charge for #0: 0.000 #0, chain A: phosphatidylinositol-4,5-bisphosphate 3-kinase catalytic subunit γ isoform Traceback (most recent call last): File "C:\Program Files\Chimera 1.13.1\share\chimera\preferences\base.py", line 447, in save WindowsError: [Error 32] O arquivo j� est� sendo usado por outro processo Cannot replace previous preferences file: C:\Users\nara_\AppData\Roaming\.chimera\preferences: WindowsError: [Error 32] O arquivo j� est� sendo usado por outro processo File "C:\Program Files\Chimera 1.13.1\share\chimera\preferences\base.py", line 447, in save See reply log for Python traceback. Residues with incomplete side chains: MET 143.A GLU 322.A Replacing each by 'swapaa same (residue atom spec) lib Dunbrack preserve True' MET 143.A: phi none, psi -122.2 trans Chi angles for MET 143.A: GLU 322.A: phi -130.9, psi 172.4 trans Chi angles for GLU 322.A: Applying GLU rotamer (chi angles: -62.4 -179.4 -3.8) to GLU 322.A Applying MET rotamer (chi angles: -65.8 -61.8 -69.4) to MET 143.A Terminii for 3dbs.pdb (#0) chain A determined from SEQRES records Chain-initial residues that are actual N terminii: MET 143.A Chain-initial residues that are not actual N terminii: GLU 267.A, CYS 357.A, LEU 460.A, PHE 497.A, HIS 525.A, ARG 544.A, GLU 981.A Chain-final residues that are actual C terminii: Chain-final residues that are not actual C terminii: ALA 253.A, GLU 322.A, CYS 435.A, GLY 489.A, ASN 522.A, ALA 528.A, HIS 967.A, VAL 1091.A 718 hydrogen bonds Adding 'H' to GLU 267.A Adding 'H' to CYS 357.A Adding 'H' to LEU 460.A Adding 'H' to PHE 497.A Adding 'H' to HIS 525.A Adding 'H' to ARG 544.A Adding 'H' to GLU 981.A Removing spurious proton from 'C' of VAL 1091.A Hydrogens added Charge model: AMBER ff14SB Total charge for #0: -8.000 receptor and ligand cannot be the same model receptor and ligand cannot be the same model OpenGL Vendor: Intel OpenGL Renderer: Intel(R) HD Graphics OpenGL Version: 4.4.0 - Build 20.19.15.4835 Manufacturer: Dell Inc. Model: Inspiron 5452 TotalPhysicalMemory: 4203823104 ―――――――――――――――――――― Multisampling: False Shadows: False Shadow texture size: 2048 Silhouettes: False Depth cue: True Subdivision quality: 1.50 Single-layer transparency: True Transparent background: False Shaders supported: True Using shader: True Window size: 1366 663 Camera mode: mono Orthographic projection: False Center of rotation: front center Near/far clipping: False Key light: True Fill light: True Back light: False Ambient light: 0.20 Specular sharpness: 30.00 Specular reflectivity: 1.00 ―――――――――――――――――――― AntialiasLines: native AntialiasPoints: native BlendEquation: native BlendFuncSeparate: native BrokenAttribLocation: native, disabled ChoosePixelFormat: extension ColorTable: not supported CompileAndExecute: native CompiledVertexArray: extension CubeMap: native CullVertex: not supported DrawElementsInstanced: native, disabled DrawRangeElements: native FBConfig: not supported FBOShadows: native FastMultisampling: native, disabled FramebufferMultisample: native FramebufferObject: native LimitVertexAttribDivisor: native, disabled Multisample: native Multitexture: native PackedDepthStencil: native PalettedTexture: not supported PointParameters: native SeamlessCubeMap: native SeparateSpecularColor: native Shading: native Shadows: native StereoMultisample: native StereoRubberBanding: native Texture3D: native TextureColorTable: not supported TextureEdgeClamp: native TrustColorLogicBlend: native TrustNormals: native VertexArray: native VertexAttrib: native VertexAttribDivisor: native VertexBufferObject: native, disabled WindowPos: not supported

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A question about the Volume Viewer
by Grosman, Claudio F 09 Aug '19

09 Aug '19

Hello everyone, I have (what I think is) a very simple question: what is the particular value of "level" (that is, the threshold) that appears automatically when one opens a 3D density map? After playing around with the threshold, I always feel like the initial value is the best one, but I wonder what exactly this value is. In the online documentation of Chimera, this issue is addressed. The text reads that the initial value of this threshold is such that 1% of the voxels have density values above it. Is this really the case? Only voxels with intensities above the threshold are displayed. Am I seeing only 1% of the voxels, then? I am afraid, I am confused. Thank you very much, in advance. Claudio

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Selecting one ID 0 when two ID 0s are present
by Ryan Harlich 09 Aug '19

09 Aug '19

Hi Chimera, I have a problem where there are two ID 0. One is the normal density map the other is a solid (or what seems to be a movie of the protein). I want to select the density map. In the GUI interface I would open volume viewer and select radio button surface for category Style. Then a little below select All instead of One. I was wondering how to do this with command line? What I am trying to do is get a chain of the pdb structure and zone the density map. However the files are really big so I am trying to do it via ssh on another computer so I will be doing it with the –nogui flag. So if I can do everything via command line that would be great. Best, Ryan Harlich Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Double chain IDs
by Albert WEIXLBAUMER 08 Aug '19

08 Aug '19

Dear Chimera developers, My apologies if this question has been asked before but I was not able to find an answer so far. I am dealing with PDB files that contain too many individual chains and as such need two-character chain IDs. Ideally I do not want to split the PDB-files (to be able and work with single-character chain IDs). In addition, the PDB-file also contains more than 100,000 atoms and thus uses alphanumeric atom numbers. It seems Chimera is not aware of the two-character chain IDs because selecting a certain chain in the GUI shows only single character chain IDs and it leads to the selection of the two distinct chains (e.g. chain AA and chain BA are both treated as chain A). Is there a workaround? I’ve also noticed that saving such a PDB-file in Chimera changes all ATOM records to HETATM - I don’t know if this is related to the double-character chain IDs or alphanumeric atom numbers but this causes problems downstream because it’s very difficult to change this back to ATOM records without also affecting true HETATM entries. Thank you for your help! Best regards, Albert -- Albert Weixlbaumer Centre for Integrative Biology Department of Integrated Structural Biology Institute of Genetics and Molecular and Cellular Biology IGBMC - UMR 7104 - U 1258 1, rue Laurent Fries BP 10142 67404 ILLKIRCH CEDEX FRANCE Phone: +33 3 6948 5103 Email: Albert.Weixlbaumer(a)igbmc.fr<mailto:Albert.Weixlbaumer@igbmc.fr> OpenPGP KeyID: 0x7F644168

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Making PDBs with over 10,000 atoms
by Ryan Harlich 07 Aug '19

07 Aug '19

Hi Chimera, I am trying to make a PDB with over 10,000 atoms. Currently we have this marked as a limitation to our project. I am researching to see if there is a way around this. Our current idea is to make the next 10,000 atoms another chain. Although when I apply this to a sample I get a break point between chain A and chain B. I do want them connected and to be different chains. So: 9,998.A 9,999.A 0.B 1.B connect. In addition, I would need helices and sheets to span over these two chains. So helix or sheet would start at 9,998.A and end at 1.B. Best, Ryan Harlich Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Superimpose protein chains
by Peter Snyder 07 Aug '19

07 Aug '19

How can I superimpose two (or three) chains from a single structure (ie two homologous subunits that form a multimeric protein)? Thank you Pete

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Is "volume #0 voxelSize 1" a isosurface display changes
by Ryan Harlich 06 Aug '19

06 Aug '19

Hi Chimera, Is "volume #0 voxelSize 1" a isosurface display changes? So if I volume save this would it save this change? Best, Ryan Harlich Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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Morphing, ligands, and secondary structure
by Yan Kung 06 Aug '19

06 Aug '19

Hi Chimera, I’m a new-ish user, and I’ve found that morphing structures is usually very straightforward and easy to use. But I’m now running into an issue with morphing and ligands (and secondary structure). I’d like to make a single morph composed of states A-B-C-B-A (so 4 movements between 5 states). These movements are: (1) A-B: domain opens, (2) B-C: a ligand flies out, (3) C-B: the same ligand flies back in, and (4) B-A: domain closes. First problem: the ligand does not appear in the resulting morph, a problem suggested by the documentation, which I have tried (and failed) to solve using the tips I found in archived posts from this mailing list. Also, because the ligand has to fly in and out, I can’t simply superimpose the ligand from any of the individual states over the morph. So I tried a workaround: make each movement a separate morph. This works for movements 2 and 3 (where the ligand flies out and in). But the ligand still does not appear in movements 1 and 4 (where the ligand remains in place and the domain moves). I’m not sure why the ligand’s appearance would depend on whether it flies in/out, or whether a domain moves… But it seems to. Moreover, a second problem emerges that has to do with secondary structure and is difficult to explain. (Essentially: a few protein regions are on the border between helices and loops such that they appear as helices in some states but as loops in others, and vice versa. If possible, I’d like the secondary structure to remain constant across all states, or else it’s distracting. Even still, I’ve tried to embrace this and use ksdssp to show the helices/loop switching back and forth, but this is distracting as they flicker between helices and loops, each region at its own separate frame. Specifying ksdssp only in certain frames to minimize the flickering doesn’t work either, as different regions switch back and forth at different times.) The only solution I can think of that would maintain the same secondary structure throughout is to just make a single morph of all movements (and not use ksdssp). But this puts me back where I started! Any ideas? (Separately, I realize that I could make a simpler morph of just A-B-C, then record it as “roundtrip”, i.e. forward and backwards, to achieve the same thing as A-B-C-B-A. But this doesn’t solve the problems above.) Thanks very much, Yan -- Yan Kung Assistant Professor Department of Chemistry Bryn Mawr College http://www.brynmawr.edu/people/yan-kung Follow: @KungLab<https://twitter.com/KungLab>

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Nvidia 3D Vision on a large display
by Tom Goddard 02 Aug '19

02 Aug '19

Krish Raman asked what kind of large displays might work with Nvidia 3D Vision stereo glasses with Chimera. Hi Krish, I believe any display capable of a high refresh rate, at least 120 Hz (even 100Hz would do) will be able to show stereo with Nvidia 3D vision. Conventional 60 Hz displays could only show stereo at 30 Hz in each eye (since the display first shows the left eye, then shows the right eye in sequence), and 30 Hz is too slow causing flicker. Video gaming displays are usually advertised as 144 Hz and I believe any of those would work. It is hard to find big displays at 144 Hz, but here is an example, 49 inch ultra wide Samsung CHG90 https://www.amazon.com/Samsung-49-Inch-Curved-Monitor-LC49HG90DMNXZA/dp/B07… <https://www.amazon.com/Samsung-49-Inch-Curved-Monitor-LC49HG90DMNXZA/dp/B07…> If one person is using this sitting at a desk it is very wide and would probably give very nice immersive stereo because of the width. It is not ideal for your use with an audience standing further back because of its extreme 32:0 aspect ratio. You could look for a video gaming TV, such as these https://www.tomsguide.com/us/best-4k-gaming-tv,review-4837.html <https://www.tomsguide.com/us/best-4k-gaming-tv,review-4837.html> Keep in mind your Nvidia 3DVision system may not work with any of these. I would strongly recommend testing at a store with your 3DVision before buying. Stereo is an an extremely obscure niche product and there is no telling if it will work without testing. Another option is to use a high refresh rate projector. That is what we use at my lab -- (ours is a $50,000 Christie, so I don't recommend it). Also I am sure you are aware that Nvidia discontinued support for 3D Vision and it will not work with any Nvidia drivers released after April 2019. So the 3D Vision system is going to be dead soon. Tom

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