Hi Amy,
I tried and it gave me these errors.
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Error: Could not find bond parameter for: C - NT
Checking for angle parameters.
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
Error: Could not find angle parameter: O - C - NT
Error: Could not find angle parameter: C - NT - H
Error: Could not find angle parameter: C - NT - CT
Error: Could not find angle parameter: XC - C - NT
However, I know that for using the CIF file for CGU from protein databank the main chain file should be this with a charge of -2
>HEAD_NAME N
TAIL_NAME C
MAIN_CHAIN CA
OMIT_NAME H2
OMIT_NAME OXT
OMIT_NAME HXT
OMIT_NAME HE12
OMIT_NAME HE22
PRE_HEAD_TYPE C
POST_TAIL_TYPE N
CHARGE -2.0
However, in my protein structure where I modified the CGU using CHARMM-GUI the atom types seem to be different. In this case what should I do? I have attached my PDB structure file in this email.
Thank you so much,
Jul
________________________________
From: He, Amy <he.1768.buckeyemail.osu.edu>
Sent: Sunday, June 9, 2024 1:14 PM
To: Kavinda Kashi Juliyan Gunasinghe <kkgunasinghe.swinburne.edu.my>; AMBER Mailing List <amber.ambermd.org>
Subject: Re: Parameterization Issue
Hi Jul,
Instead of making one, you could download a component cif file from the corresponding PDB entry for CGU:
https://www.rcsb.org/ligand/CGU
If your residue is embedded (linking two other residues through the backbone), you might have to make your own mainchain file. Tutorial 5 Section 3 does a great demonstration for that:
https://ambermd.org/tutorials/basic/tutorial5/index.php
If you need to modify the protonation state, you could edit the composition and specify the total charge of the residue to your liking, also in the mainchain file.
From: Kavinda Kashi Juliyan Gunasinghe via AMBER <amber.ambermd.org>
Date: Saturday, June 8, 2024 at 10:19 PM
To: AMBER Mailing List <amber.ambermd.org>
Subject: [AMBER] Parameterization Issue
Dear AMBER users,
I have modelled an AF3 protein strucutre which consists of Gamma-carboxylated Glus (CGU). However, I have an issue with generating the Main Chain file for the which gives me several errors that in which several bond and angle parameters are missing. Can I know how I can generate the correct CIF file and then generate the correct main chain file for this protein? I have attached my protein structure in this email.
Thank you inadvance!
Jul
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Received on Sun Jun 09 2024 - 01:30:02 PDT
