Bioinformation

Publication date: 2009-01
Pages: 242 -
ISSN: 0973-2063 PMID: 20975917
DOI: 10.6026/97320630004242
Publisher: Biomedical Informatics Pub. Group

Author:

Sharma, Ravi Datta
Goswami, Nabajyoti ; Lynn, Andrew M ; Rajnee, ; Sharma, Pradeep Kumar ; Jawaid, Safdar

Keywords:

Bacillus anthracis, Homology modeling, amidase-03, hydrolase enzyme, modeller, 0601 Biochemistry and Cell Biology

Abstract:

Homology models of amidase-03 from Bacillus anthracis were constructed using Modeller (9v2). Modeller constructs protein models using an automated approach for comparative protein structure modeling by the satisfaction of spatial restraints. A template structure of Listeria monocytogenes bacteriophage PSA endolysin PlyPSA (PDB ID: 1XOV) was selected from protein databank (PDB) using BLASTp with BLOSUM62 sequence alignment scoring matrix. We generated five models using the Modeller default routine in which initial coordinates are randomized and evaluated by pseudo-energy parameters. The protein models were validated using PROCHECK and energy minimized using the steepest descent method in GROMACS 3.2 (flexible SPC water model in cubic box of size 1 Å instead of rigid SPC model). We used G43a1 force field in GROMACS for energy calculations and the generated structure was subsequently analyzed using the VMD software for stereo-chemistry, atomic clash and misfolding. A detailed analysis of the amidase-03 model structure from Bacillus anthracis will provide insight to the molecular design of suitable inhibitors as drug candidates.