Probing the evolutionary conserved regions within functional site of drug-resistant target proteins of Staphylococcus aureus: In silico phylogenetic motif profiling approach.
Staphylococcus aureus is one of the major causes of clinical infections and increasing mortality due to multi-drug resistance. In this study, eight drug-resistant genes, beta-lactamase, metallo-beta-lactamase, vanB, mecA, norA, qacA, qacB and qacC of S. aureus strain Mu50 (vancomycin resistant) were studied to predict the evolutionary conserved functional site residues in their protein sequences. It was found that in beta-lactamase, Tyr, Gly, Thr, Asn and in metallo-beta-lactamase, Thr, His, Gly, Leu, Arg and Asp residues were highly conserved. In vanB, Gly, His and Asp residues were highly conserved. Whereas in mecA, His, Val, Phe, Gln, Lys and in norA, Ser, Leu and Ala residues showed conservedness at moderate level. In the multi-drug efflux pump (corresponding to qacA, qacB and qacC), Gly residue was found to be highly conserved. The homology clustering of target proteins through SCI-PHY algorithm and homologues identified through PSI-BLAST were compared to identify the degree of conservation of functional residues. The phylogenetic motifs identified using homologues of target proteins were validated through domain search to locate their site and functionality in the protein sequences. Interactome analysis was performed to understand the possible mode of interaction of target proteins with their functional partners.
Biotechnology Division, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow 226015, India. amangenomics@gmail.com
Amandeep Kaur
AK
Kahlon
Mahendra P
MP
Darokar
Ashok
A
Sharma
D020816:Amino Acid Motifs; D001426:Bacterial Proteins / Q000737:chemistry / Q000378:metabolism*; D003198:Computer Simulation; D017124:Conserved Sequence; D018432:Drug Resistance, Multiple; D019143:Evolution, Molecular; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism*; D010802:Phylogeny; D054730:Protein Interaction Domains and Motifs; D013211:Staphylococcus aureus / Q000378:metabolism*
D001426:Bacterial Proteins; D010446:Peptide Fragments