pasteur.fr/TubercuList/[11] using Align two sequences (bl2seq) of BLAST http://blast.ncbi.nlm.nih.gov/Blast.cgi[32]. The SNPs obtained by the sequence analysis were used to screen other 100 clinical isolates through Sequenom MassARRAY system. All the SNPs were analysed further for the change in amino acids in the corresponding protein sequences through Gene Runner software version 3.05 (Hastings Software, Inc.) available at http://www.generunner.net. Computational methods Structure homology-based method (PolyPhen) to predict functional
and structural changes in proteins In order selleck chemicals to analyze the learn more impact of nonsynonymous SNPs on the structure and function of proteins of mce operons, Polyphen server http://genetics.bwh.harvard.edu/pph/[33] was used. Protein sequences in FASTA format with the position of amino acid variants indicated were submitted as the query. Polyphen server calculates position- specific independent counts (PSIC) scores for each of the two variants
based on the parameters such as sequence-based characterization of the substitution site, profile analysis of homologous sequences, and mapping of the substitution site to a known protein’s three dimensional structure and then the difference between the PSIC scores of the two variants are computed. find more The higher the PSIC score (> 1.5) difference, the higher the functional impact a particular amino acid substitution
is likely to have. Neural network-based sequence information method (PMut) to predict pathological character of nonsynonymous SNPs PMut server http://mmb2.pcb.ub.es:8080/PMut/[34] was used to predict pathological relevance of nonsynonymous SNPs in the mce operon proteins. The software uses different kinds of sequence information to label mutations from the databases of disease-associated mutations (DAMU), and neural networks (NNs) to process the databases of DAMUs and neutral mutations (NEMUs). The resulting vector of properties is then utilized to decide whether the mutation is pathological or not. Dichloromethane dehalogenase Although, PMut is designed to analyze pathological character associated with mutations in the human proteins. A number of workers [35, 36] have qualitatively interpreted the functionality of mutated non-human proteins especially that of microbes. We submitted the protein sequences as the query, the location of the mutation and the amino acid residues were also furnished. Small NN (20 nodes, 1 hidden layer) with using 2/3 input parameters (pam40 matrix index, pssm index, variability index) was used to train the database as it is recommended for predictions of non-human proteins [34]. NN output greater than 0.5 is predicted as pathological otherwise neutral.