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virulence, detoxification, adaptation
information pathways
cell wall and cell processes
stable RNAs
insertion seqs and phages
intermediary metabolism and respiration
regulatory proteins
conserved hypotheticals
lipid metabolism
General annotation
FunctionInvolved in fatty acid biosynthesis (mycolic acids synthesis); involved in meromycolate extension. Catalyzes the condensation reaction of fatty acid synthesis by the addition to an acyl acceptor of two carbons from malonyl-ACP [catalytic activity: acyl-[acyl-carrier protein] + malonyl-[acyl-carrier protein] = 3-oxoacyl-[acyl-carrier protein] + [acyl-carrier protein] + CO(2)].
Product3-oxoacyl-[acyl-carrier protein] synthase 1 KasA (beta-ketoacyl-ACP synthase) (KAS I)
CommentsRv2245, (MTCY427.26), len: 416 aa. KasA, beta-ketoacyl-ACP synthase, involved in meromycolate extension (see citations below): belongs to the fas-II system, which utilizes primarily palmitoyl-ACP rather than short-chain acyl-ACP primers. Highly similar to others e.g. L43074|STMFABD3|g870805 beta-ketoacyl-ACP synthase from Streptomyces glaucescens (423 aa), FASTA scores: opt: 1105, E(): 0, (44.6% identity in 417 aa overlap); FABF_ECOLI|P39435 3-oxoacyl-[acyl-carrier-protein] synthase II from Escherichia coli, FASTA score: (39.4% identity in 254 aa overlap); FABB_HORVU|P23902 3-oxoacyl-[acyl-carrier-protein] synthase I, FASTA score: (33.4% identity in 413 aa overlap); etc. Strongest similarity to downstream ORF kasB|Rv2246|MTCY427.27 3-oxoacyl-[acyl-carrier-protein] synthase 2 from Mycobacterium tuberculosis (438 aa), FASTA score: (66.3% identity in 409 aa overlap). Belongs to the beta-ketoacyl-ACP synthases family.
Functional categoryLipid metabolism
ProteomicsIdentified in the membrane fraction of M. tuberculosis H37Rv using 1D-SDS-PAGE and uLC-MS/MS (See Gu et al., 2003). Identified in the cell wall and cell membrane fractions of M. tuberculosis H37Rv using 2DLC/MS (See Mawuenyega et al., 2005). Identified by mass spectrometry in Triton X-114 extracts of M. tuberculosis H37Rv (See Malen et al., 2010). Identified by mass spectrometry in M. tuberculosis H37Rv-infected guinea pig lungs at 90 days but not 30 days (See Kruh et al., 2010). Identified by mass spectrometry in the culture filtrate, membrane protein fraction, and whole cell lysates of M. tuberculosis H37Rv (See de Souza et al., 2011).
TranscriptomicsmRNA identified by DNA microarray analysis (gene induced by isoniazid (INH) or ethionamide treatment) (see Wilson et al., 1999). mRNA also identified by other microarray analysis and real-time RT-PCR; transcription up-repressed at low pH in vitro conditions, which may mimic an environmental signal encountered by phagocytosed bacteria (see Fisher et al., 2002). mRNA expression also studied in human lung granulomas of tuberculosis patients (see Fenhalls et al., 2002).
MutantEssential gene for in vitro growth of H37Rv in a MtbYM rich medium, by Himar1 transposon mutagenesis (see Minato et al. 2019). Essential gene for in vitro growth of H37Rv, by analysis of saturated Himar1 transposon libraries (see DeJesus et al. 2017). Essential gene by Himar1 transposon mutagenesis in H37Rv strain (see Sassetti et al., 2003). Essential gene for in vitro growth of H37Rv, by Himar1 transposon mutagenesis (See Griffin et al., 2011).
Check for mutants available at TARGET website
Genomic sequence
Feature type Upstream flanking region (bp) Downstream flanking region (bp) Update
Protein sequence
>Mycobacterium tuberculosis H37Rv|Rv2245|kasA