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• W2070512312 startingPage "140" @default.
• W2070512312 abstract "Members of the small multidrug resistance (SMR) protein family are integral membrane proteins characterized by four alpha-helical transmembrane strands that confer resistance to a broad range of antiseptics and lipophilic quaternary ammonium compounds (QAC) in bacteria. Due to their short length and broad substrate profile, SMR proteins are suggested to be the progenitors for larger alpha-helical transporters such as the major facilitator superfamily (MFS) and drug/metabolite transporter (DMT) superfamily. To explore their evolutionary association with larger multidrug transporters, an extensive bioinformatics analysis of SMR sequences (> 300 Bacteria taxa) was performed to expand upon previous evolutionary studies of the SMR protein family and its origins.A thorough annotation of unidentified/putative SMR sequences was performed placing sequences into each of the three SMR protein subclass designations, namely small multidrug proteins (SMP), suppressor of groEL mutations (SUG), and paired small multidrug resistance (PSMR) using protein alignments and phylogenetic analysis. Examination of SMR subclass distribution within Bacteria and Archaea taxa identified specific Bacterial classes that uniquely encode for particular SMR subclass members. The extent of selective pressure acting upon each SMR subclass was determined by calculating the rate of synonymous to non-synonymous nucleotide substitutions using Syn-SCAN analysis. SUG and SMP subclasses are maintained under moderate selection pressure in comparison to integron and plasmid encoded SMR homologues. Conversely, PSMR sequences are maintained under lower levels of selection pressure, where one of the two PSMR pairs diverges in sequence more rapidly than the other. SMR genomic loci surveys identified potential SMR efflux substrates based on its gene association to putative operons that encode for genes regulating amino acid biogenesis and QAC-like metabolites. SMR subclass protein transmembrane domain alignments to Bacterial/Archaeal transporters (BAT), DMT, and MFS sequences supports SMR participation in multidrug transport evolution by identifying common TM domains.Based on this study, PSMR sequences originated recently within both SUG and SMP clades through gene duplication events and it appears that SMR members may be evolving towards specific metabolite transport." @default.
• W2070512312 created "2016-06-24" @default.
• W2070512312 creator A5055483621 @default.
• W2070512312 creator A5076324446 @default.
• W2070512312 date "2009-01-01" @default.
• W2070512312 modified "2023-10-01" @default.
• W2070512312 title "Diversity and evolution of the small multidrug resistance protein family" @default.
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• W2070512312 doi "https://doi.org/10.1186/1471-2148-9-140" @default.
• W2070512312 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2716321" @default.
• W2070512312 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19549332" @default.
• W2070512312 hasPublicationYear "2009" @default.
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