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Characteristics of Klebsiella pneumoniae harboring QnrB32, Aac(6’)-Ib-cr, GyrA and CTX-M-22 genes

机译:携带QnrB32,Aac(6’)-Ib-cr,GyrA和CTX-M-22基因的肺炎克雷伯菌的特征

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Quinolone resistance in members of the Enterobacteriaceae family is mostly due to mutations in the quinolone resistance-determining regions of topoisomerase genes. CTX-M-22 is a member of the CTX-M family which can reduce extended-spectrum β-lactamase (ESBL) production and modulate antibiotic resistance, resulting in low ceftazidime minimum inhibitory concentrations (MICs). There are four different genes in Klebsiella pneumoniae (KP4707) including qnrB32 (novel qnr allele gene, HQ704413), aac(6’)-Ib-cr (novel aac(6’)-Ib allele gene, HQ680690), gyrA (novel gyrA allele gene, HQ680691) and CTX-M-22 gene. Five point amino acid mutations Arn(N)27 → Leu(L), Val(V)129 → Ala(A), Iie(I)142 → Met(M), Gly(G)188 → Arg(R), Val(V)212 → Iie(I) were observed in the qnr32 gene when compared to qnrB1. Of all qnrB alleles, a novel variant of the qnrB32 gene, with qnrB31, had the highest amino acid homology. Three point amino acid mutations including Trp(W)105 → Arg(R), Asp(D)182 → Tyr(Y) and Val(V)201 → Asp(D) were observed in aac(6’)-Ib-cr gene, when compared to GenBank number AF479774. New variants of qnr32, aac(6’)-Ib-cr, gyrA and CTX-M-22 or other genotype determinants continuously appear in different genomic sites and also outside the Enterobacteriaceae family.
机译:肠杆菌科成员的喹诺酮耐药性主要是由于拓扑异构酶基因的喹诺酮耐药性决定区域发生突变。 CTX-M-22是CTX-M家族的成员,它可以减少广谱β-内酰胺酶(ESBL)的产生并调节抗生素抗性,从而降低头孢他啶的最低抑菌浓度(MICs)。肺炎克雷伯氏菌(KP4707)中有四个不同的基因,包括qnrB32(新的qnr等位基因,HQ704413),aac(6')-Ib-cr(新的aac(6')-Ib等位基因,HQ680690),gyrA(新的gyrA等位基因(HQ680691)和CTX-M-22基因。五点氨基酸突变Arn(N)27→Leu(L),Val(V)129→Ala(A),Iie(I)142→Met(M),Gly(G)188→Arg(R),Val与qnrB1相比,在qnr32基因中观察到(V)212→Iie(I)。在所有qnrB等位基因中,具有qnrB31的qnrB32基因的新变体具有最高的氨基酸同源性。在aac(6')-Ib-cr中观察到三点氨基酸突变,包括Trp(W)105→Arg(R),Asp(D)182→Tyr(Y)和Val(V)201→Asp(D)与GenBank编号AF479774比较。 qnr32,aac(6')-Ib-cr,gyrA和CTX-M-22的新变体或其他基因型决定簇连续出现在不同的基因组位点中,也出现在肠杆菌科之外。

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