PBP2a in β-Lactam-Resistant Laboratory Mutants and Clinical Isolates: Disruption Versus Reduced Penicillin Affinity.

PBP2a in β-Lactam-Resistant Laboratory Mutants and Clinical Isolates: Disruption Versus Reduced Penicillin Affinity.
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β-内酰胺抗性实验室突变体和临床分离株中的 PBP2a:破坏与青霉素亲和力降低

DOI:
10.1089/mdr.2017.0302
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发表时间:
2017
影响因子:
2.6
通讯作者:
Regine
Regine
中科院分区:
医学4区
文献类型:
--
作者:
van der Linden;Rutschmann;Maurer;Patrick;Hakenbeck;Regine

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肺炎链球菌实验室耐药突变株和耐β内酰胺类临床分离株均存在PBP2a基因突变。DNA测序揭示了这两种设置之间的根本差异。在所分析的所有三个实验室突变体中都存在pbp2a的内部终止密码子,这是由突变体C604的inpbp2a突变引起的,以及在pbp2a内的串联复制导致另外两个突变体C403和C406的提前终止密码子。相反,在来自南非、捷克共和国、匈牙利的几个青霉素耐药临床分离株和克隆Poland23F-16中发现了嵌合体PBP2a基因,序列块与敏感株的序列差异超过4%。除南非株的pbp2a外,大多数变异株都含有与混合链球菌B6相关的topbp2aa序列,证实该种是青霉素耐药决定簇的储存库。
Alterations in PBP2a have been recognized in cefotaxime-resistant laboratory mutants and β-lactam–resistant clinical isolates ofStreptococcus pneumoniae. DNA sequencing revealed fundamental differences between these two settings. Internal stop codons inpbp2aoccurred in all three laboratory mutants analyzed, caused by a mutation inpbp2aof mutant C604, and tandem duplications withinpbp2aresulting in premature stop codons in another two mutants C403 and C406. In contrast, mosaic PBP2a genes were observed in several penicillin-resistant clinical isolates from South Africa, the Czech Republic, Hungary, and in the clone Poland23F-16, with sequence blocks diverging from sensitive strains by over 4%. Most of thesepbp2avariants exceptpbp2afrom the South African strain contained sequences related topbp2aofStreptococcus mitisB6, confirming that this species serves as reservoir for penicillin-resistance determinants.
DOI: 10.1089/107662900419438
发表时间: 2000
影响因子: 2.6
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