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Families of restriction enzymes: an analysis prompted by molecular and genetic data for type ID restriction and modification systems

机译:限制性内切酶家族:由分子和遗传数据提示的ID型限制和修饰系统分析

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摘要

Current genetic and molecular evidence places all the known type I restriction and modification systems of Escherichia coli and Salmonella enterica into one of four discrete families: type IA, IB, IC or ID. StySBLI is the founder member of the ID family. Similarities of coding sequences have identified restriction systems in E.coli and Klebsiella pneumoniae as probable members of the type ID family. We present complementation tests that confirm the allocation of EcoR9I and KpnAI to the ID family. An alignment of the amino acid sequences of the HsdS subunits of StySBLI and EcoR9I identify two variable regions, each predicted to be a target recognition domain (TRD). Consistent with two TRDs, StySBLI was shown to recognise a bipartite target sequence, but one in which the adenine residues that are the substrates for methylation are separated by only 6 bp. Implications of family relationships are discussed and evidence is presented that extends the family affiliations identified in enteric bacteria to a wide range of other genera.
机译:当前的遗传和分子证据将大肠杆菌和肠炎沙门氏菌的所有已知的I型限制和修饰系统置于四个离散家族之一:IA,IB,IC或ID型。 StySBLI是ID家族的创始人。编码序列的相似性已鉴定出大肠杆菌和肺炎克雷伯菌中的限制系统是ID型家族的可能成员。我们提出补充测试,以确认EcoR9I和KpnAI已分配给ID家庭。 StySBLI和EcoR9I的HsdS亚基的氨基酸序列比对可识别两个可变区,每个可变区均被预测为目标识别域(TRD)。与两个TRD一致,显示StySBLI可以识别二分靶序列,但是其中一个作为甲基化底物的腺嘌呤残基仅相隔6 bp。讨论了家庭关系的含义,并提供了证据,将在肠道细菌中确定的家庭联系扩展到其他广泛的属。

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