A DnaB intein in Rhodothermus marinus: Indication of recent intein homing across remotely related organisms

被引:35
作者
Liu, XQ
Hu, ZM
机构
[1] Biochemistry Department, Dalhousie University, Halifax
关键词
protein splicing; mobile genetic element; DNA helicase;
D O I
10.1073/pnas.94.15.7851
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
A dnaB gene encoding a homologue of the Escherichia coli DNA helicase DnaB was cloned and sequenced in the thermophilic eubacterium Rhodothermus marinus, predicting a DnaB protein that harbors an intein. This DnaB intein is 428 amino acid residues long, has several putative intein sequence motifs (including two putative endonuclease motifs), and is capable of protein splicing when produced in E. coli cells. The R. marinus DnaB intein is a close homologue of a DnaB intein in the cyanobacterium Synechocystis sp. strain PCC6803. The two inteins are positioned identically in their respective DnaB proteins. They also share a 54% sequence identity (74% sequence similarity) that is markedly higher than the 37% sequence identity shared by the extein sequences of the two DnaB proteins. Horizontal intein transfer (homing) is therefore invoked to relate these two DnaB inteins. The codon usage of R. marinus DnaB intein coding sequence differs markedly from the codon usages of its flanking extein coding sequences and other genes in the same genome, suggesting more recent acquisition of the DnaB intein in this organism.
引用
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页码:7851 / 7856
页数:6
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