Topoisomerase I of Helicobacter pylori: juxtaposition with a flagellin gene (flaB) and functional requirement of a fourth zinc finger motif

Gene
Sebastian SuerbaumK Drlica

Abstract

Cloning and nucleotide sequence analysis showed that in Helicobacter pylori the gene encoding topoisomerase I (topA) lies about 170 nucleotides upstream from flaB, a gene encoding one of the two flagellin proteins that is required for virulence. The topA and flaB genes are divergently transcribed. The orientation and spatial relationship between flaB and topA are remarkably conserved among strains of a bacterium in which genomic rearrangements are common. The deduced amino acid sequence of topoisomerase I revealed four zinc finger motifs, one more than has been reported previously for the Escherichia coli homologue. The additional motif, which is near the C-terminus of the protein, appears to be essential for function since mutations in that region are lethal. These data show that TopA proteins can be divided into several classes on the basis of zinc finger motifs and raise the interesting possibility that the H. pylori enzyme has local topological effects focussed on a flagellin gene.

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Citations

Dec 2, 2008·Nucleic Acids Research·Yuk-Ching Tse-Dinh
Feb 6, 2007·International Journal of Medical Microbiology : IJMM·Fang YeSebastian Suerbaum
Apr 16, 2015·Future Medicinal Chemistry·Yuk-Ching Tse-Dinh
Oct 30, 1998·Biochemical and Biophysical Research Communications·A Ahumada, Y C Tse-Dinh
Nov 5, 1999·Annual Review of Microbiology·Z Ge, D E Taylor
Jun 11, 2016·Future Medicinal Chemistry·Yuk-Ching Tse-Dinh
Apr 27, 2016·Antimicrobial Agents and Chemotherapy·Shayna SandhausYuk-Ching Tse-Dinh
Feb 21, 2002·World Journal of Gastroenterology : WJG·W S JiD M Fan
Jan 7, 2021·Microorganisms·Ahmed SeddekYuk-Ching Tse-Dinh

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