Characterization of a ComE3 homologue essential for DNA transformation in Helicobacter pylori

Yu Ching Yeh, Tzu Lung Lin, Kai Chih Chang, Jin Town Wang*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

33 Scopus citations


To find genes involved in natural competence in Helicobacter pylori, we used a bioinformatics database search and found two transformation-related open reading frames (ORFs): a comE3 homologue (HP1361 ORF) of Bacillus subtilis and a comL homologue (HP1378 ORF) of Neisseria gonorrhoeae. We failed to obtain an HP1378 ORF knockout mutant, while an HP1361 ORF knockout mutant was obtained by transposon shuttle mutagenesis. The DNA transformation abilities of both natural transformation and electroporation were severely impaired (frequency, <10-9) in the HP1361- mutant. Complementation with a pHel2 vector carrying the HP1361 ORF restored the capabilities of natural competence (to a frequency of 4.21 × 10-7) and electroporation (to 3.62 × 10-7). The HP1361- mutant showed impairment in DNA binding and uptake. The results suggest that HP1361 is a comE3 homologue and is required for DNA binding and uptake during DNA transformation.

Original languageEnglish
Pages (from-to)5427-5431
Number of pages5
JournalInfection and Immunity
Issue number9
StatePublished - 01 09 2003
Externally publishedYes


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