Characterization of the single stranded DNA binding protein SsbB encoded in the Gonoccocal Genetic Island.

ABSTRACT:

Background

Most strains of Neisseria gonorrhoeae carry a Gonococcal Genetic Island which encodes a type IV secretion system involved in the secretion of ssDNA. We characterize the GGI-encoded ssDNA binding protein, SsbB. Close homologs of SsbB are located within a conserved genetic cluster found in genetic islands of different proteobacteria. This cluster encodes DNA-processing enzymes such as the ParA and ParB partitioning proteins, the TopB topoisomerase, and four conserved hypothetical proteins. The SsbB homologs found in these clusters form a family separated from other ssDNA binding proteins.

Methodology/principal findings

In contrast to most other SSBs, SsbB did not complement the Escherichia coli ssb deletion mutant. Purified SsbB forms a stable tetramer. Electrophore

SUBMITTER: Jain S 

PROVIDER: S-EPMC3334931 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature