Crystal structure of SmcR, a quorum-sensing master regulator of Vibrio vulnificus, provides insight into its regulation of transcription

Yoonjeong Kim, Byoung Sik Kim, Yu Jin Park, Won Chan Choi, Jungwon Hwang, Beom Sik Kang, Tae Kwang Oh, Sang Ho Choi, Myung Hee Kim

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Quorum sensing has been implicated as an important global regulatory system controlling the expression of numerous virulence factors in bacterial pathogens. SmcR, a homologue of Vibrio harveyi LuxR, has been proposed as a quorum-sensing master regulator of Vibrio vulnificus, an opportunistic human pathogen. Previous studies demonstrated that SmcR is essential for the survival and pathogenesis of V. vulnificus, indicating that inhibiting SmcR is an attractive approach to combat infections by the bacteria. Here, we determined the crystal structure of SmcR at 2.1 Å resolution. The protein structure reveals a typical TetR superfamily fold consisting of an N-terminalDNAbinding domain and a C-terminal dimerization domain. In vivo and in vitro functional analysis of the dimerization domain suggested that dimerization of SmcR is vital for its biological regulatory function. The N-terminal DNA recognition and binding residues were assigned based on the protein structure and the results of in vivo and in vitro mutagenesis experiments. Furthermore, protein-DNA interaction experiments suggested that SmcRmay have a sophisticated mechanism that enables the protein to recognize each of its many target operators with different affinities.

Original languageEnglish
Pages (from-to)14020-14030
Number of pages11
JournalJournal of Biological Chemistry
Volume285
Issue number18
DOIs
StatePublished - 30 Apr 2010

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