Structural highlights
Publication Abstract from PubMedDuring the transition from a free-swimming, single-cell life-style to a sessile, multicellular state called a biofilm, bacteria produce and secrete an extracellular matrix comprised of nucleic acids, exopolysaccharides and adhesion proteins. The Vibrio cholerae biofilm matrix contains three major protein components, RbmA, Bap1 and RbmC, which are unique to Vibrio cholerae and appear to support biofilm formation at particular steps in the process. Here, we focus on RbmA, a structural protein with an unknown fold. RbmA participates in the early cell-cell adhesion events, and is found throughout the biofilm where it localizes to cell-cell contact sites. We determined crystal structures of RbmA and revealed that the protein folds into tandem fibronectin III (FnIII) folds. The protein is dimeric in solution and in crystals, with the dimer interface displaying a surface groove that is lined with several positively charged residues. Structure-guided mutagenesis studies establish a crucial role for this surface patch for RbmA function. Based on the structure, we hypothesize that RbmA serves as a tether by maintaining flexible linkages between cells and the extracellular matrix. Structural basis for biofilm formation via the Vibrio cholerae matrix protein RbmA.,Giglio KM, Fong JC, Yildiz FH, Sondermann H J Bacteriol. 2013 May 17. PMID:23687270[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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