Primary Citation of Related Structures: 1YR1, 2ALJ
PubMed Abstract:
Bacterial cytokinesis requires the coordinated assembly of a complex of proteins, collectively known as the divisome, at the incipient division site. DivIB/FtsQ is a conserved component of the divisome in bacteria with cell walls, suggesting that it plays a role in synthesis and/or remodeling of septal peptidoglycan ...
Bacterial cytokinesis requires the coordinated assembly of a complex of proteins, collectively known as the divisome, at the incipient division site. DivIB/FtsQ is a conserved component of the divisome in bacteria with cell walls, suggesting that it plays a role in synthesis and/or remodeling of septal peptidoglycan. We demonstrate that the extracytoplasmic region of DivIB comprises three discrete domains that we designate alpha, beta, and gamma from the N to C terminus. The alpha-domain is proximal to the cytoplasmic membrane and coincident with the polypeptide transport-associated domain that was proposed previously to function as a molecular chaperone. The beta-domain has a unique 3D fold, with no eukaryotic counterpart, and we show that it interconverts between two discrete conformations via cis-trans isomerization of a Tyr-Pro peptide bond. We propose that this isomerization might modulate protein-protein interactions of the flanking alpha- and gamma-domains. The C-terminal gamma-domain is unstructured in the absence of other divisomal proteins, but we show that it is critical for DivIB function.
Related Citations:
Cloning and expression of a bacillus subtilis division initiation gene for which a homolog has not been identified in another organism Harry, E.J., Wake, R.G. (1989) J Bacteriol 171: 6835
Nucleotide sequence and insertional inactivation of a bacillus subtilis gene that affects cell division, sporulation, and temperature sensitivity Beall, B., Lutkenhaus, J. (1989) J Bacteriol 171: 6821
Membrane-bound division proteins DivIB and DivIC of bacillus subtilis function solely through their external domains in both vegetative and sporulation division Katis, V.L., Wake, R.G. (1999) J Bacteriol 181: 2710
Organizational Affiliation:
Department of Molecular, Microbial, and Structural Biology and Partnership for Excellence in Structural Biology, University of Connecticut Health Center, 263 Farmington Avenue, Farmington, CT 06030-3305, USA.
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