4zlh
From Proteopedia
Structure of the LapB cytoplasmic domain at 2 angstroms
Structural highlights
FunctionLAPB_ECO57 Modulates cellular lipopolysaccharide (LPS) levels by regulating LpxC, which is involved in lipid A biosynthesis. May act by modulating the proteolytic activity of FtsH towards LpxC. May also coordinate assembly of proteins involved in LPS synthesis at the plasma membrane.[HAMAP-Rule:MF_00994] Publication Abstract from PubMedLipopolysaccharide (LPS) synthesis and export are essential pathways for bacterial growth, proliferation, and virulence. The essential protein LapB from Escherichia coli has recently been identified as a regulator of LPS synthesis. We have determined the crystal structure of LapB (without the N-terminal transmembrane helix) at 2 A resolution using zinc single-wavelength anomalous diffraction phasing derived from a single bound zinc atom. This structure demonstrates the presence of nine tetratricopeptide repeats (TPR) motifs, including two TPR folds that were not predicted from sequence, and a rubredoxin-type metal binding domain. The rubredoxin domain is bound intimately to the TPR motifs, which has not been previously observed or predicted. Mutations in the rubredoxin/TPR interface inhibit in vivo cell growth, and in vitro studies indicate that these modifications cause local displacement of rubredoxin from its binding site without changing the secondary structure of LapB. LapB is the first reported structure to contain both a rubredoxin domain and TPR motifs. An Unexpected Duo: Rubredoxin Binds Nine TPR Motifs to Form LapB, an Essential Regulator of Lipopolysaccharide Synthesis.,Prince C, Jia Z Structure. 2015 Aug 4;23(8):1500-6. doi: 10.1016/j.str.2015.06.011. Epub 2015 Jul, 16. PMID:26190574[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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