2irv is a 2 chain structure with sequence from Escherichia coli. The August 2011 RCSB PDB Molecule of the Month feature on Rhomboid Protease GlpG by David Goodsell is 10.2210/rcsb_pdb/mom_2011_8. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Intramembrane proteases catalyze peptide bond cleavage of integral membrane protein substrates. This activity is crucial for many biological and pathological processes. Rhomboids are evolutionarily widespread intramembrane serine proteases. Here, we present the 2.3-A-resolution crystal structure of a rhomboid from Escherichia coli. The enzyme has six transmembrane helices, five of which surround a short TM4, which starts deep within the membrane at the catalytic serine residue. Thus, the catalytic serine is in an externally exposed cavity, which provides a hydrophilic environment for proteolysis. Our results reveal a mechanism to enable water-dependent catalysis at the depth of the hydrophobic milieu of the membrane and suggest how substrates gain access to the sequestered rhomboid active site.
Structural basis for intramembrane proteolysis by rhomboid serine proteases.,Ben-Shem A, Fass D, Bibi E Proc Natl Acad Sci U S A. 2007 Jan 9;104(2):462-6. Epub 2006 Dec 26. PMID:17190827[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
↑ Ben-Shem A, Fass D, Bibi E. Structural basis for intramembrane proteolysis by rhomboid serine proteases. Proc Natl Acad Sci U S A. 2007 Jan 9;104(2):462-6. Epub 2006 Dec 26. PMID:17190827
