2hpt
From Proteopedia
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Crystal Structure of E. coli PepN (Aminopeptidase N)in complex with Bestatin
Overview
Aminopeptidase N from Escherichia coli is a major metalloprotease that, participates in the controlled hydrolysis of peptides in the proteolytic, pathway. Determination of the 870-aa structure reveals that it has four, domains similar to the tricorn-interacting factor F3. The thermolysin-like, active site is enclosed within a large cavity with a volume of 2,200 A(3), which is inaccessible to substrates except for a small opening of, approximately 8-10 A. The substrate-based inhibitor bestatin binds to the, protein with minimal changes, suggesting that this is the active form of, the enzyme. The previously described structure of F3 had three distinct, conformations that were described as "closed," "intermediate," and "open.", The structure of aminopeptidase N from E. coli, however, is substantially, more closed than any of these. Taken together, the results suggest that, these proteases, which are involved in intracellular peptide degradation, prevent inadvertent hydrolysis of inappropriate substrates by enclosing, the active site within a large cavity. There is also some evidence that, the open form of the enzyme, which admits substrates, remains inactive, until it adopts the closed form.
About this Structure
2HPT is a Single protein structure of sequence from Escherichia coli with ZN, BES and GOL as ligands. Active as Membrane alanyl aminopeptidase, with EC number 3.4.11.2 Full crystallographic information is available from OCA.
Reference
Structure of aminopeptidase N from Escherichia coli suggests a compartmentalized, gated active site., Addlagatta A, Gay L, Matthews BW, Proc Natl Acad Sci U S A. 2006 Sep 5;103(36):13339-44. Epub 2006 Aug 28. PMID:16938892
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