Structural highlights
Function[AMPN_ECOLI] Aminopeptidase N is involved in the degradation of intracellular peptides generated by protein breakdown during normal growth as well as in response to nutrient starvation. Publication Abstract from PubMedAminopeptidases are ubiquitous hydrolases that cleave the N-terminal residues of proteins and oligopeptides. They are broadly distributed throughout all kingdoms of life and have been implicated in a wide variety of physiological processes, including viral infection, parasite metabolism, protein processing, regulation of peptide hormones, and cancer cell proliferation. Members of the M1 family, also termed gluzincins, are defined by two highly conserved motifs in the catalytic domain: a zinc binding motif, HEXXH-(X18)-E; and an exopeptidase motif, GXMEN. We report the high-resolution x-ray structures of E. coli aminopeptidase N (PepN) in complex with three aminobenzosuberone scaffolds that display various Ki values (50microM, 0.33microM and 0.034microM) and provide a compelling view of the outstanding selectivity of these chemical entities for the M1 aminopeptidases. This series of inhibitors interacts as transition state mimics with highly conserved residues of the catalytic machinery and substrate recognition sites. Structural comparisons and model-building studies allowed a deep interpretation of the SAR observed for bacterial, as well as mammalian enzymes. This article is protected by copyright. All rights reserved. Insight into the remarkable affinity and selectivity of the aminobenzosuberone scaffold for the M1 Aminopeptidases family based on structure analysis.,Peng G, McEwen AG, Olieric V, Schmitt C, Albrecht S, Cavarelli J, Tarnus C Proteins. 2017 Apr 6. doi: 10.1002/prot.25301. PMID:28383176[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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