4NAQ

Crystal structure of porcine aminopeptidase-N complexed with poly-alanine

Replaces:  4HOLReplaces:  4FKF

Summary for 4NAQ

• Entry DOI: 10.2210/pdb4naq/pdb
• Related: 4FKE
• Descriptor: Aminopeptidase N, poly A peptide, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (7 entities in total)
• Functional Keywords: zinc-aminopeptidase, hydrolase
• Biological source: Sus scrofa (pig)
• Total number of polymer chains: 2
• Total formula weight: 108257.75

Authors

Chen, L.,Lin, Y.L.,Peng, G.,Li, F. (deposition date: 2013-10-22, release date: 2013-12-04, Last modification date: 2020-07-29)

Primary citation

Chen, L.,Lin, Y.L.,Peng, G.,Li, F.
Structural basis for multifunctional roles of mammalian aminopeptidase N.
Proc.Natl.Acad.Sci.USA, 109:17966-17971, 2012

PubMed Abstract: Mammalian aminopeptidase N (APN) plays multifunctional roles in many physiological processes, including peptide metabolism, cell motility and adhesion, and coronavirus entry. Here we determined crystal structures of porcine APN at 1.85 Å resolution and its complexes with a peptide substrate and a variety of inhibitors. APN is a cell surface-anchored and seahorse-shaped zinc-aminopeptidase that forms head-to-head dimers. Captured in a catalytically active state, these structures of APN illustrate a detailed catalytic mechanism for its aminopeptidase activity. The active site and peptide-binding channel of APN reside in cavities with wide openings, allowing easy access to peptides. The cavities can potentially open up further to bind the exposed N terminus of proteins. The active site anchors the N-terminal neutral residue of peptides/proteins, and the peptide-binding channel binds the remainder of the peptides/proteins in a sequence-independent fashion. APN also provides an exposed outer surface for coronavirus binding, without its physiological functions being affected. These structural features enable APN to function ubiquitously in peptide metabolism, interact with other proteins to mediate cell motility and adhesion, and serve as a coronavirus receptor. This study elucidates multifunctional roles of APN and can guide therapeutic efforts to treat APN-related diseases.

PubMed: 23071329
DOI: 10.1073/pnas.1210123109

Experimental method

X-RAY DIFFRACTION (2.1 Å)