| Structural highlights
4fyq is a 1 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Method: | X-ray diffraction, Resolution 1.9Å |
| Ligands: | ACY, BMA, NAG, SO4, ZN |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
AMPN_HUMAN Broad specificity aminopeptidase. Plays a role in the final digestion of peptides generated from hydrolysis of proteins by gastric and pancreatic proteases. May play a critical role in the pathogenesis of cholesterol gallstone disease. May be involved in the metabolism of regulatory peptides of diverse cell types, responsible for the processing of peptide hormones, such as angiotensin III and IV, neuropeptides, and chemokines. Found to cleave antigen peptides bound to major histocompatibility complex class II molecules of presenting cells and to degrade neurotransmitters at synaptic junctions. Is also implicated as a regulator of IL-8 bioavailability in the endometrium, and therefore may contribute to the regulation of angiogenesis. Is used as a marker for acute myeloid leukemia and plays a role in tumor invasion. In case of human coronavirus 229E (HCoV-229E) infection, serves as receptor for HCoV-229E spike glycoprotein. Mediates as well human cytomegalovirus (HCMV) infection.[1] [2] [3] [4] [5] [6] [7] [8] [9]
Publication Abstract from PubMed
Human aminopeptidase N (hAPN/hCD13) is a dimeric membrane protein and a member of the M1 family of zinc metallopeptidases. Within the rennin-angiotensin system, its enzymatic activity is responsible for processing peptide hormones angiotensin III and IV. In addition, hAPN is also involved in cell adhesion, endocytosis, and signal transduction and it is an important target for cancer therapy. Reported here are the high resolution x-ray crystal structures of the dimeric ectodomain of hAPN and its complexes with angiotensin IV and the peptidomimetic inhibitors, amastatin and bestatin. Each monomer of the dimer is found in what has been termed the closed form in other M1 enzymes and each monomer is characterized by an internal cavity surrounding the catalytic site as well as a unique substrate/inhibitor-dependent loop ordering, which in the case of the bestatin complex suggests a new route to inhibitor design. The hAPN structure provides the first example of a dimeric M1 family member and the observed structural features, in conjunction with a model for the open form, provide novel insights into the mechanism of peptide processing and signal transduction.
The X-ray Crystal Structure of Human Aminopeptidase N Reveals a Novel Dimer and the Basis for Peptide Processing.,Wong AH, Zhou D, Rini JM J Biol Chem. 2012 Oct 26;287(44):36804-13. doi: 10.1074/jbc.M112.398842. Epub, 2012 Aug 29. PMID:22932899[10]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Yeager CL, Ashmun RA, Williams RK, Cardellichio CB, Shapiro LH, Look AT, Holmes KV. Human aminopeptidase N is a receptor for human coronavirus 229E. Nature. 1992 Jun 4;357(6377):420-2. PMID:1350662 doi:https://dx.doi.org/10.1038/357420a0
- ↑ Soderberg C, Giugni TD, Zaia JA, Larsson S, Wahlberg JM, Moller E. CD13 (human aminopeptidase N) mediates human cytomegalovirus infection. J Virol. 1993 Nov;67(11):6576-85. PMID:8105105
- ↑ Kolb AF, Maile J, Heister A, Siddell SG. Characterization of functional domains in the human coronavirus HCV 229E receptor. J Gen Virol. 1996 Oct;77 ( Pt 10):2515-21. PMID:8887485
- ↑ Noren K, Hansen GH, Clausen H, Noren O, Sjostrom H, Vogel LK. Defectively N-glycosylated and non-O-glycosylated aminopeptidase N (CD13) is normally expressed at the cell surface and has full enzymatic activity. Exp Cell Res. 1997 Feb 25;231(1):112-8. PMID:9056417 doi:10.1006/excr.1996.3455
- ↑ Hegyi A, Kolb AF. Characterization of determinants involved in the feline infectious peritonitis virus receptor function of feline aminopeptidase N. J Gen Virol. 1998 Jun;79 ( Pt 6):1387-91. PMID:9634079
- ↑ Dong X, An B, Salvucci Kierstead L, Storkus WJ, Amoscato AA, Salter RD. Modification of the amino terminus of a class II epitope confers resistance to degradation by CD13 on dendritic cells and enhances presentation to T cells. J Immunol. 2000 Jan 1;164(1):129-35. PMID:10605003
- ↑ Pasqualini R, Koivunen E, Kain R, Lahdenranta J, Sakamoto M, Stryhn A, Ashmun RA, Shapiro LH, Arap W, Ruoslahti E. Aminopeptidase N is a receptor for tumor-homing peptides and a target for inhibiting angiogenesis. Cancer Res. 2000 Feb 1;60(3):722-7. PMID:10676659
- ↑ Seli E, Senturk LM, Bahtiyar OM, Kayisli UA, Arici A. Expression of aminopeptidase N in human endometrium and regulation of its activity by estrogen. Fertil Steril. 2001 Jun;75(6):1172-6. PMID:11384645
- ↑ van Hensbergen Y, Broxterman HJ, Hanemaaijer R, Jorna AS, van Lent NA, Verheul HM, Pinedo HM, Hoekman K. Soluble aminopeptidase N/CD13 in malignant and nonmalignant effusions and intratumoral fluid. Clin Cancer Res. 2002 Dec;8(12):3747-54. PMID:12473585
- ↑ Wong AH, Zhou D, Rini JM. The X-ray Crystal Structure of Human Aminopeptidase N Reveals a Novel Dimer and the Basis for Peptide Processing. J Biol Chem. 2012 Oct 26;287(44):36804-13. doi: 10.1074/jbc.M112.398842. Epub, 2012 Aug 29. PMID:22932899 doi:https://dx.doi.org/10.1074/jbc.M112.398842
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