XPNPEP1

Xaa-Pro aminopeptidase 1 is an enzyme that in humans is encoded by the XPNPEP1 gene.[5]

XPNPEP1
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 3CTZ
Identifiers
Aliases	XPNPEP1, APP1, SAMP, XPNPEP, XPNPEPL, XPNPEPL1, X-prolyl aminopeptidase (aminopeptidase P) 1, soluble, X-prolyl aminopeptidase 1
External IDs	OMIM: 602443 MGI: 2180003 HomoloGene: 6424 GeneCards: XPNPEP1
Gene location (Human) Chr. Chromosome 10 (human)[1] Band 10q25.1 Start 109,864,766 bp[1] End 109,923,553 bp[1]
Gene location (Mouse) Chr. Chromosome 19 (mouse)[2] Band 19|19 D2 Start 52,931,926 bp[2] End 53,040,214 bp[2]
RNA expression pattern More reference expression data
Gene ontology Molecular function • peptidase activity • aminopeptidase activity • hydrolase activity • metallopeptidase activity • protein homodimerization activity • manganese ion binding • metal ion binding • metalloaminopeptidase activity Cellular component • extracellular exosome • cytoplasm • cytosol Biological process • bradykinin catabolic process • proteolysis Sources:Amigo / QuickGO
Orthologs
Species	Human	Mouse
Entrez	7511	170750
Ensembl	ENSG00000108039	ENSMUSG00000025027
UniProt	Q9NQW7	Q6P1B1
RefSeq (mRNA)	NM_001167604 NM_020383 NM_001324128 NM_001324131 NM_001324132 NM_001324133 NM_001324134 NM_001324135 NM_001324136	NM_133216 NM_001374834
RefSeq (protein)	NP_001161076 NP_001311057 NP_001311060 NP_001311061 NP_001311062 NP_001311063 NP_001311064 NP_001311065 NP_065116	NP_573479
Location (UCSC)	Chr 10: 109.86 – 109.92 Mb	Chr 19: 52.93 – 53.04 Mb
PubMed search	[3]	[4]
Wikidata
View/Edit Human View/Edit Mouse

Function

X-prolyl aminopeptidase (EC 3.4.11.9) is a proline-specific metalloaminopeptidase that specifically catalyzes the removal of any unsubstituted N-terminal amino acid that is adjacent to a penultimate proline residue. Because of its specificity toward proline, it has been suggested that X-prolyl aminopeptidase is important in the maturation and degradation of peptide hormones, neuropeptides, and tachykinins, as well as in the digestion of otherwise resistant dietary protein fragments, thereby complementing the pancreatic peptidases. Deficiency of X-prolyl aminopeptidase results in excretion of large amounts of imino-oligopeptides in urine (Blau et al., 1988).[supplied by OMIM][5]

Model organisms

Model organisms have been used in the study of XPNPEP1 function. A conditional knockout mouse line called Xpnpep1^{tm1a(KOMP)Wtsi} was generated at the Wellcome Trust Sanger Institute.[6] Male and female animals underwent a standardized phenotypic screen[7] to determine the effects of deletion.[8][9][10][11] Additional screens performed: - In-depth immunological phenotyping[12] - in-depth bone and cartilage phenotyping[13]

Xpnpep1 knockout mouse phenotype

Characteristic	Phenotype
All data available at.[7][12][13]
Peripheral blood leukocytes 6 Weeks	Normal
Haematology 6 Weeks	Normal
Insulin	Normal
Homozygous viability at P14	Abnormal
Homozygous Fertility	Normal
Body weight	Abnormal
Neurological assessment	Normal
Grip strength	Normal
Dysmorphology	Normal
Indirect calorimetry	Abnormal
Glucose tolerance test	Normal
Auditory brainstem response	Normal
DEXA	Abnormal
Radiography	Abnormal
Eye morphology	Normal
Clinical chemistry	Abnormal
Haematology 16 Weeks	Normal
Peripheral blood leukocytes 16 Weeks	Abnormal
Heart weight	Normal
Salmonella infection	Normal
Cytotoxic T Cell Function	Normal
Spleen Immunophenotyping	Normal
Mesenteric Lymph Node Immunophenotyping	Normal
Bone Marrow Immunophenotyping	Normal
Epidermal Immune Composition	Normal

References

1. GRCh38: Ensembl release 89: ENSG00000108039 - Ensembl, May 2017
2. GRCm38: Ensembl release 89: ENSMUSG00000025027 - Ensembl, May 2017
3. "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
4. "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
5. "Entrez Gene: XPNPEP1 X-prolyl aminopeptidase (aminopeptidase P) 1, soluble".
6. Gerdin AK (2010). "The Sanger Mouse Genetics Programme: high throughput characterisation of knockout mice". Acta Ophthalmologica. 88: 925–7. doi:10.1111/j.1755-3768.2010.4142.x. S2CID 85911512.
7. "International Mouse Phenotyping Consortium".
8. Skarnes WC, Rosen B, West AP, Koutsourakis M, Bushell W, Iyer V, Mujica AO, Thomas M, Harrow J, Cox T, Jackson D, Severin J, Biggs P, Fu J, Nefedov M, de Jong PJ, Stewart AF, Bradley A (Jun 2011). "A conditional knockout resource for the genome-wide study of mouse gene function". Nature. 474 (7351): 337–42. doi:10.1038/nature10163. PMC 3572410. PMID 21677750.
9. Dolgin E (Jun 2011). "Mouse library set to be knockout". Nature. 474 (7351): 262–3. doi:10.1038/474262a. PMID 21677718.
10. Collins FS, Rossant J, Wurst W (Jan 2007). "A mouse for all reasons". Cell. 128 (1): 9–13. doi:10.1016/j.cell.2006.12.018. PMID 17218247. S2CID 18872015.
11. White JK, Gerdin AK, Karp NA, Ryder E, Buljan M, Bussell JN, Salisbury J, Clare S, Ingham NJ, Podrini C, Houghton R, Estabel J, Bottomley JR, Melvin DG, Sunter D, Adams NC, Tannahill D, Logan DW, Macarthur DG, Flint J, Mahajan VB, Tsang SH, Smyth I, Watt FM, Skarnes WC, Dougan G, Adams DJ, Ramirez-Solis R, Bradley A, Steel KP (Jul 2013). "Genome-wide generation and systematic phenotyping of knockout mice reveals new roles for many genes". Cell. 154 (2): 452–64. doi:10.1016/j.cell.2013.06.022. PMC 3717207. PMID 23870131.
12. "Infection and Immunity Immunophenotyping (3i) Consortium".
13. "OBCD Consortium".

Further reading

• Vanhoof G, De Meester I, Goossens F, Hendriks D, Scharpé S, Yaron A (Aug 1992). "Kininase activity in human platelets: cleavage of the Arg1-Pro2 bond of bradykinin by aminopeptidase P". Biochemical Pharmacology. 44 (3): 479–87. doi:10.1016/0006-2952(92)90439-P. PMID 1510698.
• Blau N, Niederwieser A, Shmerling DH (1988). "Peptiduria presumably caused by aminopeptidase-P deficiency. A new inborn error of metabolism". Journal of Inherited Metabolic Disease. 11 Suppl 2: 240–2. doi:10.1007/BF01804246. PMID 3141711. S2CID 32596444.
• Maruyama K, Sugano S (Jan 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
• Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (Oct 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149.
• Vanhoof G, Goossens F, Juliano MA, Juliano L, Hendriks D, Schatteman K, Lin AH, Scharpé S (1998). "Isolation and sequence analysis of a human cDNA clone (XPNPEPL) homologous to X-prolyl aminopeptidase (aminopeptidase P)". Cytogenetics and Cell Genetics. 78 (3–4): 275–80. doi:10.1159/000134671. PMID 9465902.
• Sprinkle TJ, Caldwell C, Ryan JW (Jun 2000). "Cloning, chromosomal sublocalization of the human soluble aminopeptidase P gene (XPNPEP1) to 10q25.3 and conservation of the putative proton shuttle and metal ligand binding sites with XPNPEP2". Archives of Biochemistry and Biophysics. 378 (1): 51–6. doi:10.1006/abbi.2000.1792. PMID 10871044.
• Cottrell GS, Hooper NM, Turner AJ (Dec 2000). "Cloning, expression, and characterization of human cytosolic aminopeptidase P: a single manganese(II)-dependent enzyme". Biochemistry. 39 (49): 15121–8. doi:10.1021/bi001585c. PMID 11106490.
• Gevaert K, Goethals M, Martens L, Van Damme J, Staes A, Thomas GR, Vandekerckhove J (May 2003). "Exploring proteomes and analyzing protein processing by mass spectrometric identification of sorted N-terminal peptides". Nature Biotechnology. 21 (5): 566–9. doi:10.1038/nbt810. PMID 12665801. S2CID 23783563.