The Enzyme Database

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EC 3.4.21.106     
Accepted name: hepsin
Reaction: Cleavage after basic amino-acid residues, with Arg strongly preferred to Lys
Comments: This type-II membrane-associated serine peptidase has been implicated in cell growth and development [1,3]. The enzyme has been shown to activate blood coagulation factor VII by cleavage of the Arg152┼Ile153 peptide bound in BHK cells, thus indicating a possible role in the initiation of blood coagulation [2]. There is no cleavage after aromatic or aliphatic residues [1]. The occupancy of the S2 site is an absolute requirement for catalysis and a basic residue at that site is preferred to an aliphatic residue. The nature of the residue at S3 also affects hydrolysis, with Gln being much more favourable than Ala [1]. Belongs in peptidase family S1A.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 112398-23-9
References:
1.  Zhukov, A., Hellman, U. and Ingelman-Sundberg, M. Purification and characterization of hepsin from rat liver microsomes. Biochim. Biophys. Acta 1337 (1997) 85–95. [PMID: 9003440]
2.  Kazama, Y., Hamamoto, T., Foster, D.C. and Kisiel, W. Hepsin, a putative membrane-associated serine protease, activates human factor VII and initiates a pathway of blood coagulation on the cell surface leading to thrombin formation. J. Biol. Chem. 270 (1995) 66–72. [PMID: 7814421]
3.  Torres-Rosado, A., O'Shea, K.S., Tsuji, A., Chou, S.H. and Kurachi, K. Hepsin, a putative cell-surface serine protease, is required for mammalian cell growth. Proc. Natl. Acad. Sci. USA 90 (1993) 7181–7185. [PMID: 8346233]
[EC 3.4.21.106 created 2006]
 
 


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