IUBMB Enzyme Nomenclature


Accepted name: kexin

Reaction: Cleavage of -Lys-Arg and -Arg-Arg bonds to process yeast α-factor pheromone and killer toxin precursors

Other names: yeast KEX2 protease; proteinase yscF; prohormone-processing endoprotease; paired-basic endopeptidase; yeast cysteine proteinase F (misleading); paired-basic endopeptidase; andrenorphin-Gly-generating enzyme; endoproteinase Kex2p; gene KEX2 dibasic proteinase; Kex 2p proteinase; Kex2 endopeptidase; Kex2 endoprotease; Kex2 endoproteinase; Kex2 protease; proteinase Kex2p; Kex2-like precursor protein processing endoprotease; prohormone-processing KEX2 proteinase; prohormone-processing proteinase; proprotein convertase; protease KEX2; Kex2 proteinase; Kex2-like endoproteinase

Comments: A Ca2+-activated peptidase of peptidase family S8, containing Cys near the active site His, and inhibited by p-mercuribenzoate. Similar enzymes occur in mammals. Formerly EC

Links to other databases: BRENDA, EXPASY, KEGG, MEROPS, Metacyc, PDB, CAS registry number: 99676-46-7


1. Julius, D., Brake, A., Blair, L., Kunisawa, R. and Thorner, J. Isolation of the putative structural gene for the lysine-arginine-cleaving endopeptidase required for processing of yeast prepro-α-factor. Cell 37 (1984) 1075-1089. [PMID: 6430565]

2. Achstetter, T. and Wolf, D.H. Hormone processing and membrane-bound proteinases in yeast. EMBO J. 4 (1985) 173-177. [PMID: 3894003]

3. Mizuno, K., Nakamura, T., Ohshima, T., Tanaka, S. and Matsuo, H. Yeast KEX2 gene encodes an endopeptidase homologous to subtilisin-like serine proteases. Biochem. Biophys. Res. Commun. 156 (1988) 246-254 [PMID: 2845974]

4. Fuller, R.S., Brake, A. and Thorner, J. Yeast prohormone processing enzyme (KEX2 gene product) is a Ca2+-dependent serine protease. Proc. Natl. Acad. Sci. USA 86 (1989) 1434-1438. [PMID: 2646633]

5. Mizuno, K., Nakamura, T., Ohshima, T., Tanaka, S. and Matsuo, H. Characterization of KEX2-encoded endopeptidase from yeast Saccharomyces cerevisiae. Biochem. Biophys. Res. Commun. 159 (1989) 305-311 [PMID: 2845974]

[EC created 1989 as EC, transferred 1992 to EC]

Return to EC 3.4.21 home page
Return to EC 3.4 home page
Return to EC 3 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page