IUBMB Enzyme Nomenclature

EC 3.4.23.19

Accepted name: aspergillopepsin II

Reaction: Preferential cleavage in B chain of insulin: Asn³Gln, Gly¹³Ala, Tyr²⁶Thr

Other names: proteinase A; proctase A; Aspergillus niger var. macrosporus aspartic proteinase

Comments: Isolated from Aspergillus niger var. macrosporus, distinct from proteinase B (see aspergillopepsin I) in specificity and insensitivity to pepstatin. In peptidase family A4 (scytalidopepsin B family). Formerly included in EC 3.4.23.6

Links to other databases: BRENDA, EXPASY, KEGG, MEROPS, Metacyc, PDB, CAS registry number: 9025-49-4

References:

1. Chang, W.-J., Horiuchi, S., Takahashi, K., Yamasaki, M. and Yamada, Y. The structure and function of acid proteases. VI. Effects of acid protease-specific inhibitors on the acid proteases from Aspergillus niger var. macrosporus. J. Biochem. (Tokyo) 80 (1976) 975-981. [PMID: 12156]

2. Iio, K. and Yamasaki, M. Specificity of acid proteinase A from Aspergillus niger var. macrosporus towards B-chain of performic acid oxidized bovine insulin. Biochim. Biophys. Acta 429 (1976) 912-924. [PMID: 1268233]

[EC 3.4.23.19 created 1992 (EC 3.4.23.6 created 1992 (EC 3.4.23.6 created 1961 as EC 3.4.4.17, transferred 1972 to EC 3.4.23.6, modified 1981 [EC 3.4.23.7, EC 3.4.23.8, EC 3.4.23.9, EC 3.4.23.10, EC 3.4.99.1, EC 3.4.99.15 and EC 3.4.99.25 all created 1972 and incorporated 1978], part incorporated 1992)]

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