||A second endopeptidase from Scytalidium lignicolum (see scytalidopepsin A) that is insensitive to pepstatin and methyl 2-diazoacetamidohexanoate. 1,2-Epoxy-3-(p-nitrophenoxy)propane reacts with Glu53, which replaces one of the aspartic residues at the active centre. One of the smallest aspartic endopeptidases active as the monomer, with Mr 22,000. Similarly inhibitor-resistant endopeptidases are found in the basidiomycetes Lentinus edodes  and Ganoderma lucidum , and in Polyporus tulipiferae , a second endopeptidase distinct from polyporopepsin, but these are of typical aspartic endopeptidase size, Mr about 36,000. Type example of peptidase family G1.
||Terashita, T., Oda, K., Kono, M. and Murao, S. Streptomyces pepsin inhibitor-insensitive carboxyl proteinase from Lentinus edodes. Agric. Biol. Chem. 45 (1981) 1937–1943.
||Maita, T., Nagata, S., Matsuda, G., Maruta, S., Oda, K., Murao, S. and Tsuru, D. Complete amino acid sequence of Scytalidium lignicolum acid protease B. J. Biochem. (Tokyo) 95 (1984) 465–473. [PMID: 6370989]
||Terashita, T., Oda, K., Kono, M. and Murao, S. Streptomyces pepsin inhibitor-insensitive carboxyl proteinase from Ganoderma lucidum. Agric. Biol. Chem. 48 (1984) 1029–1035.
||Kobayashi, H., Kusakabe, I. and Murakami, K. Purification and characterization of a pepstatin-insensitive carboxyl proteinase from Polyporus tulipiferae (Irpex lacteus). Agric. Biol. Chem. 49 (1985) 2393–2397.
||Tsuru, D., Shimada, S., Maruta, S., Yoshimoto, T., Oda, K., Murao, S., Miyata, T. and Iwanaga, S. Isolation and amino acid sequence of a peptide containing an epoxide-reactive residue from the thermolysin-digest of Scytalidium lignicolum acid protease B. J. Biochem. (Tokyo) 99 (1986) 1537–1539. [PMID: 3519605]