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signal peptide peptidase SppA, 36K type The related but duplicated, double-length protein SppA (protease IV) of E. coli was shown experimentally to degrade signal peptides as are released by protein processing and secretion. This protein shows stronger homology to the C-terminal region of SppA than to the N-terminal domain or to the related putative protease SuhB. The member of this family from Bacillus subtilis was shown to have properties consistent with a role in degrading signal peptides after cleavage from precursor proteins, although it was not demonstrated conclusively. [Protein fate, Degradation of proteins, peptides, and glycopeptides]
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Jiyao W et al.(2023). "The conserved domain database in 2023.",