title: Characterization of two esteroproteases from the male mouse submandibular gland.
abstract: Three major esteroproteases, proteases A and D and P-esterase, obtained from the glands were studied kinetically and chemically; two (proteases A and D) were identified. Protease A is composed of a single subunit, molecular weight (27,600) similar to the native molecule (27,000); protease D consists of three subunits, approximate molecular weights of 9200, 7600 and 4600. P-esterase contains two subunits, approximate molecular weights of 7100 and 14,000. Protease A exhibits a strong kinin-releasing activity; the other two enzymes have low activity. Protease D binds to low molecular weight-epidermal growth factor, forming a complex which has an electrophoretic mobility similar to that of high molecular weight-epidermal growth factors. When beta-nerve growth factor was incubated with protease A, the amino-terminal amino acid, serine, was lost from the growth factor and a new amino-terminal amino acid, methionine, appeared. These data indicate that proteases D and A are the same proteins as epidermal growth factor-binding protein and beta-nerve growth factor endopeptidase, respectively. From a comparison of the peptide maps of trypsin-digests of the enzymes, the proteases A and D were inferred to have a similar primary structure.
mesh_terms: D000818:Animals; D010450:Endopeptidases / Q000378:metabolism; D004815:Epidermal Growth Factor / Q000378:metabolism; D066246:ErbB Receptors; D007610:Kallikreins / Q000378:metabolism; D007700:Kinetics; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008970:Molecular Weight; D009414:Nerve Growth Factors / Q000378:metabolism; D010446:Peptide Fragments / Q000032:analysis; D010447:Peptide Hydrolases / Q000378:metabolism*; D011956:Receptors, Cell Surface / Q000378:metabolism; D012697:Serine Endopeptidases / Q000378:metabolism; D013363:Submandibular Gland / Q000201:enzymology*; D020840:Tissue Kallikreins
chemical_list: C013614:7S nerve growth factor complex; D009414:Nerve Growth Factors; D010446:Peptide Fragments; D011956:Receptors, Cell Surface; D004815:Epidermal Growth Factor; D066246:ErbB Receptors; D010450:Endopeptidases; D010447:Peptide Hydrolases; C044499:submandibular proteinase A; D007610:Kallikreins; D012697:Serine Endopeptidases; D020840:Tissue Kallikreins