Abstract:
:The protein structure, kinin-releasing activity, and tissue distribution of four major proteinases of mouse submandibular gland (mK22, mK9, proteinase F, proteinase P) were studied. When compared with the deduced amino acid sequence of each member of the tissue (glandular) kallikrein gene family, the amino acid sequence of proteinase F determined (approximately 40% of the total) was found to agree completely with the deduced amino acid sequence of mKlk-1. The proteinase P sequence, on the other hand, agreed with that of the product of mKlk-13, mK13 (prorenin-converting enzyme). Proteinase F had the strongest kininogenase activity for both low-molecular-weight and high-molecular-weight kininogen, while mK22 had 1/6 and 1/50 the activity of proteinase F for the respective kininogen substrate. Kininogenase activities of mK9 and proteinase P were less than 1/100 of the activity of proteinase F for both substrates. Acting on the two kininogen substrates, kallikreins mK22, mK9, and proteinase F, but not proteinase P, specifically released bradykinin, suggesting that the former three kallikreins strictly recognized peptide sequences around bradykinin in these substrate molecules but proteinase P recognized several sites in these molecules. Significant amounts of proteinase F, but not mK22 and others, were present in the urine, pancreas and digestive organs, as well as in the salivary glands. The present results revealed that the former proteinase F is identical to mK1, tissue/renal kallikrein, and confirmed its characteristics as a true kallikrein on the basis of its kinin-releasing activity and tissue distribution.
journal_name
J Biochemjournal_title
Journal of biochemistryauthors
Hosoi K,Tsunasawa S,Kurihara K,Aoyama H,Ueha T,Murai T,Sakiyama Fdoi
10.1093/oxfordjournals.jbchem.a124288subject
Has Abstractpub_date
1994-01-01 00:00:00pages
137-43issue
1eissn
0021-924Xissn
1756-2651journal_volume
115pub_type
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