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PMID:8942989
| Citation |
Mathialagan, N and Hansen, TR (1996) Pepsin-inhibitory activity of the uterine serpins. Proc. Natl. Acad. Sci. U.S.A. 93:13653-8 |
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| Abstract |
Among the major products secreted by the uteri of cattle, sheep, and pigs during pregnancy are glycoproteins with amino acid sequences that place them in the serpin (serine proteinase inhibitor) superfamily of proteins. The inferred amino acid sequences for bovine uterine serpin (boUS-1) and ovine uterine serpin (ovUS-1) exhibit about 72% sequence identity to each other but only about 50% and 56% identity, respectively, to two distinct porcine uterine serpins (poUS-1 and poUS-2). Despite these differences in primary structure, the uterine serpins possess well-conserved reactive center loop regions that contain several motifs present in the propeptide regions of pepsinogens. One such motif, VVVK, aligns with the first 4 amino acids of the aspartic proteinase inhibitor pepstatin. Although no inhibitory activity toward any serine proteinase has been found, at least one of the uterine serpins, ovUS-1, can bind specifically to immobilized pepsin A and can weakly inhibit the proteolytic activities of pepsin A and C (but not cathepsins D and E). OvUS-1 is the first specific inhibitor of aspartic proteinases to be identified in vertebrates and provides another example of a serpin with "crossover" activity. The pregnancy-associated glycoproteins (PAGs), which are secreted by the trophoblast layer of the placentas of ungulate species and are inactive members of the aspartic proteinase family, can also bind ovUS-1 and may be the natural target partners for the uterine serpins. |
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| Keywords |
Amino Acid Sequence; Animals; Cattle; Chromatography, Gel; DNA, Complementary; Endometrium/metabolism; Female; Gene Library; Kinetics; Molecular Sequence Data; Pepsin A/antagonists & inhibitors; Pregnancy; Pregnancy, Animal/metabolism; Protein Binding; Recombinant Proteins/biosynthesis; Recombinant Proteins/chemistry; Recombinant Proteins/pharmacology; Sequence Homology, Amino Acid; Serpins/biosynthesis; Serpins/chemistry; Serpins/pharmacology; Serum Albumin, Bovine/metabolism; Sheep; Swine; Uterus/metabolism |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0030414: peptidase inhibitor activity |
ECO:0000314: |
F |
Figure 2.a/b show evidence of %Pepsin activity severely decreased between pH of 2-4.5. Supported text for the experiment is listed under "Inhibitory Activities of Uterine Secretions" with standard assay. |
complete | ||||
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enables |
GO:0030414: peptidase inhibitor activity |
ECO:0000314: direct assay evidence used in manual assertion |
F |
Seeded From UniProt |
complete | |||
See also
References
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