Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.4.21.69 (APC)
 16,337 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Prolactin-like protein C (PLP-C) is a member of the rat placental family of proteins which are structurally related to pituitary prolactin (PRL). In an effort to characterize the receptor specificity and biological activity of PLP-C, we used a PLP cDNA to express the recombinant protein in a bacterial system. The PLP-C cDNA was modified by oligonucleotide mutagenesis and ligated into a human carbonic anhydrase II (hCAII) expression vector. Following a single step affinity purification, the hCAII-PLP-C fusion protein was digested with enterokinase to release a 25 kDa protein. N-Terminal sequence analysis of the 25 kDa band demonstrated identity with PLP-C. A polyclonal antiserum to the fusion protein cross reacted with seven major proteins in rat placental culture media of which two were the native forms of PLP-C. Recombinant PLP-C was not mitogenic in the Nb2 lymphoma bioassay and did not exhibit high affinity binding to rat PRL receptor. The choice of hCA-II fusion allows for rapid purification of rPLP-C which will aid in further investigation of the biological role of PLP-C.
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PMID:Expression and characterization of recombinant rat placental prolactin-like protein C. 789 99

Polyserase-1 (polyserine protease-1)/TMPRSS9 (transmembrane serine protease 9) is a type II transmembrane serine protease (TTSP) that possesses unique three tandem serine protease domains. However, the physiological function of each protease domain remains poorly understood. We discovered a new splice variant of polyserase-1, termed Serase-1B, which contains 34 extra amino acids consisting a SEA module (a domain found in sea urchin sperm protein, enterokinase and agrin) adjacent to the transmembrane domain and the first protease domain with a mucin-like box at the C-terminus. The tissue distribution of this enzyme by RT (reverse transcription)-PCR analysis revealed high expression in the liver, small intestine, pancreas, testis and peripheral blood CD14+ and CD8+ cells. To investigate the role of Serase-1B, a full-length form recombinant protein was produced. Interestingly, recombinant Serase-1B was partly secreted as a soluble inactive precursor and it was also activated by trypsin. This activated enzyme selectively cleaved synthetic peptides for trypsin and activated protein C, and it was inhibited by several natural serine protease inhibitors, such as aprotinin, alpha2-antiplasmin and plasminogen activator inhibitor 1. In addition, Serase-1B efficiently converted pro-uPA (urokinase-type plasminogen activator) into active uPA and this activation was strongly inhibited by these natural inhibitors. Furthermore, this activation was also negatively regulated by glycosaminoglycans. Our results indicate that Serase-1B is a novel member of TTSPs that might be involved in uPA/plasmin-mediated proteolysis and possibly implicated in biological events such as fibrinolysis and tumour progression.
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PMID:Serase-1B, a new splice variant of polyserase-1/TMPRSS9, activates urokinase-type plasminogen activator and the proteolytic activation is negatively regulated by glycosaminoglycans. 1687 79