| First Author | Chu W | Year | 1992 |
| Journal | Biochim Biophys Acta | Volume | 1121 |
| Issue | 1-2 | Pages | 83-7 |
| PubMed ID | 1376147 | Mgi Jnum | J:1144 |
| Mgi Id | MGI:49676 | Doi | 10.1016/0167-4838(92)90340-j |
| Citation | Chu W, et al. (1992) Molecular cloning and characterization of mouse mast cell chymases. Biochim Biophys Acta 1121(1-2):83-7 |
| abstractText | Mouse mast cell chymases are granule-associated serine proteinases with chymotrypsin-like substrate specificities. cDNAs for two new chymases were isolated from a cDNA library constructed using mRNA from ABFTL-6 mouse mast cells by screening with a rat mast cell proteinase cDNA. The deduced amino acid sequence of mouse chymase 1 consists of a 226 amino acid catalytic portion and a 21 amino acid preprosequence. Chymase 1 is unusual in that an Asn occurs in the substrate binding pocket, a feature that has not been observed in any other serine proteinase. Also, chymase 1 is expected to have a large positive charge (+13) at physiological pH. A partial cDNA for chymase 2 encodes 177 residues of the carboxy terminal portion of a second proteinase distinct from chymase 1. Chymase 2 cDNA contains a highly conserved intron/exon junction, a high positive charge (+17) and a novel, second potential N-glycosylation site. Transcripts for both chymases are found in ABFTL-6 mast cells, but only chymase 2 mRNA is in mouse connective tissue mast cells. These data suggest that these chymases have distinct enzymatic properties and tissue-specific patterns of gene expression. |
