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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ford-hutchinson, A. W. Vaillancourt, J. P. Calaycay, J. R. Ali, A. Zamboni, R. J. Nicholson, D. W. Mumford, R. A. |
| Description | Author Affiliation: Nicholson DW ( Department of Pharmacology, Merck Frosst Centre for Therapeutic Research, Pointe Claire-Dorval, PQ, Canada.); |
| Abstract | Human leukotriene C4 (LTC4) synthase was purified > 25,000-fold to homogeneity from the monocytic leukemia cell line THP-1. Beginning with taurocholate-solubilized microsomal membranes, LTC4 synthase was chromatographically resolved by (i) anion exchange, (ii) affinity chromatography (through a resin of biotinylated LTC2 immobilized on streptavidin-agarose), and then (iii) gel filtration. The final preparation contained only an 18-kDa polypeptide. The molecular mass of the pure polypeptide was consistent with an 18-kDa polypeptide from THP-1 cell membranes that was specifically photolabeled by an LTC4 photoaffinity probe, 125I-labeled azido-LTC4. On calibrated gel-filtration columns, purified LTC4 synthase activity eluted at a volume corresponding to 39.2 +/- 3.3 kDa (n = 12). The sequence of the N-terminal 35 amino acids was determined and found to be a unique sequence composed predominantly of hydrophobic amino acids and containing a consensus sequence for protein kinase C phosphorylation. We therefore conclude that human LTC4 synthase is a glutathione S-transferase composed of an 18-kDa polypeptide that is enzymatically active as a homodimer and may be phosphoregulated in vivo. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 5 |
| Volume Number | 90 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1993-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Glutathione Transferase Isolation & Purification Amino Acid Sequence Cell Membrane Enzymology Chemistry In Vitro Techniques Lung Molecular Sequence Data Molecular Weight Tumor Cells, Cultured Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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