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- Title
Two distinct cytokines released from a human aminoacyl-tRNA synthetase.
- Authors
Wakasugi, K; Schimmel, P
- Abstract
Aminoacyl-tRNA synthetases catalyze aminoacylation of transfer RNAs (tRNAs). It is shown that human tyrosyl-tRNA synthetase can be split into two fragments with distinct cytokine activities. The endothelial monocyte-activating polypeptide II-like carboxy-terminal domain has potent leukocyte and monocyte chemotaxis activity and stimulates production of myeloperoxidase, tumor necrosis factor-alpha, and tissue factor. The catalytic amino-terminal domain binds to the interleukin-8 type A receptor and functions as an interleukin-8-like cytokine. Under apoptotic conditions in cell culture, the full-length enzyme is secreted, and the two cytokine activities can be generated by leukocyte elastase, an extracellular protease. Secretion of this tRNA synthetase may contribute to apoptosis both by arresting translation and producing needed cytokines.
- Publication
Science (New York, N.Y.), 1999, Vol 284, Issue 5411, p147
- ISSN
0036-8075
- Publication type
Journal Article
- DOI
10.1126/science.284.5411.147