Histidyl-tRNA synthetase, the myositis Jo-1 antigen, is cytoplasmic and unassociated with the cytoskeletal framework.
The myositis-specific anti-Jo-1 autoantibody, which is directed against histidyl-tRNA-synthetase, is found in 30% of polymyositis patients. The Jo-1 antigen has been reported to be a nuclear antigen by some authors. On the contrary we show that less than 2% of the total histidyl-tRNA and lysyl-tRNA synthetase activities are associated with purified rat liver nuclei or the hepatocyte intermediate filament-nuclear fraction. In the presence of polyethylene glycol, in which the high Mr multi-enzyme complex containing lysyl-tRNA synthetase is insoluble, 65% of the lysyl-tRNA synthetase and only 15% of histidyl-tRNA synthetase activities remained associated with the cytoskeletal framework. The Jo-1 antigen exhibited a diffuse granular cytoplasmic distribution in cultured rat hepatocytes as determined by indirect immunofluorescent microscopy. Hence, the Jo-1 antigen is cytoplasmic and unassociated with the cytoskeletal framework or high Mr synthetase complex in situ.[1]References
- Histidyl-tRNA synthetase, the myositis Jo-1 antigen, is cytoplasmic and unassociated with the cytoskeletal framework. Dang, C.V., LaDuca, F.M., Bell, W.R. Exp. Cell Res. (1986) [Pubmed]
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