Requirement of protein co-factor for the DNA-binding function of the human ski proto-oncogene product. |
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| Authors: | T Nagase G Mizuguchi N Nomura R Ishizaki Y Ueno and S Ishii |
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| Affiliation: | Tsukuba life Science Center, Institute of Physical and Chemical Research (RIKEN), Ibaraki, Japan. |
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| Abstract: | We identified the human c-ski gene product (c-Ski) as a protein with the apparent molecular weight of 100,000, p100c-ski, by using a c-Ski-specific polyclonal antibody. p100c-ski was a nuclear protein and p100c-ski in nuclear extracts of Molt4 cells bound to calf thymus DNA cellulose, but the bacterially synthesized c-Ski did not, suggesting that Ski was associated with another protein(s) and that the Ski complex had DNA-binding activity. This hypothesis was supported by the finding that the bacterially synthesized Ski bounds to DNA cellulose after being mixed with a nuclear extract of Molt4 cells. By use of a series of deletion mutants of Ski synthesized in an in vitro translation system, two portions in Ski were found to be necessary for the DNA binding of the Ski complex: the N-proximal portion containing a cystein/histidine-rich domain and the C-terminal portion including a region rich in basic amino acids. |
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