Human ubiquitin-activating enzyme (E1): Compensation for heat-labile mouse E1 and its gene localization on the X chromosome

  • Kudo M
  • Sugasawa K
  • Hori T
 et al. 
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We have constructed interspecific somatic cell hybrids between a temperature-sensitive (ts) mutant cell line of mouse FM3A cells, ts85, that has a heat-labile ubiquitin-activating enzyme (E1) and a human diploid fibroblast cell line, IMR-90. A hybrid clone that could grow stably at a nonpermissive temperature (39 °C) was obtained. Segregation of the hybrid cells at a permissive temperature (33 °C) gave rise to temperature-sensitive clones. The electrophoresis of extracted histones and karyotype analysis of the segregants revealed a close correlation of the ability to grow at 39 °C, the presence of uH2A (ubiquitin-H2A semihistone) at 39 °C, and the presence of the human X chromosome. One of the hybrid clones that could grow at the nonpermissive temperature contained the X chromosome as the only human chromosome. The sodium dodecyl sulfate-polyacrylamide gel electrophoretic pattern of affinity-purified E1 showed that this hybrid clone contained both human and mouse type E1. Thus we conclude that the functional gene for human E1 is located on the X chromosome. © 1991.

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