The physical interactions between p37(env-mos) and tubulin structures

W. Bai, B. Singh, Y. Yang, L. S. Ramagli, M. Nash, N. K. Herzog, R. B. Arlinghaus

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

The c-mos protein has been reported to be complexed with tubulin and to co-localize with microtubules in unfertilized Xenopus eggs as well as in NIH3T3 cells transformed by the Xenopus c-mos gene. We performed experiments to determine whether the viral mos protein, p37(v-mos), also associates with tubulin. Both mouse c-mos and v-mos proteins synthesized in vitro co-polymerized with tubulin. Upon incubation at 37°C, essentially all of the mos protein (both viral and cellular) co-polymerized with tubulin, while more than 50% of the tubulin remained in the depolymerized state. The mos-tubulin interaction was specific, as indicated by the insolubility of the v-mos protein following a second cycle of temperature-dependent depolymerization/polymerization. Beta-tubulin was shown to co-precipitate with p37(v-mos) and to be phosphorylated by the mos kinase in vitro. Although both v-mos and c-mos proteins co-polymerize with tubulin, p37(v-mos) behaved differently from p39(c-mos) on gel filtration columns under conditions that favor disassembly of microtubules. Like Xenopus c-mos, the bulk of the mouse c-mos protein synthesized in vitro appeared in structures that fractionate at about 500kDa. In contrast to c-mos, the majority of the v-mos protein, either isolated from stably transformed NIH3T3 cells or synthesized in vitro, eluted in the 100kDa fraction, cofractionating with tubulin dimers. Therefore, the v-mos protein appears to have a higher affinity for unpolymerized tubulin than c-mos, under conditions that favor disassembly of microtubules.

Original languageEnglish (US)
Pages (from-to)493-500
Number of pages8
JournalOncogene
Volume7
Issue number3
StatePublished - Jan 1 1992

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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    Bai, W., Singh, B., Yang, Y., Ramagli, L. S., Nash, M., Herzog, N. K., & Arlinghaus, R. B. (1992). The physical interactions between p37(env-mos) and tubulin structures. Oncogene, 7(3), 493-500.