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SUP2(SUP35) is an omnipotent suppressor gene, coding for an EF-1 alpha-like protein factor, involved in the control of translational accuracy in yeast Saccharomyces cerevisiae. A SUP2 gene analogue from yeast Pichia pinus was isolated by complementation of temperature-sensitive sup2 mutation of S. cerevisiae. Nucleotide sequence of the SUP2 gene of P. pinus codes for a protein of 82.4 kDa exceeding the SUP2 protein of S. cerevisiae for 6 kDa. The SUP2 gene product of P. pinus is similar to the Sup2 protein of S. cerevisiae by its structure and includes a highly conservative (76%) C-terminal region homologus to EF-1 alpha and a lowly conservative N-terminal region. The relation between the evolutionary conservativity of different regions of the Sup2 protein and their functional significance is discussed.
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