Divergence and conservation of SUP2 (SUP35) gene of yeast Pichia pinus and Saccharomyces cerevisiae

Yeast. Nov-Dec 1990;6(6):461-72. doi: 10.1002/yea.320060603.


SUP2 (SUP35) is an omnipotent suppressor gene, coding for an EF-1 alpha-like protein factor, intimately involved in the control of translational accuracy in yeast Saccharomyces cerevisiae. In the present study a SUP2 gene analogue from yeast Pichia pinus was isolated by complementation of the temperature-sensitive sup2 mutation of S. cerevisiae. The nucleotide sequence of the SUP2 gene of P. pinus codes for a protein of 82.4 kDa, exceeding the Sup2 protein of S. cerevisiae by 6 kDa. Like the SUP2 gene product of S. cerevisiae, the Sup2 protein of P. pinus represents a fusion of a unique N-terminal part and a region homologous to EF-1 alpha. The comparison of amino acid sequences of the Sup2 proteins reveals high conservation (76%) of the C-terminal region and low conservation (36%) of the N-terminal part where, in addition, the homologous correspondence is ambiguous. Proteins related to the Sup2 of S. cerevisiae were found in P. pinus and some other yeast species by the immunoblotting technique. The relation between the evolutionary conservation of different regions of the Sup2 protein and their functional significance is discussed.

MeSH terms

  • Amino Acid Sequence
  • Base Sequence
  • Cloning, Molecular
  • Codon / genetics
  • DNA, Fungal / genetics
  • Fungal Proteins / analysis
  • Fungal Proteins / genetics*
  • Genes, Suppressor*
  • Immunoblotting
  • Molecular Sequence Data
  • Peptide Termination Factors
  • Pichia / genetics*
  • Plasmids
  • Prions*
  • Repetitive Sequences, Nucleic Acid
  • Restriction Mapping
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae Proteins*
  • Sequence Alignment
  • Sequence Homology, Nucleic Acid
  • Transcription, Genetic
  • Transformation, Genetic


  • Codon
  • DNA, Fungal
  • Fungal Proteins
  • Peptide Termination Factors
  • Prions
  • SUP35 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins