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Cloning and genetic characterization of a calcium‐ and phospholipid‐binding protein from Saccharomyces cerevisiae that is homologous to translation elongation factor‐1γ
Author(s) -
Kambouris Nicholas G.,
Burke Daniel J.,
Creutz Carl E.
Publication year - 1993
Publication title -
yeast
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.923
H-Index - 102
eISSN - 1097-0061
pISSN - 0749-503X
DOI - 10.1002/yea.320090206
Subject(s) - biology , saccharomyces cerevisiae , elongation factor , eukaryotic translation elongation factor 1 alpha 1 , ef tu , gtpase , biochemistry , genetics , mutant , gene , ribosome , translation (biology) , messenger rna , rna
We have isolated a gene ( CAM1 ) from the yeast Saccharomyces cerevisiae that encodes a protein homologous to the translational cofactor elongation factor‐1γ (EF‐1γ) first identified in the brine shrimp Artemia salina . The predicted Cam1 amino acid sequence consists of 415 residues that share 32% identity with the Artemia protein, increasing to 72% when conservative substitutions are included. The calculated M r of Cam1p (47 092 Da) is in close agreement with that of EF‐1γ (M r = 49 200 Da), and hydropathy plots of each protein exhibit strikingly similar profiles. Disruption of the CAM1 locus yields four viable meiotic progeny, indicating that under normal growth conditions the Cam1 protein is non‐essential. Attempts to elicit a translational phenotype have been unsuccessful. Since EF‐1γ participates in the regulation of a GTP‐binding protein (EF‐1α), double mutants with cam1 disruptions and various mutant alleles of known GTP‐binding proteins were constructed and examined. No evidence was found for an interaction of CAM1 with TEF1, TEF2, SEC4, YPT1, RAS1, RAS2, CDC6, ARF1, ARF2 or CIN4 . The possibility that Cam1p may play a redundant role in the regulation of protein synthesis or another GTP‐dependent process is discussed.