Abstract:
:Previous studies have shown that the yeast Candida albicans encodes a unique seryl-tRNA(CAG) that should decode the leucine codon CUG as serine. However, in vitro translation of several different CUG-containing mRNAs in the presence of this unusual seryl-tRNA(CAG) result in an apparent increase in the molecular weight of the encoded polypeptides as judged by SDS-PAGE even though the molecular weight of serine is lower than that of leucine. A possible explanation for this altered electrophoretic mobility is that the CUG codon is decoded as modified serine in vitro. To elucidate the nature of CUG decoding in vivo, a reporter system based on the C. albicans gene (RBP1) encoding rapamycin-binding protein (RBP), coupled to the promoter of the C. albicans TEF3 gene, was utilized. Sequencing and mass-spectrometry analysis of the recombinant RBP expressed in C. albicans demonstrated that the CUG codon was decoded exclusively as serine while the related CUU codon was translated as leucine. A database search revealed that 32 out of the 65 C. albicans gene sequences available have CUG codons in their open reading frames. The CUG-containing genes do not belong to any particular gene family. Thus the amino acid specified by the CUG codon has been reassigned within the mRNAs of C. albicans. We argue here that this unique genetic code change in cellular mRNAs cannot be explained by the 'Codon Reassignment Theory'.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Santos MA,Tuite MFdoi
10.1093/nar/23.9.1481subject
Has Abstractpub_date
1995-05-11 00:00:00pages
1481-6issue
9eissn
0305-1048issn
1362-4962pii
5w0025journal_volume
23pub_type
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