Structure, evolution and expression of the mitochondrial ADP/ATP translocator gene from Chlamydomonas reinhardtii
1993
Sharpe, J.A. | Day, A.
The first AUG in the Chlamydomonas reinhardtii ADP/ATP translocator (CRANT) mRNA initiates an open reading frame (ORF) which is very similar (51-79% amino acid identity) to other ANT proteins. In contrast to higher plants, no evidence for a long amino-terminal extension was obtained. The 5' non-transcribed region of the single-copy CRANT gene contains sequence motifs present in other C. reinhardtii nuclear genes. Four introns, whose positions are not conserved in other ANT genes, interrupt the protein coding region. A short heat shock specifically reduces CRANT mRNA levels. CRANT mRNA levels were unaffected by a mutation in photosynthesis. In a dark/light regime CRANT mRNA levels are high in the dark phase and low in the early light phase. Data on translation initiation sites, splice junctions and the codon preferences of C. reinhardtii nuclear genes were compiled. With the exception of two rare codons, ACA and GGA, the CRANT gene exhibits the biased codon usage of C. reinhardtii nuclear genes that are highly expressed during normal vegetative growth.
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