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J. Bacteriol., Nov 1995, 6077-6082, Vol 177, No. 21
E Conway de Macario and AJ Macario
Transcription of the archaeal trkA gene homolog in Methanosarcina mazei S-6
was studied at the optimal growth temperature of 37 degrees C and after
heat shock at 45 degrees C. Northern (RNA) blotting results (transcript
size) and data from primer extension experiments to map the transcription
initiation site indicate that trkA is cotranscribed with another gene. The
latter, orf11, encodes a protein of 94 amino acids (10,611 Da) and is
located upstream of trkA, with which it overlaps: the translation stop
codon of orf11, TGA, shares the bases T and G with the translation start
codon of trkA, ATG. These genes' transcription was decreased by heat shock
to the point of making the transcript undetectable by Northern or dot
blotting procedures. orf11 and trkA differ in codon usage patterns, and the
proteins coded by them, i.e., Orf11 and TrkA, are dissimilar in amino acid
sequence and composition.
Copyright © 1995, American Society for Microbiology
Transcription of the archaeal trkA homolog in Methanosarcina mazei S-6
Wadsworth Center, Division of Molecular Medicine, New York State Department of Health, Albany 12201-0509, USA.
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