Darkness and antibiotics increase the steady-state transcripts of the elongation factor gene (tuf) in Chlamydomonas reinhardtii.
A plasmid library of chloroplast (Cp) DNA from Chlamydomonas reinhardtii was used to screen for transcripts which respond to light. A transcript of R03, a 1,300 bp EcoRI fragment, was identified as a message which accumulates in darkness. The transcribed region of R03 showed extensive sequence homology with the Escherichia coli elongation factor gene, tufA. A gene-specific probe was constructed. Northern blots were used to study the extent and kinetics of accumulation of this transcript in darkness and in the presence of antibiotic inhibitors of Cp ribosomes. For comparison, the effects of darkness and antibiotics on the steady state levels of psbA, rbcL, and 16S rRNA were also studied. We conclude that the tuf transcript shows the greatest increase in darkness and in the presence of antibiotics.
Silk
G W
GW
Department of Biological Sciences, University of Maryland Baltimore County, Catonsville 21228.
Wu
M
M
D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D015152:Blotting, Northern; D002453:Cell Cycle; D002696:Chlamydomonas / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D002701:Chloramphenicol / Q000494:pharmacology; D002736:Chloroplasts; D004247:DNA / Q000235:genetics; D015246:Deoxyribonuclease EcoRI; D008027:Light; D009693:Nucleic Acid Hybridization; D010444:Peptide Elongation Factor Tu / Q000235:genetics*; D012313:RNA / Q000235:genetics; D015347:RNA Probes; D012336:RNA, Ribosomal, 16S / Q000187:drug effects / Q000235:genetics / Q000528:radiation effects; D013307:Streptomycin / Q000494:pharmacology; D013698:Templates, Genetic; D014158:Transcription, Genetic
D000900:Anti-Bacterial Agents; D015347:RNA Probes; D012336:RNA, Ribosomal, 16S; D012313:RNA; D002701:Chloramphenicol; D004247:DNA; D015246:Deoxyribonuclease EcoRI; D010444:Peptide Elongation Factor Tu; D013307:Streptomycin