Transcriptional regulation of the gene encoding gamma-glutamylcysteine synthetase from the fission yeast Schizosaccharomyces pombe.
Transcriptional regulation of the Schizosaccharomyces pombe gamma-glutamylcysteine synthetase (GCS) gene was examined using the two GCS-lacZ fusion plasmids pUGCS101 and pUGCS102, which harbor 607 bp and 447 bp upstream regions, respectively. The negatively-acting sequence was located in the -607 approximately -447 bp upstream region of the GCS gene. The upstream sequence responsible for induction by menadione (MD) and L-buthionine-(S, R)-sulfoximine (BSO) resides in the -607 approximately -447 bp region, whereas the sequence which codes for nitric oxide induction is located within the -447 bp region, measured from the translational initiation point. Carbon source-dependent regulation of the GCS gene appeared to be dependent on the nucleotide sequence within -447 bp region. The transcription factor Pap1 is involved in the induction of the GCS gene by MD and BSO, but not by nitric oxide. Induction of the GCS gene occurring due to low glucose concentration does not depend on the presence of Pap1. These data imply that induction by MD and BSO may be mediated by the Pap1 binding site, probably located in the -607 approximately -447 region, and also that the nitric oxide-mediated regulation of the S. pombe GCS gene may share a similar mechanism with its carbon-dependent induction.
Kim
Su-Jung
SJ
Division of Life Sciences, Kangwon National University, Chuncheon 200-701, Korea.
Kim
Hong-Gyum
HG
Kim
Byung-Chul
BC
Kim
Kyunghoon
K
Park
Eun-Hee
EH
Lim
Chang-Jin
CJ
D050976:Basic-Leucine Zipper Transcription Factors; D004268:DNA-Binding Proteins / Q000378:metabolism; D005656:Fungal Proteins / Q000378:metabolism; D015966:Gene Expression Regulation, Fungal; D005721:Glutamate-Cysteine Ligase / Q000235:genetics* / Q000378:metabolism; D000073718:Pancreatitis-Associated Proteins; D012568:Schizosaccharomyces / Q000201:enzymology* / Q000235:genetics / Q000254:growth & development; D029702:Schizosaccharomyces pombe Proteins / Q000235:genetics / Q000378:metabolism; D014158:Transcription, Genetic
D050976:Basic-Leucine Zipper Transcription Factors; D004268:DNA-Binding Proteins; D005656:Fungal Proteins; D000073718:Pancreatitis-Associated Proteins; C105096:Pap1 protein, S pombe; C000612141:REG3A protein, human; D029702:Schizosaccharomyces pombe Proteins; D005721:Glutamate-Cysteine Ligase