Journal of Microbiology

Alteration of chromosomal structure within β-Tubulin and flagellar calmodulin genes during differentiation of Naegleria gruberi Amebae into Flagellates: Bok, Jin Woong , Lee, Joo Hun; J. Microbiol. 1995;33(3):222-227.

Abstract: We have examined DNase I sensitivity of β-tubulin and flagellar calmodulin genes which are transiently and coordinately activated differentiation of Naegleria gruberi amebae into flagellates. The DNase I sensitivity of β-tubulin and flagellar calmodulin genes changed in parallel with the changes in transcriptional activity of the respective genes during differentiation. The two genes were resistant to DNase I inamebae stage when transcription of the two genes was inactive. Forty minutes after initiation of differentiation, when the two genes were most actively being transcribed, the two genes showed the highest sensitsivity to DNase I. One hundred and twenty minutes after initiation, the differentiation was completed and transcriptional activity of the two genes decreased to a low level. At this stage, the two genes were resistant to DNase I treatment like the ones at the ameba stage. This change in the DNase I sensitivity of the two genes was not observed when transcription of the two genes was blocked by adding cycloheximide at the beginning of differentiation.

Induced Level of CIN2 Gene Transcripts in yeast by Cycloheximide Treatment: Lee , Myeong Sok; J. Microbiol. 1995;33(1):46-50.

Abstract: The interrelationship of expression of the two adjacent genes, HSP82 and CIN2 in Saccharomyces cerevisiae was investigated. The two genes are very close each other, such that the poly(A) addition site of the HSP82 gene is likely to be immediately followed by the promoter region of the CIN2 gene. Thus, transcription of the upstream HSP82 gene might affect expression of the CIN2 gene via promoter occlusion. Based on HSP82 and CIN2 mRNA analysis of the wild type, disruption mutant of the HAP82 gene, and conditional RNA polymerase II mutant strains, I conclude that CIN2 transcription is not affected by HSP82 transcription. However, surprisingly the level of CIN2 gene transcripts, but not HSP82, is heightened by cycloheximide treatment, presumably due to an increase in its stability. No change is observed in kinetics of HSP82 RNA induction by cycloheximide treatment.

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