University of Illinois Urbana-Champaign

Regulatory Genes of the Bacteroides Conjugative Transposon, CTnDOT

Moon, Kyung

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Description

Title
Regulatory Genes of the Bacteroides Conjugative Transposon, CTnDOT
Author(s)
Moon, Kyung
Issue Date
2006
Doctoral Committee Chair(s)
Salyers, Abigail A.
Department of Study
Microbiology
Discipline
Microbiology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Biology, Molecular
Language
eng
Abstract
In order to examine which genes are responsible for excision, I first demonstrated that the excision genes orf2c, orf2d, orf3, and exc are part of an operon (the orf2c operon) and that this operon is regulated at the transcriptional level. I found that RteC is an DNA-binding activator of the orf2c operon and that RteA and RteB participate in excision by stimulating transcription of rteC. In order to determine whether CTnDOT regulatory genes can affect the expression of chromosomal genes in B. thetaiotaomicron , I used GeneChip and quantitative RT-PCR analyses. I showed that RteA and RteB are global regulators that induce the expression of various genes, in particular, tra genes in CTn, a cryptic CTn found in the chromosome. In addition, I characterized the repressor region, rteR, which regulates the expression of tra genes, using site-directed mutagenesis and Northern blot analysis. This region turned out to contain a small non-coding regulatory RNA that has been renamed as RteR. However, further work has to be done to examine its mechanism of action.
Graduation Semester
2006
Type of Resource
text
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