University of Illinois at Chicago
BAI-DISSERTATION-2018.pdf (6.26 MB)
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Roles of ComW, HPF and YhaM in Competence Regulation in Streptococcus pneumoniae

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posted on 2018-07-25, 00:00 authored by Junqin Bai
This dissertation concentrates on determining how three competence-specific proteins—ComW, HPF, and YhaM—regulate competence development induced by competence-stimulating peptides in Streptococcus pneumoniae. The first dissertation study on the interaction between ComW and SigX, the only alternative sigma factor, suggests a mechanism in which ComW acts to promote SigX access to core RNAP in factor switching during transformation. In the second study, marinerT7 transposon mutagenesis and pGh9::ISS1 were used to screen ∆comW suppressor mutations. Lastly, HPF and YhaM mechanisms in protein expression pattern during competence were studied using pulse-chase labeling and 1-D and 2-D gel electrophoresis. Protein expression patterns in the ∆Hpf∆yhaM mutant were found locally but not globally different from those in the wild type on 2D-PAGE.



Morrison, Donald A


Okkema, Peter G


Biological Sciences

Degree Grantor

University of Illinois at Chicago

Degree Level

  • Doctoral

Committee Member

Freitag, Nancy E Polikanov, Yury Federle, Michael J

Submitted date

May 2018

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