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The Role Of The Mcm2 Subunit In Regulating The Activities Of The Mcm2-7 Helicase, Brent E. Stead
The Role Of The Mcm2 Subunit In Regulating The Activities Of The Mcm2-7 Helicase, Brent E. Stead
Electronic Thesis and Dissertation Repository
The transmission of genetic information from parental to daughter cells requires the faithful duplication of an organism’s genome. Uncontrolled DNA replication can result in proliferative diseases, such as cancer. DNA replication requires a single-stranded DNA template to be produced from duplex DNA. In eukaryotes, DNA unwinding for replication is performed by the heterohexameric replicative helicase complex comprised of the minichromosome maintenance proteins 2 through 7.
Each of the Mcm2-7 subunits likely has a unique role in DNA binding and unwinding by the Mcm2-7 complex. The present study examines the role of the Saccharomyces cerevisiae Mcm2 subunit in regulating the activities …
Identification Of Regions Responsible For The Open Conformation Of S100a10 Using Chimaeric S100a11/S100a10 Proteins, Liliana Santamaria-Kisiel
Identification Of Regions Responsible For The Open Conformation Of S100a10 Using Chimaeric S100a11/S100a10 Proteins, Liliana Santamaria-Kisiel
Electronic Thesis and Dissertation Repository
S100A11 is a dimeric, EF-hand calcium-binding protein. Calcium binding to S100A11 results in a large conformational change that uncovers a broad hydrophobic surface used to interact with phospholipid-binding proteins (annexins A1 and A2), and facilitate membrane vesiculation events. In contrast to other S100 proteins, S100A10 is unable to bind calcium due to deletion and substitution of calcium-ligating residues. Despite this, calcium-free S100A10 assumes an “open” conformation that is very similar to S100A11 in its calcium-bound state (Ca2+-S100A11). To understand how S100A10 is able to adopt an open conformation in the absence of calcium, seven chimeric proteins were constructed where regions …
Structural Insights Into Dna Replication And Lesion Bypass By Y Family Dna Polymerases, Kevin N. Kirouac
Structural Insights Into Dna Replication And Lesion Bypass By Y Family Dna Polymerases, Kevin N. Kirouac
Electronic Thesis and Dissertation Repository
Y family DNA polymerases are specialized enzymes for replication through sites of DNA damage in the genome. Although the DNA damage bypass activity of these enzymes is important for genome maintenance and integrity, it is also responsible for DNA mutagenesis due to the error-prone nature of the Y family. Understanding how these enzymes select incoming nucleotides during DNA replication will give insight into their role in cancer formation, aging, and evolution. This work attempts to mechanistically explain, primarily through X-ray crystallography and enzymatic activity assays, how Y family polymerases select incoming nucleotides in various DNA replication contexts. Initially, we sought …
Mitotic Regulation Of Protein Kinase Ck2, Nicole A. St. Denis
Mitotic Regulation Of Protein Kinase Ck2, Nicole A. St. Denis
Electronic Thesis and Dissertation Repository
Protein kinase CK2 is a serine/threonine kinase with a multitude of substrates and roles in many cellular processes, including mitosis. CK2 is constitutively active, yet we hypothesize that CK2 is indeed regulated in mitosis through subtle means, enabling CK2 to perform its functions unique to cell division. Our aims were to examine the roles of mitotic phosphorylation, subcellular localization, and interplay with mitotic kinases in the regulation of CK2 activity.
We first examined the role of four highly conserved mitotic phosphorylation sites located in the unique C-terminus of CK2α. Phosphospecific antibodies generated against the sites show that CK2α phosphorylation is …