Biochemistry, Biophysics, and Structural Biology Commons^™

Methionine-R-Sulfoxide Reductases And Biological Importance Of Free Methionine Sulfoxide Reduction, Byung Cheon Lee

Department of Biochemistry: Dissertations, Theses, and Student Research

We identified and functionally characterized yeast fRMsr homolog which showed specificity for reduction of free Met-R-SO and contributed to oxidative stress resistance of yeast cells. We further identified three conserved Cys which participate in catalysis through disulfide exchange. Evolutionary analyses revealed that the occurrence of fRMSr is restricted to unicellular organisms. We further found that mammalian MsrA can reduce free Met-S-SO, whereas MsrBs do not reduce free Met-R-SO. Consistent with these findings and the lack of fRMsr, mammalian cells could not grow in media that replaced Met with Met-R-SO. However, they grew in the presence of free Met-S-SO, which was …

Consequences Of Hyaluronan Metabolism On Cell Cycle Progression In Prostate Tumor Growth And Metastasis, Alamelu G. Bharadwaj

Department of Biochemistry: Dissertations, Theses, and Student Research

Progression of Prostate cancer (CaP), depends on a complex series of interactions between the tumor and extracellular matrix (ECM) leading to tumor growth and metastasis. Hyaluronan (HA), an ECM component, is elevated in CaP and its accumulation in the tumor microenvironment is dependent on its synthetic enzyme, hyaluronan synthase (HAS), and turnover enzyme, hyaluronidase (Hyal). Although Hyal1 expression can independently prognosticate CaP, and HAS expression shows increase in aggressive prostate cancer cells, the functional relevance of this correlation is unexplored. In these studies we aim to dissect the roles of HAS and Hyal1 in prostate cancer.

Stably overexpressed hyaluronan synthases …

Identification And Characterization Of A Cadmium-Transporting P-Type Atpase In Yeast Saccharomyces Cerevisiae, David J. Adle

Department of Biochemistry: Dissertations, Theses, and Student Research

Detoxification and homeostatic acquisition of metal ions are vital for all living organisms. Non-physiological heavy metals are toxic at low concentrations and represent major environmental hazards to human health. In particular, cadmium is a toxic environmental pollutant linked to a number of ailments including cancer, kidney and bone disease and reproductive disorders. The biological effects of cadmium toxicity which lead to human disease and the cellular mechanisms for cadmium defense are ill defined. Thus, the study of heavy metal detoxification systems represents an important research avenue to help combat cadmium related disorders.

The goal of this research project was to …

Structural Basis Of Allosteric And Intrasteric Regulation In Human Cystathionine Β-Synthase And Its Regulation By A Cxxc Motif, Suvajit Sen

Department of Biochemistry: Dissertations, Theses, and Student Research

The human cystathionine β-synthase (CBS) is a 5’ pyridoxal phosphate (PLP) dependent protein that catalyzes the condensation reaction between serine and homocysteine to yield cystathionine. This is the first step in the transsulfuration pathway which connects the methionine cycle to cysteine production. Mutations in CBS are the single most common cause of severe hereditary hyperhomocystenemia and over one hundred pathogenic mutations have been described so far. These mutations represent residues which are important for the structural and functional integrity of the enzyme. The biochemical characterization of these mutants thus leads to further insights into structure-function correlations in CBS.

CBS has …

Studies On Nutritional Muscular Dystrophy. I. Dietary Factors, Ii. Fibrosis And Lipomatosis Of Tissues, Violet Myrtle Wilder

Department of Biochemistry: Dissertations, Theses, and Student Research

Dissertation published as three peer-reviewed papers:

Sergius Morgulis, Violet M. Wilder, and S. H. Eppstein. (September 1938). Further studies on dietary factors associated with nutritional muscular dystrophy. Journal of Nutrition 16(3): 219-227.

Howard C. Spencer, Sergius Morgulis, and Violet M. Wilder. (August 1937). A micromethod for the determination of gelatin and a study of the collagen content of muscles from normal and dystrophic rabbits. Journal of Biological Chemistry 120(1): 257-266.

Sergius Morgulis, Violet M. Wilder, Howard C. Spencer, and S. H. Eppstein. (August 1938). Studies on the lipid content of normal and dystrophic rabbits. Journal of Biological Chemistry 124(3): 755-766.