Thesis defence in the University of Oulu

Doctoral Candidate

Master of Science Antti Moilanen

Faculty and research unit

University of Oulu Graduate School, Faculty of Biochemistry and Molecular Medicine, Protein and Structural Biology

Field of study

Biochemistry

Date and time of the thesis defence

15.2.2021 12:00

Place of the thesis defence

Leena Palotie auditorium 101A (Aapistie 5A). Remote access: https://oulu.zoom.us/j/67270476428?pwd=cEN3RTFJVktNYnNkelBRK1VEQ3BqZz09

Topic of the dissertation

Novel regulatory mechanisms and structural aspects of oxidative protein folding

Opponent

Professor Neil Bulleid, University of Glasgow

Custos

Professor Lloyd Ruddock, University of Oulu

Novel mechanisms of formation of protein structures

The basic unit of life, the cell, utilizes a great variety of molecules to sustain life. One such important molecule, with thousands of different types found in human cells, is protein. Proteins act in various biological roles, including formation of cellular structures, signaling within and between cells, as well as in immune system to protect against extracellular threats. Protein resembles beads on a string: it first forms a linear sequence of consecutive amino acid residues. To acquire biological function, protein must fold. During folding, amino acid residues start reacting with each other, and the linear chain compacts into a three-dimensional, often globular structure. In my doctoral research, I have studied chemical reactions of a specific amino acid, cysteine, which is involved in protein folding. Two cysteines can form a disulfide bond which stabilizes protein structure and may regulate the biological function of a protein. Together, disulfide formation and protein folding form a complex catalyzed process which must be aided by various cellular protein folding factors, including enzymes. I analyze the mechanism of action and interactions between such folding factors and their regulation to understand better, how cells form disulfides, fold proteins efficiently, and avoid folding mistakes. Industrial production of many important disulfide-containing proteins, including insulin and antibodies, is currently complicated and expensive due to the complexities connected to protein folding and disulfide bond formation. I hope that the results from this work will help solve those problems in the future.

Dissertation

Last updated: 8.2.2021