Master of Science in Biochemistry and Molecular Biology (MSc) postgraduate personal statement example

Personal statement example

The first protein I tried to purify on my own ended up as a pale, rubbery pellet at the bottom of a centrifuge tube. My final-year project was to express a His-tagged dehydrogenase in E. coli and characterise its kinetics, but for the first five weeks almost all of it formed inclusion bodies. I tested induction at lower temperatures, reduced the IPTG concentration and tried a different strain. On SDS-PAGE gels, a faint band slowly moved into the soluble fraction. Overnight expression at 18 °C gave me enough protein for nickel affinity purification. I then measured NADH production at 340 nm, fitted Michaelis–Menten curves and compared my estimates with those of a labmate who had used a slightly different buffer. My supervisor described the result as a modest characterisation, and that is accurate. I learned more from those weeks than from any lecture, because each variable I changed showed me how closely protein folding depends on the conditions a cell provides.

The project led me back to my coursework with better questions. In structural biology, I had memorised the idea that sequence determines structure. At the bench, I saw that a correct sequence still depends on chaperones, temperature and expression rate. I read parts of Branden and Tooze's Introduction to Protein Structure to understand how domains assemble. I also used AlphaFold models of my enzyme to see whether the predicted disordered N-terminal region might explain its tendency to aggregate. I could not test that idea within the project. It is still the kind of question I would like to pursue properly at master's level: how folding, stability and function are linked, and how expression systems can be adjusted to reveal that relationship.

Since graduating I have worked as a laboratory assistant in a hospital pathology department. My role is routine but responsible. I receive and log samples, prepare reagents, load analysers and keep the paperwork that makes each result traceable. Seeing thousands of samples has made me careful about labelling, cold-chain handling and documentation. In a research setting I have sometimes treated these as tasks to finish before the real work begins. In a clinical laboratory, a mislabelled tube is not a minor inconvenience. I now keep my own notebooks to the same standard. I have also come to admire how quality control is built into every run, and I would like to bring that discipline to longer experiments where errors can stay hidden for weeks.

Outside work I volunteer once a month at a local repair café, mostly fixing lamps, kettles and the occasional sewing machine. It has nothing to do with biochemistry. It has, though, taught me to explain a fault plainly to someone anxious about losing a treasured object, and to admit when something cannot be saved. I also swim three mornings a week before shifts. That routine has done more for my concentration during long gel runs than any productivity method I have tried.

I am applying for a research master's because I want sustained time on one problem, with the independence to design experiments rather than follow a protocol already written. I am particularly interested in protein expression, folding and enzyme mechanism. I am also keen to gain experience with techniques I have only read about, such as circular dichroism, differential scanning fluorimetry and crystallography. I know a two-year project will involve more failed preparations than successful ones. My dissolved pellet was a small victory, but it showed me that I enjoy the patient, methodical work that leads to understanding. I would like to develop that into the skills of an independent researcher, and in time I hope to work in academic or industrial protein science.