In South Africa, most graduate coursework ends at the B.Sc. Honours level. I teach lectures on proteomics (available at
https://www.youtube.com/c/DavidTabb). At Stellenbosch University, my students can specialize in proteomics, though their degrees will be "Molecular Biology and Human Genetics" or "Bioinformatics and Computational Biology." Many professors in the world could host you for such a Ph.D. Which country is the best option for you?
--DT