The novel recombinant hirudin, r-RGD-hirudin, inhibits thrombin and platelet aggregation. Here, we reported over-expression of 15N-labeled r-RGD-hirudin by Pichia pastoris in minimal medium. After extensive optimization, the yield of active r-RGD-hirudin reached ~600 mg/L when the yeast cells were cultured in a fermenter. The purified 15N-labeled r-RGD-hirudin retained full biological activity and was uniformly labeled. Heteronuclear NMR of the 15N-labeled r-RGD-hirudin was performed for the first time, and all signals in the heteronuclear single quantum coherence (HSQC) spectrum were successfully assigned.
Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.