Interaction of renalase and its peptides RP211-223 and RP224-232 with the mitochondrial fraction of rat brain: a link to neurodegeneration?

Renalase (RNLS) is a protein exhibiting various functions inside and outside cells. A series of synthetic peptides, corresponding to the fragments of the RNLS amino acid sequence, may reproduce the effects of the full-length RNLS. In this study we have investigated the interaction of proteins in the mitochondrial brain fraction of rats with the full-length RNLS and its peptides RP211-223 (peptide 1) and RP224-232 (peptide 2) immobilized on CNBr-activated Sepharose. Proteomic profiles of proteins bound to the full-length RNLS and its peptide RP211-223 were significantly different, whereas RP224-232 bound a small number of proteins (6), similar to those bound to the full-length RNLS. However, most proteins bound to RNLS and its peptides were multifunctional and associated with neurodegenerative pathology (Alzheimer's and Parkinson's diseases, etc.).