The role of the N-terminal tail for the oligomerization, folding and stability of human frataxin.

ABSTRACT: The N-terminal stretch of human frataxin (hFXN) intermediate (residues 42-80) is not conserved throughout evolution and, under defined experimental conditions, behaves as a random-coil. Overexpression of hFXN56-210 in Escherichia coli yields a multimer, whereas the mature form of hFXN (hFXN81-210) is monomeric. Thus, cumulative experimental evidence points to the N-terminal moiety as an essential element for the assembly of a high molecular weight oligomer. The secondary structure propensity of peptide 56-81, the moiety putatively responsible for promoting protein-protein interactions, was also studied. Depending on the environment (TFE or SDS), this peptide adopts α-helical or β-strand structure. In this context, we explored the conformation and stability of hFXN56-210. The biophysical ch

SUBMITTER: Faraj SE 

PROVIDER: S-EPMC3741918 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature