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2015 ; 24
(6
): 996-1003
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Selective observation of the disordered import signal of a globular protein by
in-cell NMR: the example of frataxins
#MMPMID25772583
Popovic M
; Sanfelice D
; Pastore C
; Prischi F
; Temussi PA
; Pastore A
Protein Sci
2015[Jun]; 24
(6
): 996-1003
PMID25772583
show ga
We have exploited the capability of in-cell NMR to selectively observe flexible
regions within folded proteins to carry out a comparative study of two members of
the highly conserved frataxin family which are found both in prokaryotes and in
eukaryotes. They all contain a globular domain which shares more than 50%
identity, which in eukaryotes is preceded by an N-terminal tail containing the
mitochondrial import signal. We demonstrate that the NMR spectrum of the
bacterial ortholog CyaY cannot be observed in the homologous E. coli system,
although it becomes fully observable as soon as the cells are lysed. This
behavior has been observed for several other compact globular proteins as seems
to be the rule rather than the exception. The NMR spectrum of the yeast ortholog
Yfh1 contains instead visible signals from the protein. We demonstrate that they
correspond to the flexible N-terminal tail indicating that this is flexible and
unfolded. This flexibility of the N-terminus agrees with previous studies of
human frataxin, despite the extensive sequence diversity of this region in the
two proteins. Interestingly, the residues that we observe in in-cell experiments
are not visible in the crystal structure of a Yfh1 mutant designed to destabilize
the first helix. More importantly, our results show that, in cell, the protein is
predominantly present not as an aggregate but as a monomeric species.