TY - JOUR
T1 - Solution structure and refolding of the Mycobacterium tuberculosis pentapeptide repeat protein MfpA
AU - Khrapunov, Sergei
AU - Cheng, Huiyong
AU - Hegde, Subray
AU - Blanchard, John
AU - Brenowitz, Michael
PY - 2008/12/26
Y1 - 2008/12/26
N2 - The pentapeptide repeat is a recently discovered protein fold. Mycobacterium tuberculosis MfpA is a founding member of the pentapeptide repeat protein (PRP) family that confers resistance to the antibiotic fluoroquinolone by binding to DNA gyrase and inhibiting its activity. The size, shape, and surface potential of MfpA mimics duplex DNA. As an initial step in a comprehensive biophysical analysis of the role of PRPs in the regulation of cellular topoisomerase activity and conferring antibiotic resistance, we have explored the solution structure and refolding of MfpA by fluorescence spectroscopy, CD, and analytical centrifugation. A unique CD spectrum for the pentapeptide repeat fold is described. This spectrum reveals a native structure whose β-strands and turns within the right-handed quadrilateral β-helix that define the PRP fold differ from canonical secondary structure types. MfpA refolded from urea or guanidium by dialysis or dilution forms stable aggregates of monomers whose secondary and tertiary structure are not native. In contrast, MfpA refolded using a novel "time-dependent renaturation" protocol yields protein with native secondary, tertiary, and quaternary structure. The generality of "time-dependent renaturation" to other proteins and denaturation methods is discussed.
AB - The pentapeptide repeat is a recently discovered protein fold. Mycobacterium tuberculosis MfpA is a founding member of the pentapeptide repeat protein (PRP) family that confers resistance to the antibiotic fluoroquinolone by binding to DNA gyrase and inhibiting its activity. The size, shape, and surface potential of MfpA mimics duplex DNA. As an initial step in a comprehensive biophysical analysis of the role of PRPs in the regulation of cellular topoisomerase activity and conferring antibiotic resistance, we have explored the solution structure and refolding of MfpA by fluorescence spectroscopy, CD, and analytical centrifugation. A unique CD spectrum for the pentapeptide repeat fold is described. This spectrum reveals a native structure whose β-strands and turns within the right-handed quadrilateral β-helix that define the PRP fold differ from canonical secondary structure types. MfpA refolded from urea or guanidium by dialysis or dilution forms stable aggregates of monomers whose secondary and tertiary structure are not native. In contrast, MfpA refolded using a novel "time-dependent renaturation" protocol yields protein with native secondary, tertiary, and quaternary structure. The generality of "time-dependent renaturation" to other proteins and denaturation methods is discussed.
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U2 - 10.1074/jbc.M804702200
DO - 10.1074/jbc.M804702200
M3 - Article
C2 - 18977756
AN - SCOPUS:61349143151
SN - 0021-9258
VL - 283
SP - 36290
EP - 36299
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 52
ER -