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- W2070135824 abstract "As co-chaperones of Hsp90 (heat-shock protein 90), FKBP51 (FK506-binding protein of 51 kDa) and FKBP52 (FK506-binding protein of 52 kDa) act as antagonists in regulating the hormone affinity and nuclear transport of steroid receptor complexes. Exchange of Leu119 in FKBP51 for Pro119 in FKBP52 has been shown to largely reverse the steroid receptor activities of FKBP51 and FKBP52. To examine whether differences in conformational dynamics/plasticity might correlate with changes in the reported receptor activities, 15N-NMR relaxation measurements were carried out on the N-terminal FKBP domains of FKBP51 and FKBP52 as well as their residue-swapped variants. Both proteins exhibit a similar pattern of motion in the picosecond–nanosecond timeframe as well as a small degree of 15N line-broadening, indicative of motion in the microsecond–millisecond timeframe, in the β3a strand of the central sheet. Only the FKBP51 domain exhibits much larger line-broadening in the adjacent β3 bulge (40′s loop of FKBP12) and throughout the long β4–β5 loop (80′s loop of FKBP12). The L119P mutation at the tip of the β4–β5 loop completely suppressed the line-broadening in this loop while partially suppressing the line-broadening in the neighbouring β2 and β3a strands. The complementary P119L and P119L/P124S variants of FKBP52 yielded similar patterns of line-broadening for the β4–β5 loop as that for FKBP51, although only 20% and 60% as intense respectively. However, despite the close structural similarity in the packing interactions between the β4–β5 loop and the β3a strand for FKBP51 and FKBP52, the line-broadening in the β3a strand is unaffected by the P119L or P119L/P124S mutations in FKBP52." @default.
- W2070135824 created "2016-06-24" @default.
- W2070135824 creator A5034713571 @default.
- W2070135824 creator A5053018468 @default.
- W2070135824 creator A5058669502 @default.
- W2070135824 date "2014-06-13" @default.
- W2070135824 modified "2023-10-03" @default.
- W2070135824 title "Differential conformational dynamics in the closely homologous FK506-binding domains of FKBP51 and FKBP52" @default.
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- W2070135824 doi "https://doi.org/10.1042/bj20140232" @default.
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