Liver-type fatty acid binding protein interacts with hepatocyte nuclear factor 4α.

Liver-type fatty acid binding protein interacts with hepatocyte nuclear factor 4α.
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DOI:
10.1016/j.febslet.2013.09.043
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发表时间:
2013-11-29
期刊:
影响因子:
3.5
通讯作者:
Schroeder F
Schroeder F
中科院分区:
生物学3区
文献类型:
--
作者:
McIntosh AL;Petrescu AD;Hostetler HA;Kier AB;Schroeder F

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肝细胞核因子4α(HNF4α)调节肝型脂肪酸结合蛋白(HNF4 FABP)基因表达。相反,如本文所示,L-FABP在结构和功能上也与HNF4α相互作用。荧光共振能量转移(FRET)和荧光共振能量转移(FRET)检测到L-FABP与HNF4α的亲和力接近(~80),与高亲和力的Kd~250-300 nm结合。圆二色谱(CD)表明,HNF4FABP/L-α相互作用改变了蛋白质的二级结构。最后,L-FABP增强了HNF4α在COS7细胞中的反式激活。综上所述,这些数据表明,L-FABP为核内HNF4α的激活提供了一条信号通路。
Hepatocyte nuclear factor 4α (HNF4α) regulates liver type fatty acid binding protein (L-FABP) gene expression. Conversely as shown herein, L-FABP structurally and functionally also interacts with HNF4α. Fluorescence resonance energy transfer (FRET) between Cy3-HNF4α (donor) and Cy5-L-FABP (acceptor) as well as FRET microscopy detected L-FABP in close proximity (~80 Å) to HNF4α, binding with high affinity Kd ~250–300 nM. Circular dichroism (CD) determined that the HNF4α/L-FABP interaction altered protein secondary structure. Finally, L-FABP potentiated transactivation of HNF4α in COS7 cells. Taken together, these data suggest that L-FABP provides a signaling path to HNF4α activation in the nucleus.
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