ジャーナル: FEBS Lett / 年: 2024 タイトル: The ATP-bound inward-open conformation of ABCC4 reveals asymmetric ATP binding for substrate transport. 著者: Yue Zhu / Xiaoke Xing / Fuxing Wang / Luojun Chen / Chunhui Zhong / Xiting Lu / Zhanwang Yu / Yongbo Yang / Yi Yao / Qibin Song / Suxia Han / Zheng Liu / Pingfeng Zhang / 要旨: The multidrug resistance-associated protein (MRP) ABCC4 facilitates substrate transport across the cytoplasmic membrane, crucial for normal physiology and mediating multidrug resistance in tumor ...The multidrug resistance-associated protein (MRP) ABCC4 facilitates substrate transport across the cytoplasmic membrane, crucial for normal physiology and mediating multidrug resistance in tumor cells. Despite intensive studies on MRPs, ABCC4's transport mechanism remains incompletely understood. In this study, we unveiled an inward-open conformation with an ATP bound to degenerate NBD1. Additionally, we captured the structure with both ATP and substrate co-bound in the inward-open state. Our findings uncover the asymmetric ATP binding in ABCC4 and provide insights into substrate binding and transport mechanisms. ATP binding to NBD1 is parallel to substrate binding to ABCC4, and is a prerequisite for ATP-bound NBD2-induced global conformational changes. Our findings shed new light on targeting ABCC4 in combination with anticancer therapy.
凍結剤: ETHANE / チャンバー内湿度: 100 % / チャンバー内温度: 277 K / 装置: FEI VITROBOT MARK IV 詳細: After incubation on the grids at 277K under 100% humidity for 10 s, the grids were bloted for 3.0 s and then plunged frozen into liquid ethane cooled by liquid nitrogen using a Vitrobot..
詳細
The human ABCC4 protein was purified in 0.005% (w/v) GDN and 0.0005% CHS, the peak protein fraction from gel filtration column were concentrated to about 10 mg/ml.
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電子顕微鏡法
顕微鏡
FEI TITAN KRIOS
撮影
フィルム・検出器のモデル: GATAN K3 BIOQUANTUM (6k x 4k) 平均電子線量: 55.0 e/Å2