Picky ABCG5/G8 and promiscuous ABCG2 - a tale of fatty diets and drug toxicity.
Picky ABCG5/G8 and promiscuous ABCG2 - a tale of fatty diets and drug toxicity.
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DOI:
10.1002/1873-3468.13938
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发表时间:
2020-12
期刊:
影响因子:
3.5
通讯作者:
Lee JY
中科院分区:
文献类型:
--
作者:
Khunweeraphong N;Mitchell-White J;Szöllősi D;Hussein T;Kuchler K;Kerr ID;Stockner T;Lee JY
Structural data on ABCG5/G8 and ABCG2 reveal a unique molecular architecture for subfamily G ATP‐binding cassette (ABCG) transporters and disclose putative substrate‐binding sites. ABCG5/G8 and ABCG2 appear to use several unique structural motifs to execute transport, including the triple helical bundles, the membrane‐embedded polar relay, the re‐entry helices, and a hydrophobic valve. Interestingly, ABCG2 shows extreme substrate promiscuity, whereas ABCG5/G8 transports only sterol molecules. ABCG2 structures suggest a large internal cavity, serving as a binding region for substrates and inhibitors, while mutational and pharmacological analyses support the notion of multiple binding sites. By contrast, ABCG5/G8 shows a collapsed cavity of insufficient size to hold substrates. Indeed, mutational analyses indicate a sterol‐binding site at the hydrophobic interface between the transporter and the lipid bilayer. In this review, we highlight key differences and similarities between ABCG2 and ABCG5/G8 structures. We further discuss the relevance of distinct and shared structural features in the context of their physiological functions. Finally, we elaborate on how ABCG2 and ABCG5/G8 could pave the way for studies on other ABCG transporters.
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影响因子:
30.8
作者:
Buch, Stephan;Schafmayer, Clemens;Hampe, Jochen
通讯作者:
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影响因子:
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Izquierdo, MA
DOI:
10.1042/bcj20170923
发表时间:
2018-05-04
期刊:
The Biochemical journal
影响因子:
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作者:
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通讯作者:
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作者:
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通讯作者:
Locher, Kaspar P.