Structure of the STRA6 receptor for retinol uptake.

Structure of the STRA6 receptor for retinol uptake.
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DOI:
10.1126/science.aad8266
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发表时间:
2016-08-26
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Mancia F
Mancia F
中科院分区:
其他
文献类型:
--
作者:
Chen Y;Clarke OB;Kim J;Stowe S;Kim YK;Assur Z;Cavalier M;Godoy-Ruiz R;von Alpen DC;Manzini C;Blaner WS;Frank J;Quadro L;Weber DJ;Shapiro L;Hendrickson WA;Mancia F

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Vitamin A homeostasis is critical to normal cellular function. Retinol-binding protein (RBP) is the sole specific carrier in the bloodstream for hydrophobic retinol, the main form in which vitamin A is transported. The integral membrane receptor STRA6 mediates cellular uptake of vitamin A by recognizing RBP-retinol to trigger release and internalization of retinol. We present the structure of zebrafish STRA6 determined to 3.9-angstrom resolution by single-particle cryo-electron microscopy. STRA6 has one intramembrane and nine transmembrane helices in an intricate dimeric assembly. Unexpectedly, calmodulin is bound tightly to STRA6 in a noncanonical arrangement. Residues involved with RBP binding map to an archlike structure that covers a deep lipophilic cleft. This cleft is open to the membrane, suggesting a possible mode for internalization of retinol through direct diffusion into the lipid bilayer.
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