Cryo-EM structure of PepT2 reveals structural basis for proton-coupled peptide and prodrug transport in mammals.

Cryo-EM structure of PepT2 reveals structural basis for proton-coupled peptide and prodrug transport in mammals.
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DOI:
10.1126/sciadv.abh3355
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发表时间:
2021-08
期刊:
影响因子:
13.6
通讯作者:
Newstead S
Newstead S
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Parker JL;Deme JC;Wu Z;Kuteyi G;Huo J;Owens RJ;Biggin PC;Lea SM;Newstead S

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Structure of PepT2 reveals binding model for peptide recognition and enables a more rationalized approach to prodrug design. The SLC15 family of proton-coupled solute carriers PepT1 and PepT2 play a central role in human physiology as the principal route for acquiring and retaining dietary nitrogen. A remarkable feature of the SLC15 family is their extreme substrate promiscuity, which has enabled the targeting of these transporters for the improvement of oral bioavailability for several prodrug molecules. Although recent structural and biochemical studies on bacterial homologs have identified conserved sites of proton and peptide binding, the mechanism of peptide capture and ligand promiscuity remains unclear for mammalian family members. Here, we present the cryo–electron microscopy structure of the outward open conformation of the rat peptide transporter PepT2 in complex with an inhibitory nanobody. Our structure, combined with molecular dynamics simulations and biochemical and cell-based assays, establishes a framework for understanding peptide and prodrug recognition within this pharmaceutically important transporter family.
从绝对结合自由能计算中的配体选择性预测。
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