5a9i

Crystal structure of the extracellular domain of PepT2

spinqualitylabelsall models 5a9i, resolution 2.84Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5a9i is a 3 chain structure with sequence from Buffalo rat. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CIT, GOL NonStd Res: MSE Related: 5a9d, 5a9h Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [S15A2_RAT] Proton-coupled intake of oligopeptides of 2 to 4 amino acids with a preference for dipeptides. Publication Abstract from PubMed Mammals obtain nitrogen via the uptake of di- and tri-peptides in the gastrointestinal tract through the action of PepT1 and PepT2, which are members of the POT family of proton-coupled oligopeptide transporters. PepT1 and PepT2 also play an important role in drug transport in the human body. Recent crystal structures of bacterial homologs revealed a conserved peptide-binding site and mechanism of transport. However, a key structural difference exists between bacterial and mammalian homologs with only the latter containing a large extracellular domain, the function of which is currently unknown. Here, we present the crystal structure of the extracellular domain from both PepT1 and PepT2 that reveal two immunoglobulin-like folds connected in tandem, providing structural insight into mammalian peptide transport. Functional and biophysical studies demonstrate that these domains interact with the intestinal protease trypsin, suggesting a role in clustering proteolytic activity to the site of peptide transport in eukaryotic cells. Crystal Structures of the Extracellular Domain from PepT1 and PepT2 Provide Novel Insights into Mammalian Peptide Transport.,Beale JH, Parker JL, Samsudin F, Barrett AL, Senan A, Bird LE, Scott D, Owens RJ, Sansom MS, Tucker SJ, Meredith D, Fowler PW, Newstead S Structure. 2015 Aug 27. pii: S0969-2126(15)00322-6. doi:, 10.1016/j.str.2015.07.016. PMID:26320580 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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