Title : Biophysical evidence for His57 as a proton-binding site in the mammalian intestinal transporter hPepT1.

Pub. Date : 2003 Dec

PMID : 14725353






4 Functional Relationships(s)
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1 RESULTS: At pH 6.0, H57K-, H57R-, H121K-, and H121R-hPepT1 led to a 97%, 90%, 45%, and 75% decrease in [3H]Gly-Sar uptake into HEK293 cells, respectively. Glycine solute carrier family 15 member 1 Homo sapiens
2 In oocytes expressing H57R-hPepT1, steady-state currents induced by 5 mM Gly-Sar increased with increasing pH (I(max) = 300 nA at pH 8.5), suggesting the binding of protons to H57R. Glycine solute carrier family 15 member 1 Homo sapiens
3 CONCLUSIONS: H57R-hPepT1 is able to bind protons at a relatively basic pH, resulting in facilitation of transport of Gly-Sar by hPepT1 at higher pH. Glycine solute carrier family 15 member 1 Homo sapiens
4 CONCLUSIONS: H57R-hPepT1 is able to bind protons at a relatively basic pH, resulting in facilitation of transport of Gly-Sar by hPepT1 at higher pH. Glycine solute carrier family 15 member 1 Homo sapiens