Research Project
Grant-in-Aid for Scientific Research (C)
To clarify the molecular mechanism of the electrogenic transporter accompanying ion movement, we precisely determined the transport of halorhodopsin, a light-driven Cl- pump (pHR) and human oligopeptide transporter (hPEPT1).(1) The crystal structure (PDB:3QBG) of pHR clearly shows that the amino acid residue, Ser 130 is located in the vicinity of the protonated Schiff base and forms the hydrogen bond to the Schiff vase. Based on the Cl- transport activities of mutant Ser130, it has turned out that Ser130 coordinates with PBS and functions as a molecular valve to hinder the internal leak, backflux of Cl- during anion-transport cycle.(2) We demonstrated that mutation of Ser302 located in the vicinity of His57 in PEPT1 caused the alkaline shift of the optimum pH in the transport activity. This shift demonstrates that the hydroxyl group of Ser302 forms the hydrogen-bonding with the imidazole of His57, which might keep the uptake activity optimum in the range of physiological intestinal pH.
All 2014 2013 2012 2011 Other
All Journal Article (14 results) (of which Peer Reviewed: 14 results) Presentation (20 results) (of which Invited: 4 results) Book (3 results)
Biophys Chem
Volume: 172 Pages: 61-67
J Biophys Chem
Volume: 4 Pages: 11-21
F EBS Lett
Volume: 587 Pages: 322-327
120005228320
Journal of Biophysical Chemistry
Volume: 4 Issue: 01 Pages: 11-21
10.4236/jbpc.2013.41002
Biophysical Chemistry
10.1016/j.bpc.2013.01.001
Biochemistry
Volume: 51 Pages: 9290-9301
Volume: 51 Pages: 8802-8813
Biophys J
Volume: 102 Pages: 2906-2915
Biochim Biophys Acta
Volume: 1808 Pages: 2905-2912
120003762628
J Mol Biol
Volume: 411 Pages: 986-998
Volume: 50 Pages: 8888-8898
Volume: 50 Pages: 2135-2143
Volume: 50 Issue: 41 Pages: 8888-8898
10.1021/bi2009932
Biochimica et Biophysica Acta-Biomembranes
Volume: 1808 Issue: 12 Pages: 2905-2912
10.1016/j.bbamem.2011.08.035