Tetrapeptide inhibitors of the glutamate vesicular transporter (VGLUT).
Quinoline-2,4-dicarboxylic acids (QDCs) bearing lipophilic substituents in the 6- or 7-position were shown to be inhibitors of the glutamate vesicular transporter (VGLUT). Using the arrangement of the QDC lipophilic substituents as a template, libraries of X(1)X(2)EF and X(1)X(2)EW tetrapeptides were synthesized and tested as VGLUT inhibitors. The peptides QIEW and WNEF were found to be the most potent. Further stereochemical deconvolution of these two peptides showed dQlIdElW to be the best inhibitor (K(i)=828+/-252 microM). Modeling and overlay of the tetrapeptide inhibitors with the existing pharmacophore showed that H-bonding and lipophilic residues are important for VGLUT binding.
Center for Structural and Functional Neuroscience, Department of Biomedical and Pharmaceutical Sciences, The University of Montana, Missoula, MT 59812, USA.
Sarjubhai A
SA
Patel
Jon O
JO
Nagy
Erin D
ED
Bolstad
John M
JM
Gerdes
Charles M
CM
Thompson
D008958:Models, Molecular; D009842:Oligopeptides / Q000494:pharmacology*; D050495:Vesicular Inhibitory Amino Acid Transport Proteins / Q000037:antagonists & inhibitors*
D009842:Oligopeptides; C492245:SLC32A1 protein, human; D050495:Vesicular Inhibitory Amino Acid Transport Proteins