Molecular Biology and Evolution 18:1417-1420 (2001)
© 2001 Society for Molecular Biology and Evolution
The Putative Glutamate Receptors from Plants Are Related to Two Superfamilies of Animal Neurotransmitter Receptors via Distinct Evolutionary Mechanisms
Department of Biological Sciences, George Washington University
Soybean and Alfalfa Research Laboratory, United States Department of Agriculture, Agricultural Research Service, Beltsville, Maryland
Animal ionotropic glutamate receptors (iGLRs) and members of subfamily C (Kolakowski 1994
) or IV (Parmentier et al. 1998
) of the G-protein-coupled receptors (subC-GPCRs), which contains the metabotropic glutamate receptors (mGLRs) and
-aminobutyric acidB receptors (GABA-BRs), have distinct pharmacological and structural characteristics (Sutcliffe, Wo, and Oswald 1996
; Walker, Brooks, and Holden-Dye 1996
; Sutcliffe et al. 1998
). Likeness among members of the two superfamilies has been noted in the literature. The iGLRs share sequence similarity with regions of the mGLRs (Walker, Brooks, and Holden-Dye 1996
), and mGLRs share sequence similarity with GABA-BRs (Kaupmann et al. 1997
). In addition, all of the receptors, iGLRs (Wo and Oswald 1995
), mGLRs (O'Hara et al. 1993
), and GABA-BRs (Galvez et al. 1999
), have sequence similarities to portions of the bacterial periplasmic binding proteins. An evolutionary link between the iGLRs and the periplasmic binding proteins has been
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