Abstract:
:The metabotropic glutamate receptors (mGluRs) are key receptors in the modulation of excitatory synaptic transmission in the central nervous system. Here we have determined three different crystal structures of the extracellular ligand-binding region of mGluR1--in a complex with glutamate and in two unliganded forms. They all showed disulphide-linked homodimers, whose 'active' and 'resting' conformations are modulated through the dimeric interface by a packed alpha-helical structure. The bi-lobed protomer architectures flexibly change their domain arrangements to form an 'open' or 'closed' conformation. The structures imply that glutamate binding stabilizes both the 'active' dimer and the 'closed' protomer in dynamic equilibrium. Movements of the four domains in the dimer are likely to affect the separation of the transmembrane and intracellular regions, and thereby activate the receptor. This scheme in the initial receptor activation could be applied generally to G-protein-coupled neurotransmitter receptors that possess extracellular ligand-binding sites.
journal_name
Naturejournal_title
Natureauthors
Kunishima N,Shimada Y,Tsuji Y,Sato T,Yamamoto M,Kumasaka T,Nakanishi S,Jingami H,Morikawa Kdoi
10.1038/35039564keywords:
subject
Has Abstractpub_date
2000-10-26 00:00:00pages
971-7issue
6807eissn
0028-0836issn
1476-4687journal_volume
407pub_type
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