Novel GLRA1 missense mutation (P250T) in dominant hyperekplexia defines an intracellular determinant of glycine receptor channel gating.

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Version: author
Serval ID
serval:BIB_7512A3B970DC
Type
Article: article from journal or magazin.
Collection
Publications
Title
Novel GLRA1 missense mutation (P250T) in dominant hyperekplexia defines an intracellular determinant of glycine receptor channel gating.
Journal
Journal of Neuroscience
Author(s)
Saul B., Kuner T., Sobetzko D., Brune W., Hanefeld F., Meinck H.M., Becker C.M.
ISSN
0270-6474 (Print)
ISSN-L
0270-6474
Publication state
Published
Issued date
1999
Peer-reviewed
Oui
Volume
19
Number
3
Pages
869-877
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov'tPublication Status: ppublish
Abstract
Missense mutations as well as a null allele of the human glycine receptor alpha1 subunit gene GLRA1 result in the neurological disorder hyperekplexia [startle disease, stiff baby syndrome, Mendelian Inheritance in Man (MIM) #149400]. In a pedigree showing dominant transmission of hyperekplexia, we identified a novel point mutation C1128A of GLRA1. This mutation encodes an amino acid substitution (P250T) in the cytoplasmic loop linking transmembrane regions M1 and M2 of the mature alpha1 polypeptide. After recombinant expression, homomeric alpha1(P250T) subunit channels showed a strong reduction of maximum whole-cell chloride currents and an altered desensitization, consistent with a prolonged recovery from desensitization. Apparent glycine binding was less affected, yielding an approximately fivefold increase in Ki values. Topological analysis predicts that the substitution of proline 250 leads to the loss of an angular polypeptide structure, thereby destabilizing open channel conformations. Thus, the novel GLRA1 mutant allele P250T defines an intracellular determinant of glycine receptor channel gating.
Keywords
Amino Acid Sequence/genetics, Amino Acid Substitution/genetics, Genes, Dominant/genetics, Humans, Intracellular Membranes/metabolism, Ion Channel Gating/physiology, Ion Channels/metabolism, Molecular Sequence Data, Muscle Rigidity/genetics, Mutation, Missense/genetics, Pedigree, Receptors, Glycine/genetics, Receptors, Glycine/metabolism, Reflex, Abnormal/genetics, Startle Reaction/physiology
Pubmed
Create date
29/03/2010 13:14
Last modification date
20/08/2019 15:32
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