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pubmed-article:10414965pubmed:abstractTextGABA(A) receptors are believed to be heteropentamers that can be constructed from six subunit classes: alpha(1-6), beta(1-4), gamma(1-3), delta, epsilon, and pi. Given that individual neurons often express multiple receptor subunits, it is important to understand how these receptors assemble. To determine which domains of receptor subunits control assembly, we have exploited the differing capabilities of the beta2 and beta3 subunits to form functional cell surface homomeric receptors. Using a chimeric approach, we have identified four amino acids in the N-terminal domain of the beta3 subunit that mediate functional cell surface expression of this subunit compared with beta2, which is retained within the endoplasmic reticulum. Substitution of these four amino acids-glycine 171, lysine 173, glutamate 179, and arginine 180-into the beta2 subunit was sufficient to enable the beta2 subunit to homo-oligomerize. The effect of this putative "assembly signal" on the production of heteromeric receptors composed of alphabeta and betagamma subunits was also analyzed. This signal was not critical for the formation of receptors composed of either alpha1beta2 or alpha1beta3 subunits, suggesting that mutation of these residues did not disrupt subunit folding. However, this signal was important in the formation of betagamma2 receptors. These residues did not seem to affect the initial association of beta2 and gamma2 subunits but appeared to be important for the subsequent production of functional receptors. Our studies identify, for the first time, key residues within the N-terminal domains of receptor beta subunits that mediate the selective assembly of GABA(A) receptors.lld:pubmed
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pubmed-article:10414965pubmed:dateRevised2009-9-29lld:pubmed
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pubmed-article:10414965pubmed:articleTitleIdentification of amino acid residues within GABA(A) receptor beta subunits that mediate both homomeric and heteromeric receptor expression.lld:pubmed
pubmed-article:10414965pubmed:affiliationThe Medical Research Council Laboratory for Molecular Cell Biology and Department of Pharmacology, University College London, London WC1E 6BT, United Kingdom.lld:pubmed
pubmed-article:10414965pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:10414965pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
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