Location of a region of the muscarinic acetylcholine receptor involved in selective effector coupling

T. Kubo,H. Bujo,I. Akiba,J. Nakai,M. Mishina,S. Numa

Published 1988 in FEBS Letters

ABSTRACT

Chimaeric muscarinic acetylcholine receptors (mAChR) in which corresponding portions of mAChR I and mAChR II are replaced with each other have been produced in Xenopus oocytes by expression of cDNA constructs encoding them. Functional analysis of the chimaeric mAChRs indicates that a region mostly comprising the putative cytoplasmic portion between the proposed transmembrane segments V and VI is involved in selective coupling of mAChR I and mAChR II with different effector systems. In contrast, the exchange of this region between mAChR I and mAChR II does not significantly affect the antagonist binding properties of the two mAChR subtypes.

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