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Cat muscle acetylcholine receptors (AcChoR) expressed in Xenopus oocytes desensitized more slowly than Torpedo electric organ AcChoRs, also expressed in oocytes. To examine the bases for the different degrees of desensitization, cat-Torpedo AcChoR hybrids were formed by injecting oocytes with cat denervated muscle mRNA mixed with a large excess of cloned Torpedo AcChoR subunit mRNAs. Hybrid AcChoRs formed by coinjection of cat muscle mRNA with the Torpedo beta or delta subunit mRNAs desensitized as slowly as cat AcChoR. In contrast, the hybrid AcChoRs expressed by coinjection with the Torpedo gamma subunit mRNA desensitized much more rapidly than cat AcChoR. The AcChoRs expressed in oocytes injected with cat muscle mRNA together with the Torpedo beta, gamma, and delta subunit mRNAs desensitized as rapidly as Torpedo AcChoR, indicating that the cat alpha subunit does not play an important role in determining the slow rate of desensitization. It is concluded that the difference in the rates of desensitization of cat and Torpedo AcChoRs is determined mainly by differences in their respective gamma subunits.
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