unc-68 encodes a ryanodine receptor involved in regulating C. elegans body-wall muscle contraction.

unc-68 encodes a ryanodine receptor involved in regulating C. elegans body-wall muscle contraction.
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UNC-68编码参与调节秀丽隐杆线虫身体壁肌收缩的ryanodine受体。

DOI:
10.1083/jcb.134.4.885
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发表时间:
1996-08
影响因子:
7.8
通讯作者:
Anderson, P
Anderson, P
中科院分区:
生物学1区
文献类型:
--
作者:
Maryon, EB;Coronado, R;Anderson, P

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Striated muscle contraction is elicited by the release of stored calcium ions through ryanodine receptor channels in the sarcoplasmic reticulum. ryr-1 is a C. elegans ryanodine receptor homologue that is expressed in body-wall muscle cells used for locomotion. Using genetic methods, we show that ryr-1 is the previously identified locus unc-68. First, transposon-induced deletions within ryr-1 are alleles of unc-68. Second, transformation of unc-68 mutants with ryr-1 genomic DNA results in rescue of the Unc phenotype. unc-68 mutants move poorly, exhibiting an incomplete flaccid paralysis, yet have normal muscle ultrastructure. The mutants are insensitive to the paralytic effects of ryanodine, and lack detectable ryanodine-binding activity. The Unc-68 phenotype suggests that ryanodine receptors are not essential for excitation- contraction coupling in nematodes, but act to amplify a (calcium) signal that is sufficient for contraction.
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