In vivo studies of the gamma subunit of retinal cGMP-phophodiesterase with a substitution of tyrosine-84.

In vivo studies of the gamma subunit of retinal cGMP-phophodiesterase with a substitution of tyrosine-84.
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酪氨酸 84 取代的视网膜 cGMP-磷酸二酯酶 γ 亚基的体内研究。

DOI:
10.1042/0264-6021:3530467
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发表时间:
2001
期刊:
The Biochemical journal
影响因子:
--
通讯作者:
Goff,SP
Goff,SP
中科院分区:
--
文献类型:
--
作者:
Tsang,SH;Yamashita,CK;Doi,K;Salchow,DJ;Bouvier,N;Mendelsohn,M;Gouras,P;Farber,DB;Goff,SP

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抑制性杆 cGMP 磷酸二酯酶 γ 亚基 (PDEγ) 是光反应的主要组成部分,是支持杆完整性所必需的。Pdegtm1/Pdegtm1 小鼠(由于 Pdeg 基因的靶向破坏而缺乏 PDEγ)遭受非常快速和严重的光感受器变性。 PDEγ 的 Y84G (Tyr84→ Gly) 等位基因先前已在体外实验中显示,可减少野生型 γ 亚基对 PDE 催化核心 (PDEαβ) 的调节控制。为了确定该突变对体内功能的影响,使用鼠视蛋白启动子将突变型 Y84G 和野生型 PDEγ 对照转基因的表达引导至 +/Pdegtm1 小鼠的光感受器。将转基因小鼠与Pdegtm1/Pdegtm1小鼠杂交,产生仅能够合成转基因PDEγ的动物。我们的结果表明,野生型 PDEγ 和 Y84G 转基因可以补充 Pdegtm1/Pdegtm1 突变体以促进光感受器存活。该突变导致转导蛋白激活 PDE 时出现显着的生化缺陷。然而,Y84G突变并没有完全消除体内PDEγ对PDE催化核心的控制;突变亚基的表达仅与角膜视网膜电图的a波振幅减少10倍和b波振幅减少1.5倍相关。出乎意料的是,这种突变在体内引起的表型比体外生化分析预测的要“温和”得多。
The inhibitory rod cGMP phosphodiesterase γ subunit (PDEγ) is a major component of the photoresponse and is required to support rod integrity.Pdegtm1/Pdegtm1mice (which lack PDEγ owing to a targeted disruption of thePdeggene) suffer from a very rapid and severe photoreceptor degeneration. The Y84G (Tyr84→ Gly) allele of PDEγ has previously been shown in experiments carried outin vitroto reduce the regulatory control of the PDE catalytic core (PDEαβ) exerted by the wild-type γ subunit. To determine the effects of this mutation onin vivofunction, the murine opsin promoter was used to direct expression to the photoreceptors of+/Pdegtm1mice of a mutant Y84G and a wild-type PDEγ control transgene. The transgenic mice were crossed withPdegtm1/Pdegtm1mice to generate animals able to synthesize only the transgenic PDEγ. Our results showed that wild-type PDEγ and Y84G transgenes could complement thePdegtm1/Pdegtm1mutant for photoreceptor survival. The mutation caused a significant biochemical defect in PDE activation by transducin. However, the Y84G mutation did not fully eliminate the control of PDEγ on the PDE catalytic corein vivo; the expression of the mutant subunit was associated with only a 10-fold reduction in the amplitude of the a-wave and a 1.5-fold decrease in the b-wave of the corneal electroretinogram. Unexpectedly, the mutation caused a much ‘milder’ phenotypein vivothan was predicted from the biochemical assaysin vitro.
DOI: 10.1074/jbc.270.22.13210
发表时间: 1995-06-02
影响因子: 4.8
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DOI: --
发表时间: 1991
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影响因子: --
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发表时间: 1982-01-01
影响因子: 2.7
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DOI: --
发表时间: 1989
期刊: The Journal of biological chemistry
影响因子: --
作者:
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通讯作者: Cerione,RA