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.
复制标题
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:
影响因子:
--
通讯作者:
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
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.
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影响因子:
4.8
作者:
SKIBA, NP;ARTEMYEV, NO;HAMM, HE
通讯作者:
HAMM, HE
DOI:
--
发表时间:
1991
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Stryer,L
通讯作者:
Stryer,L
DOI:
10.1111/j.1432-1033.1994.tb18700.x
发表时间:
1994
期刊:
European journal of biochemistry
影响因子:
--
作者:
M. Kutuzov;C. Pfister
通讯作者:
C. Pfister
影响因子:
2.7
作者:
HASHIDA, S;KOMINAMI, E;KATUNUMA, N
通讯作者:
KATUNUMA, N
DOI:
--
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Kroll,S;Phillips,WJ;Cerione,RA
通讯作者:
Cerione,RA