Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change.

Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Research Abstract Details 

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Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Abstract Text:

Y Okamoto,T Sekine,

Conformational changes of the region involving 17K dalton light chain (G2) in gizzard myosin induced by ATP and its analogs were studied by a combination of light chain exchange and fluorescence spectroscopy. The cysteinyl residues of myosin light chain mixture, 20K dalton G1 and 17K dalton G2 chain, were labeled with a fluorescent thiol reagent, N-(1-anilionon-aphthyl-4ymaleimide (ANM). Chicken gizzard myosin was incubated with a large excess of the fluorescence labeled exogenous light chains in 2 M urea. After removal of urea and unbound light chains, a strong fluorescent band was observed at the position of the 17K dalton light chain (G2) of myosin on SDS PAGE. There was no difference in enzymatic activity and light chain composition between myosins before and after light chain exchange. The emission spectrum of ANM label in 17K dalton light chain in the bound state in myosin showed a fluorescence enhancement and a blue shift on adding ATP but not ADP. The spectral change disappeared after conversion of ATP to ADP. Various nucleoside triphosphates other than ATP had similar effects on the fluorescence spectrum. The relative effectiveness of most nucleotides on the fluorescence spectral change of ANM in the light chain bound in myosin agreed well with that on tryptophan residues in myosin, except in the case of ADP and CTP. These results suggest that 17K dalton light chain of gizzard myosin is closely related to the ATPase site of myosin.

Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Publishing Authors By Initials

Y Okamoto,T Sekine,

For similar organic chemicals: urea research abstracts see: organic chemicals: urea research

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Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biochemistry

VOLUME: 87

Page Numbers: 167-78

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Jan

YEAR: 1980

Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Information

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LANGUAGE: eng

NlmUniqueID: 376600

Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Keywords Mesh Terms:

KEYWORDS: Urea

MESH TERMS: analysis

Chemical & Substance for Abstract: Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change. Information

Substance Name: Myosins

Registry Number: EC 3.6.1.4

Grant and Affiliation Information for Involvement of 17K dalton light chain of smooth muscle myosin in substrate-induced conformational change.

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Country: JAPAN

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MEDLINETA: J Biochem

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