The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium.

The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Research Abstract Details 

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The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Abstract Text:

K Inouye,B Tonomura,K Hiromi,T Kotaka,H Inagaki,S Sato,S Murao,

The molecular weight of Streptomyces subtilisin inhibitor (SSI), a protein proteinase inhibitor, and that of the complex of SSI and subtilisin BPN' [EC 3.4.21.14] were determined by a sedimentation equilibrium method in 25 mM phosphate buffer, at pH 7.0, ionic strength 0.1 M (NaCl), 25.0 degrees C. The molecular weight of SSI was found to be 23,000 over a wide concentration range, 0.01-10 mg/ml, the range used for inhibitory, spectrophotometric, and kinetic measurements. Based on the amino acid sequence, the molecular weight of SSI has been calculated to be 11,500 (Ikenaka, T., et al. (1974) J. Biochem. 76, 1191-1209); therefore, the molecular weight of 23,000 obtained above suggests that SSI is in a dimeric form under usual conditions in the concentration range of 5 X 10(-7)-5 X 10(-4) M. The molecular weight of the subtilisin BPN'-SSI complex was determined to be 78,000 in the concentration range of 0.03-5.0 mg/ml by sedimentation equilibrium of the crystallized preparation and by that of a mixture of subtilisin BPN' and SSI treated as a multicomponent-polydisperse system. The molecular weight obtained here, combined with the results of binding stoichiometry (Inouye, K., et al. (1977) J. Biochem. 82, 961-967) that showed that one mol of SSI (molecular weight, 11,500) and one mol of the enzyme (molecular weight, 27,500) are tightly bound (Kd less than 1 nM), demonstrate that one mol of dimeric SSI binds two mol of the enzyme to form a stable complex, E2I2.

The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Publishing Authors By Initials

K Inouye,B Tonomura,K Hiromi,T Kotaka,H Inagaki,S Sato,S Murao,

For similar enzymes and coenzymes: enzymes: hydrolases: peptide hydrolases: endopeptidases: serine endopeptidases: subtilisins research abstracts see: enzymes and coenzymes: enzymes: hydrolases: peptide hydrolases: endopeptidases: serine endopeptidases: subtilisins research

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The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biochemistry

VOLUME: 84

Page Numbers: 843-53

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Oct

YEAR: 1978

The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Information

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LANGUAGE: eng

NlmUniqueID: 376600

The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Keywords Mesh Terms:

KEYWORDS: Subtilisins

MESH TERMS: antagonists & inhibitors

Chemical & Substance for Abstract: The determination of molecular weights of Streptomyces subtilisin inhibitor and the complex of Streptomyces subtilisin inhibitor and subtilisin BPN' by sedimentation equilibrium. Information

Substance Name: Subtilisins

Registry Number: EC 3.4.21.-

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Country: JAPAN

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MEDLINETA: J Biochem

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