IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells.

IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Research Abstract Details 

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IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Abstract Text:

M Okada,K Shimura,H Shiraki,H Nakagawa,

The preceding paper showed that IMP dehydrogenase [IMP:NAD+ oxidoreductase, EC 1.2.1.14] tended to form a precipitable complex(es) through ionic and hydrophobic interactions. On the basis of these observations, a method was developed for purification of IMP dehydrogenase from Yoshida sarcoma ascites cells. On SDS-polyacrylamide gel electrophoresis, the purified preparation (1.19 U/mg protein) appeared homogeneous and its minimum molecular weight was estimated to be 68K daltons. Amino acid analyses indicated a subunit molecular weight of 68,042. Molecular sieve chromatography in the presence of 10% (NH4)2SO4 showed that the molecular weight of the native enzyme was 127K daltons. These values indicate that the native enzyme is composed of two identical subunits. However, the purified enzyme gave 4 protein bands on polyacrylamide gel electrophoresis under non-denaturing conditions, and appeared as a single fraction in the vicinity of the void volume on Ultrogel AcA 34 column chromatography at low salt concentration, indicating that its molecular weight exceeded 200K daltons. These findings indicate that the enzyme tends to aggregate owing to its own physicochemical characteristics. The Km values for IMP and NAD were calculated to be 12 and 25 microM, respectively, and the Ki values for XMP, GMP, and AMP to be 109, 130, and 854 microM, respectively. The purified enzyme showed full activity in the presence of K+, and K+ could be partially replaced by Na+. PCMB inactivated the enzyme, but the activity was completely restored by the addition of DTT. Cl-IMP also inactivated the enzyme and IMP prevented this inactivation.(ABSTRACT TRUNCATED AT 250 WORDS)

IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Publishing Authors By Initials

M Okada,K Shimura,H Shiraki,H Nakagawa,

For similar sulfhydryl compounds research abstracts see: sulfhydryl compounds research

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IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biochemistry

VOLUME: 94

Page Numbers: 1605-13

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Nov

YEAR: 1983

IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Information

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LANGUAGE: eng

NlmUniqueID: 376600

IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Keywords Mesh Terms:

KEYWORDS: Sulfhydryl Compounds

MESH TERMS: metabolism

Chemical & Substance for Abstract: IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells. Information

Substance Name: Ketone Oxidoreductases

Registry Number: EC 1.2.-

Grant and Affiliation Information for IMP dehydrogenase. II. Purification and properties of the enzyme from Yoshida sarcoma ascites tumor cells.

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Country: JAPAN

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MEDLINETA: J Biochem

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