The existence of human renin-binding protein (RnBP) in the kidney has been shown by the isolation and characterization of a complex of porcine renin-human RnBP [S. Takahashi et al. (1985) J. Biochem. 97, 671-677]. However, the properties of the free form of human RnBP had not been understood, because of the limitation of materials. In the present study, we have expressed human RnBP in Escherichia coli JM 109 cells under the transcriptional control of taq promoter and purified it by conventional column chromatographies. The purified recombinant human RnBP (rhRnBP) exists as a dimer and inhibits porcine renin activity through formation of a complex of porcine renin with rhRnBP, the so-called high-molecular-weight renin. Moreover, the rhRnBP catalyzes the interconversion between N-acetyl-D-glucosamine (GlcNAc) and N-acetyl-D-Mannosamine (ManNAc) with the apparent Km values of 21.3 mM for GlcNAc and 12.8 mM for ManNAc, and 0.13 mM for effector ATP. ATP is essential for the GlcNAc 2-epimerase activity of human RnBP. These results indicate that the human RnBP is a GlcNAc 2-epimerase.
Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase. Publishing Authors By Initials
Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase. Journal Published:
PUBLICATION TYPE: Journal Article
Journal: Journal of biochemistry
VOLUME: 125
Page Numbers: 348-53
Journal Abbreviation: J. Biochem.
ISSN: 0021-924X
DAY: 19
MONTH: Feb
YEAR: 1999
Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase. Information
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LANGUAGE: eng
NlmUniqueID: 376600
Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase. Keywords Mesh Terms:
KEYWORDS: Swine
MESH TERMS: metabolism
Chemical & Substance for Abstract: Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase. Information
Substance Name: RENBP protein, human
Registry Number: EC 5.1.3.8
Grant and Affiliation Information for Human renin-binding protein is the enzyme N-acetyl-D-glucosamine 2-epimerase.
AFFILIATION: Department of Bioengineering, Akita Research Institute of Food and Brewing, Sanuki, Arayamachi, Akita, 010-1623, Japan. saori@arif.pref.akita.jp
Country: JAPAN
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MEDLINETA: J Biochem
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