One Functional Subunit is Sufficient for Catalytic Activity and Substrate Specificity of Escherichia Coli Endoribonuclease III Artificial Heterodimers

Overview

Journal FEBS Lett

Specialty Biochemistry

Date 2002 May 9

PMID 11997024

Citations 11

Authors

Christian Conrad

Jens Guido Schmitt

Elena Evguenieva-Hackenberg

Gabriele Klug

Affiliations

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Abstract

To study the intersubunit communication required for the activity of the normally homodimeric enzyme endoribonuclease III of Escherichia coli we have constructed and analysed an artificial heterodimer. This heterodimer is composed of one wild-type and one catalytically inactive subunit. The inactive subunit has one amino acid exchanged (E117K, rnc70 mutant) which abolishes cleavage activity but still allows substrate binding of a rnc70-homodimer. Our results show that one functional active site is sufficient for cleavage activity of the heterodimer.

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