Nucleic Acids Res. 1991 Apr 25;19(8):1739-40.

Homology between IRE-BP, a regulatory RNA-binding protein, aconitase, and isopropylmalate isomerase.

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European Molecular Biology Laboratory, Heidelberg, FRG.

Abstract

Iron-responsive elements (IREs) are regulatory RNA elements which serve as specific binding sites for the IRE-binding protein (IRE-BP). Interaction between IREs and IRE-BP induces repression of ferritin mRNA translation and transferrin receptor mRNA stabilization. We describe the identification of extensive amino acid sequence homology between IRE-BP and two known isomerases, aconitase and isopropylmalate (IPM) isomerase. We discuss the implications of this observation with regard to structure/function relationships of IRE-BP. The structural conservation between a regulatory RNA-binding protein and two enzymes involved in intermediary metabolism provides a surprising example of the functional flexibility in biological structures.

PMID:: 1903202; [PubMed - indexed for MEDLINE]
PMCID:: PMC328097

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Homology between IRE-BP, a regulatory RNA-binding protein, aconitase, and isopropylmalate isomerase.

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