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Mol. Cell. Biol., Apr 1995, 2166-2172, Vol 15, No. 4
Copyright © 1995, American Society for Microbiology

Domain organization of I kappa B alpha and sites of interaction with NF- kappa B p65

E Jaffray, KM Wood and RT Hay
School of Biological and Medical Sciences, University of St. Andrews, Fife, Scotland.

The DNA-binding activity and cellular distribution of the transcription factor NF-kappa B are regulated by the inhibitor protein I kappa B alpha. I kappa B alpha belongs to a family of proteins that contain multiple repeats of a 30- to 35-amino-acid sequence that was initially recognized in the erythrocyte protein ankyrin. Partial proteolysis has been used to study the domain structure of I kappa B alpha and to determine the sites at which it interacts with NF-kappa B. The data reveal a tripartite structure for I kappa B alpha in which a central, protease-resistant domain composed of five ankyrin repeats is flanked by an unstructured N-terminal extension and a compact, highly acidic C- terminal domain that is connected to the core of the protein by a flexible linker. Functional analysis of V8 cleavage products indicates that I kappa B alpha molecules lacking the N-terminal region can interact with and inhibit the DNA-binding activity of the p65 subunit of NF-kappa B, whereas I kappa B alpha molecules which lack both the N- and C-terminal regions are incapable of doing so. Protease cleavage of the N terminus of I kappa B alpha was unaffected by the presence of the p65 subunit of NF-kappa B, whereas bound p65 blocked cleavage of the flexible linker connecting the C-terminal domain to the ankyrin repeat- containing core of the protein.(ABSTRACT TRUNCATED AT 250 WORDS)


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