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Prediction of an HMG-box fold in the C-terminal domain of histone H1: Insights into its role in DNA condensation

Bharath, Srinivas MM and Chandra, Nagasuma R and Rao, MRS (2002) Prediction of an HMG-box fold in the C-terminal domain of histone H1: Insights into its role in DNA condensation. In: Proteins: Structure, Function, and Genetics, 49 (1). pp. 71-81.

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Abstract

In eukaryotes, histone H1 promotes the organization of polynucleosome filaments into chromatin fibers, thus contributing to the formation of an important structural framework responsible for various DNA transaction processes. The H1 protein consists of a short N-terminal nose, a central globular domain, and a highly basic C-terminal domain. Structure prediction of the C-terminal domain using fold recognition methods reveals the presence of an HMG-box-like fold. We recently showed by extensive site-directed and deletion mutagenesis studies that a 34 amino acid segment encompassing the three S/TPKK motifs, within the C-terminal domain, is responsible for DNA condensing properties of H1. The position of these motifs in the predicted structure corresponds exactly to the DNA-binding segments of HMG-box-containing proteins such as Lef-1 and SRY. Previous analyses have suggested that histone H1 is likely to bend DNA bound to the C-terminal domain, directing the path of linker DNA in chromatin. Prediction of the structure of this domain provides a framework for understanding the higher order of chromatin organization.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Wiley-Liss, Inc., A Wiley Company
Keywords: HMG-box fold;histone H1;DNA condensation;C-terminal domain;chromatin organization
Department/Centre: Division of Information Sciences > BioInformatics Centre
Division of Biological Sciences > Biochemistry
Date Deposited: 12 Jul 2004
Last Modified: 19 Sep 2010 04:13
URI: http://eprints.iisc.ernet.in/id/eprint/1015

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