A K52Q substitution in the globular domain of histone H1t modulates its nucleosome binding properties

Ramesh, Sneha ; Srinivas Bharath, M. M. ; Chandra, Nagasuma R. ; Rao, Manchanahalli R. Satyanarayana (2006) A K52Q substitution in the globular domain of histone H1t modulates its nucleosome binding properties FEBS Letters, 580 (25). pp. 5999-6006. ISSN 0014-5793

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Official URL: http://www.febsletters.org/article/S0014-5793(06)0...

Related URL: http://dx.doi.org/10.1016/j.febslet.2006.09.061

Abstract

A comparison of the globular domain sequences of the somatic H1d and testis-specific H1t revealed a single substitution of lysine 52 in H1d to glutamine 54 in H1t, which is one of the three crucial residues within the second DNA binding site. The globular domains of both histones were modeled using the crystal structure of chicken GH5 as a template and was also docked onto the nucleosome structure. The glutamine residue in histone H1t forms a hydrogen bond with main chain carbonyl of methionine-52 (in H1t) and is spatially oriented away from the nucleosome dyad axis. A consequence of this change was a lower affinity of recombinant histone H1t towards Four-way junction DNA and reconstituted 5S mononucleosomes. When Gln-54 in Histone H1t was mutated to lysine, its binding affinity towards DNA substrates was comparable to that of histone H1d. The differential binding of histones H1d and H1t towards reconstituted mononucleosomes was also reflected in the chromatosome-stop assay.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Histone H1t; Globular Domain; Nucleosome Binding Property
ID Code:42505
Deposited On:04 Jun 2011 09:37
Last Modified:17 May 2016 23:46

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