A K52Q substitution in the globular domain of histone H1t modulates its nucleosome binding properties.
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.
Ramesh
Sneha
S
Department of Biochemistry, Indian Institute of Science, Bangalore, 560012, India.
Bharath
M M Srinivas
MM
Chandra
Nagasuma R
NR
Rao
Manchanahalli R Satyanarayana
MR
D000595:Amino Acid Sequence; D019943:Amino Acid Substitution; D000818:Animals; D001665:Binding Sites / Q000235:genetics; D006657:Histones / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D006860:Hydrogen Bonding; D066298:In Vitro Techniques; D007700:Kinetics; D008297:Male; D008958:Models, Molecular; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009707:Nucleosomes / Q000378:metabolism*; D011485:Protein Binding; D017434:Protein Structure, Tertiary; D051381:Rats; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013737:Testis / Q000378:metabolism
D006657:Histones; D009707:Nucleosomes; D011994:Recombinant Proteins