Discusses the structure of GH5, the globular domain of the linker histone H5, and its implications for nucleosome binding. Structure determination; Description of the structure; Comparison with NMR structure; Comparison of the structures of GH5 and the DNA-binding domain of the catabolite gene activator protein CAP; DNA binding; Nucleosome binding; Model of GH5 binding to DNA; Secondary structure assignments for the residues of GH5; More.