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Nucleic Acids Research, 2000, Vol. 28, No. 14 2643-2650
© 2000 Oxford University Press

Common fold in helix–hairpin–helix proteins

Xuguang Shao2 and Nick V. Grishin1,2,*

1Howard Hughes Medical Institute and 2Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9050, USA

Helix–hairpin–helix (HhH) is a widespread motif involved in non-sequence-specific DNA binding. The majority of HhH motifs function as DNA-binding modules, however, some of them are used to mediate protein–protein interactions or have acquired enzymatic activity by incorporating catalytic residues (DNA glycosylases). From sequence and structural analysis of HhH-containing proteins we conclude that most HhH motifs are integrated as a part of a five-helical domain, termed (HhH)2 domain here. It typically consists of two consecutive HhH motifs that are linked by a connector helix and displays pseudo-2-fold symmetry. (HhH)2 domains show clear structural integrity and a conserved hydrophobic core composed of seven residues, one residue from each {alpha}-helix and each hairpin, and deserves recognition as a distinct protein fold. In addition to known HhH in the structures of RuvA, RadA, MutY and DNA-polymerases, we have detected new HhH motifs in sterile alpha motif and barrier-to-autointegration factor domains, the {alpha}-subunit of Escherichia coli RNA-polymerase, DNA-helicase PcrA and DNA glyco­s­y­lases. Statistically significant sequence similarity of HhH motifs and pronounced structural conservation argue for homology between (HhH)2 domains in different protein families. Our analysis helps to clarify how non-symmetric protein motifs bind to the double helix of DNA through the formation of a pseudo-2-fold symmetric (HhH)2 functional unit.

* To whom correspondence should be addressed at: Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9050, USA. Tel: +1 214 648 3386; Fax: +1 214 648 9099; Email: grishin@chop.swmed.edu


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