Helicase motifs: the engine that powers DNA unwinding

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Helicases are vital enzymes involved in DNA metabolism and human genetic disorders.
• Conserved 'helicase motifs' are critical for helicase function and shared by chromatin remodeling enzymes.

Purpose of the Study:

• To review helicase structure-function studies in light of recent crystal structure reports.
• To elucidate the functional significance of conserved helicase motifs.

Main Methods:

• Structure-function studies targeting conserved residues within helicase motifs.
• Analysis of three-dimensional crystal structures of three different helicases.

Main Results:

• Conserved helicase motifs cluster to form nucleotide and nucleic acid binding sites.
• These motifs are integral to nucleotide hydrolysis and energy transduction for DNA unwinding.
• The helicase engine powers chromatin remodeling by altering protein-DNA structure.

Conclusions:

• Helicase conserved motifs form an engine driving nucleic acid unwinding via nucleotide hydrolysis and conformational changes.
• This engine is also involved in chromatin remodeling, providing energy for protein-DNA structure alteration.