SF1 and SF2 helicases: family matters.
Helicases of the superfamily (SF) 1 and 2 are involved in virtually all aspects of RNA and DNA metabolism. SF1 and SF2 helicases share a catalytic core with high structural similarity, but different enzymes even within each SF perform a wide spectrum of distinct functions on diverse substrates. To rationalize similarities and differences between these helicases, we outline a classification based on protein families that are characterized by typical sequence, structural, and mechanistic features. This classification complements and extends existing SF1 and SF2 helicase categorizations and highlights major structural and functional themes for these proteins. We discuss recent data in the context of this unifying view of SF1 and SF2 helicases.
Fairman-Williams
Margaret E
ME
Center for RNA Molecular Biology & Department of Biochemistry, School of Medicine, Case Western Reserve University, Cleveland, OH 44106, USA.
Guenther
Ulf-Peter
UP
Jankowsky
Eckhard
E
D000595:Amino Acid Sequence; D000818:Animals; D004265:DNA Helicases / Q000737:chemistry / Q000145:classification / Q000378:metabolism; D006801:Humans; D008969:Molecular Sequence Data; D017434:Protein Structure, Tertiary; D020365:RNA Helicases / Q000737:chemistry / Q000145:classification / Q000378:metabolism
D004265:DNA Helicases; D020365:RNA Helicases
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