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(Received for publication, October 22, 1996, and in revised form, February 19, 1997)
From Abteilung Biochemie, Institut für Molekulare
Biotechnologie, Postfach 100813, D-07708 Jena, Germany
Full-length human nuclear DNA helicase II (NDH
II) was cloned and overexpressed in a baculovirus-derived expression
system. Recombinant NDH II unwound both DNA and RNA. Limited tryptic
digestion produced active helicases with molecular masses of 130 and
100 kDa. The 130-kDa helicase missed a glycine-rich domain (RGG-box) at
the carboxyl terminus, while the 100-kDa form missed both its double-stranded RNA binding domains (dsRBDs) at the amino terminus and
its RGG-box. Hence, the dsRBDs and the RGG-box were dispensable for
unwinding. On the other hand, the isolated DEXH core alone could neither hydrolyze ATP nor unwind nucleic acids. These enzymatic activities were not regained by fusing a complete COOH or
NH2 terminus to the helicase core. Hence, an active
helicase required part of the NH2 terminus, the
DEXH core, and a C-terminal extension of the core. Both
dsRBDs and the RGG-box were bacterially expressed as glutathione
S-transferase fusion proteins. The two dsRBDs had a strong
affinity to double-stranded RNA and cooperated upon RNA binding, while
the RGG-box bound preferentially to single-stranded DNA. A model is
suggested in which the flanking domains influence and regulate the
unwinding properties of NDH II.
Volume 272, Number 17,
Issue of April 25, 1997
pp. 11487-11494
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
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