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(Received for publication, August 24, 1994) The Bacillus subtilis bacteriophage PBS2 uracil-DNA
glycosylase inhibitor (Ugi) is an acidic protein of 84 amino acids that
inactivates uracil-DNA glycosylase from diverse organisms (Wang, Z.,
and Mosbaugh, D. W.(1989) J. Biol. Chem. 264,
1163-1171). The secondary structure of Ugi has been determined by
solution state multidimensional nuclear magnetic resonance. The protein
adopts a single well defined structure consisting of five anti-parallel
Volume 270,
Number 1,
Issue of January 6, 1995 pp. 296-303
©1995 by The American Society for Biochemistry and Molecular Biology, Inc.
-strands and two
-helices. Six loop or turn regions were
identified that contain approximately one half of the acidic amino acid
residues and connect the
-strands sequentially to one another. The
secondary structure suggests which regions of Ugi may be involved in
interactions with uracil-DNA glycosylase.
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