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Helix-turn-helix
In
proteins
, the
helix-turn-helix
(
HTH
) is a major
structural motif
capable of binding
DNA
. It is composed of two
a helices
joined by a short strand of
amino acids
and is found in many proteins that regulate
gene expression
. It should not be confused with the
helix-loop-helix
domain.
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