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・ Helix nucula
・ Helix obruta
・ Helix of sustainability
・ Helix Pass
・ Helix piercing
・ Helix pomatia
・ Helix Producer 1
・ Helix School
・ Helix SF
・ Helix Software Company
・ Helix texta
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・ Helix, Oregon
Helix-turn-helix
・ Helixanthera
・ Helixanthera schizocalyx
・ Helixe
・ Helixocerus
・ Helix–coil transition model
・ Helizabad
・ Helizabad, Dehgolan
・ Heliópolis
・ Heliópolis, Bahia
・ Heljan
・ Helka Hynninen
・ Helkama
・ Helke Sander
・ Helkiah Crooke


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Helix-turn-helix : ウィキペディア英語版
Helix-turn-helix

In proteins, the helix-turn-helix (HTH) is a major structural motif capable of binding DNA. It is composed of two α 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.
==Discovery==

The discovery of the helix-turn-helix motif was based on similarities between several genes encoding transcription regulatory proteins from bacteriophage lambda and ''Escherichia coli'': Cro, CAP, and λ repressor, which were found to share a common 20-25 amino acid sequence that facilitates DNA recognition.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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