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helix-turn-helix domain-containing protein
This large family of DNA binding helix-turn helix proteins includes Cro Swiss:P03036 and CI Swiss:P03034. Within the protein Swiss:Q5F9C2, the full protein fold incorporates a helix-turn-helix motif, but the function of this member is unlikely to be that of a DNA-binding regulator, the function of most other members, so is not necessarily characteristic of the whole family [1]. [1]. 20196080. The crystal structure of NGO0477 from Neisseria gonorrhoeae reveals a novel protein fold incorporating a helix-turn-helix motif. Ren J, Sainsbury S, Nettleship JE, Saunders NJ, Owens RJ;. Proteins. 2010;78:1798-1802. (from Pfam)
HigA family addiction module antitoxin
Members of this family form a distinct clade within the larger family HTH_3 of helix-turn-helix proteins, described by Pfam model PF01381. Members of this clade are strictly bacterial and nearly always shorter than 110 amino acids. This family includes the characterized member HigA, without which the killer protein HigB cannot be cloned. The hig (host inhibition of growth) system is noted to be unusual in that killer protein is uncoded by the upstream member of the gene pair.
transcriptional regulator
helix-turn-helix-type transcriptional regulator
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