helix-turn-helix (helix-loop-helix) A structural motif characteristic of certain proteins that bind to DNA. It consists of two alpha helices connected by a short nonhelical segment called a ‘turn’. One of the helical segments recognizes a specific sequence of nucleotides in the DNA molecule and fits into the groove in the DNA double helix, while the other helix stabilizes the bound configuration. This motif is one of several found in DNA-binding proteins (see also leucine zipper; zinc finger).
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Turn , turn / tərn/ • v. 1. move or cause to move in a circular direction wholly or partly around an axis or point: [intr.] the big wheel was turning | [tr.… Contrabassoon , double bassoon (contrabassoon; Fr. ‘contrebasson’; Ger. ‘Kontrafagott’). Wind instr. octave deeper than bassoon and notated octave higher than it sou… Psychrometer , psychrometer A hygrometer that has a wet-bulb and a dry-bulb thermometer. See also whirling psychrometer. psychrometer Hygrometer with a wet-bulb and… Blackburn , Blackburn •adjourn, astern, Berne, burn, churn, concern, discern, earn, fern, fohn, kern, learn, Lucerne, quern, Sauternes, spurn, stern, Sterne, ter… Lisburn , Lisburn •adjourn, astern, Berne, burn, churn, concern, discern, earn, fern, fohn, kern, learn, Lucerne, quern, Sauternes, spurn, stern, Sterne, tern,… corpus allatum , corpus allatum (pl. corpora allata) One of the glandular organs found on either side of the oesophagus in most insects, although they may become fuse…
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