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An individual motif usually consists of only a few elements, e.g., the 'helix-turn-helix' motif which has just three. Note that, while the spatial sequence of elements may be identical in all instances of a motif, they may be encoded in any order within the underlying gene. In addition to secondary structural elements, protein structural motifs ...
A theme is usually defined as a message, statement, or idea, while a motif is simply a detail repeated for larger symbolic meaning. In other words, a narrative motif—a detail repeated in a pattern of meaning—can produce a theme; but it can also create other narrative aspects.
When a sequence motif appears in the exon of a gene, it may encode the "structural motif" of a protein; that is a stereotypical element of the overall structure of the protein. Nevertheless, motifs need not be associated with a distinctive secondary structure .
English. Read; Edit; View history ... a motif is a recurring element or theme in a work ... Structural motif, a pattern in a protein structure formed by the spatial ...
A melodic motif is a melodic formula, established without reference to intervals. A rhythmic motif is the term designating a characteristic rhythmic formula, an abstraction drawn from the rhythmic values of a melody. A motif thematically associated with a person, place, or idea is called a leitmotif or idée fixe. [7]
According to one definition, a turn is a structural motif where the C α atoms of two residues separated by a few (usually 1 to 5) peptide bonds are close (less than 7 Å [0.70 nm]). [1] The proximity of the terminal C α atoms often correlates with formation of an inter main chain hydrogen bond between the corresponding residues. Such hydrogen ...
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The main chain atoms form part of an incomplete ring with the NH groups all pointing roughly towards the centre of the ring. Because their concavities are often wider than simple nests, compound nests are commonly employed by proteins for binding multi-atom anions such as phosphates, as in the P-loop or Walker motifs, and in iron-sulphur clusters.