The omega loop is a motif of the secondary structure of proteins, found in particular on the surface of globular proteins. It consists of a loop of any length and any amino acid sequence. The only requirement is that the residues that make up the beginning and end of the loop are very close, they were first described in 1986 and they are named after their shape resembling the Greek letter omega in capital letters. participate in the molecular recognition, stability and folding of the protein.For example, in the enzyme triose phosphate isomerase forms an interaction that stabilizes two domains of the protein in a dimer.

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