beta barrel


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beta barrel

A protein structural motif consisting of antiparallel beta strands that form a hydrophobic protein core with a large beta-sheet that twists and coils, resulting in a closed structure in which the first strand is hydrogen bonded to the last. Beta barrels are found in porins and transmembrane proteins and encoded by up to 3% of gram-negative bacterial genes.
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A beta barrel transmembrane protein usually consists of a barrel shape being formed by a coil structure of beta sheets.
In addition, X-ray data show that the chromophore responsible for the fluorescence lies within the beta barrel and is tilted approximately 60 degrees to the long axis of the barrel.
Erickson, in collaboration with Jane and David Richardson of Duke University in Durham, N.C., devised a sequence of amino acids that comprises a structure far more regular than any "beta barrels" seen in nature.