Tryptophan synthase forms a ABBA tetramer (PDB 2J9X). It is not exactly what you want, but it is different from what you have found.
Jack Tanner
John J. Tanner
Professor of Chemistry and Biochemistry
University of Missouri-Columbia
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On Feb 25, 2012, at 6:26 PM, Koustav Maity wrote:
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> Hi all,
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> does anyone know a protein which make hetero tetramer of A2B2 which arrange as<no1.png> and NOT as <no2.png>?
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> Its great if these proteins are small? All the hetero tetramer I found was of <no2.png> type.
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> Thanks
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> Dhiraj
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