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News Physiol Sci 18: 191-195, 2003; doi:10.1152/nips.01445.2003
1548-9213/03 $5.00
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News in Physiological Sciences, Vol. 18, No. 5, 191-195, October 2003
© 2003 Int. Union Physiol. Sci./Am. Physiol. Soc.

The Engine of ABC Proteins

Guillermo A. Altenberg

Membrane Protein Laboratory, Sealy Center for Structural Biology, and Department of Physiology and Biophysics, The University of Texas Medical Branch, Galveston, Texas 77555-0437
Proteins that belong to the ATP-binding cassette superfamily span from bacteria to humans and comprise one of the largest protein families. These proteins are characterized by the presence of two nucleotide-binding domains, and recent studies suggest that association and dissociation of these domains is a common basic molecular mechanism of operation that couples ATP binding/hydrolysis to substrate transport across membranes.




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