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Science 8 October 1999:
Vol. 286. no. 5438, pp. 255 - 260
DOI: 10.1126/science.286.5438.255
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Research Articles

Structural Changes in Bacteriorhodopsin During Ion Transport at 2 Angstrom Resolution

Hartmut Luecke, 123* Brigitte Schobert, 23 Hans-Thomas Richter, 23 Jean-Philippe Cartailler, 13 Janos K. Lanyi 23*

Crystal structures of the Asp96 to Asn mutant of the light-driven proton pump bacteriorhodopsin and its M photointermediate produced by illumination at ambient temperature have been determined to 1.8 and 2.0 angstroms resolution, respectively. The trapped photoproduct corresponds to the late M state in the transport cycle--that is, after proton transfer to Asp85 and release of a proton to the extracellular membrane surface, but before reprotonation of the deprotonated retinal Schiff base. Its density map describes displacements of side chains near the retinal induced by its photoisomerization to 13-cis,15-anti and an extensive rearrangement of the three-dimensional network of hydrogen-bonded residues and bound water that accounts for the changed pKa values (where Ka is the acid constant) of the Schiff base and Asp85. The structural changes detected suggest the means for conserving energy at the active site and for ensuring the directionality of proton translocation.

1 Department of Molecular Biology and Biochemistry,
2 Department of Physiology and Biophysics,
3 UCI Program in Macromolecular Structure, University of California, Irvine, CA 92697, USA.
*   To whom correspondence should be addressed. E-mail: hudel{at}uci.edu or jlanyi{at}orion.oac.uci.edu

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