PMID- 12119389
OWN - NLM
STAT- MEDLINE
DCOM- 20020904
LR  - 20170219
IS  - 0027-8424 (Print)
IS  - 0027-8424 (Linking)
VI  - 99
IP  - 15
DP  - 2002 Jul 23
TI  - The structures of the active center in dark-adapted bacteriorhodopsin by
      solution-state NMR spectroscopy.
PG  - 9765-70
AB  - The two forms of bacteriorhodopsin present in the dark-adapted state, containing 
      either all-trans or 13-cis,15-syn retinal, were examined by using solution state 
      NMR, and their structures were determined. Comparison of the all-trans and the
      13-cis,15-syn forms shows a shift in position of about 0.25 A within the pocket
      of the protein. Comparing this to the 13-cis,15-anti chromophore of the catalytic
      cycle M-intermediate structure, the 13-cis,15-syn form demonstrates a less
      pronounced up-tilt of the retinal C12[bond]C14 region, while leaving W182 and
      T178 essentially unchanged. The N[bond]H dipole of the Schiff base orients toward
      the extracellular side in both forms, however, it reorients toward the
      intracellular side in the 13-cis,15-anti configuration to form the catalytic
      M-intermediate. Thus, the change of the N[bond]H dipole is considered primarily
      responsible for energy storage, conformation changes of the protein, and the
      deprotonation of the Schiff base. The structural similarity of the all-trans and 
      13-cis,15-syn forms is taken as strong evidence for the ion dipole dragging model
      by which proton (hydroxide ion) translocation follows the change of the dipole.
FAU - Patzelt, Heiko
AU  - Patzelt H
AD  - Max-Planck-Institut fur Biochemie, Abteilung Membranbiochemie, Am Klopferspitz
      18a, 82152 Martinsried, Germany;.
FAU - Simon, Bernd
AU  - Simon B
FAU - terLaak, Antonius
AU  - terLaak A
FAU - Kessler, Brigitte
AU  - Kessler B
FAU - Kuhne, Ronald
AU  - Kuhne R
FAU - Schmieder, Peter
AU  - Schmieder P
FAU - Oesterhelt, Dieter
AU  - Oesterhelt D
FAU - Oschkinat, Hartmut
AU  - Oschkinat H
LA  - eng
PT  - Journal Article
DEP - 20020715
PL  - United States
TA  - Proc Natl Acad Sci U S A
JT  - Proceedings of the National Academy of Sciences of the United States of America
JID - 7505876
RN  - 53026-44-1 (Bacteriorhodopsins)
SB  - IM
MH  - Amino Acid Sequence
MH  - Bacteriorhodopsins/*chemistry
MH  - Binding Sites
MH  - Darkness
MH  - Magnetic Resonance Spectroscopy/methods
MH  - Models, Molecular
MH  - Protein Conformation
PMC - PMC125008
OID - NLM: PMC125008
EDAT- 2002/07/18 10:00
MHDA- 2002/09/06 10:01
CRDT- 2002/07/18 10:00
PHST- 2002/07/18 10:00 [pubmed]
PHST- 2002/09/06 10:01 [medline]
PHST- 2002/07/18 10:00 [entrez]
AID - 10.1073/pnas.132253899 [doi]
AID - 132253899 [pii]
PST - ppublish
SO  - Proc Natl Acad Sci U S A. 2002 Jul 23;99(15):9765-70. doi:
      10.1073/pnas.132253899. Epub 2002 Jul 15.