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Title: Light-Driven Na + Pump from Gillisia limnaea : A High-Affinity Na + Binding Site Is Formed Transiently in the Photocycle

Journal Article · · Biochemistry
DOI:https://doi.org/10.1021/bi501064n· OSTI ID:1165228
 [1];  [1];  [1];  [1];  [2];  [1]
  1. Department of Physiology and Biophysics, University of California, Irvine, California 92697, United States
  2. Department of Life Science and Interdisciplinary Program of Integrated Biotechnology, Sogang University, Shinsu-Dong 1, Mapo-Gu, Seoul 121-742, Korea

A group of microbial retinal proteins most closely related to the proton pump xanthorhodopsin has a novel sequence motif and a novel function. Instead of, or in addition to, proton transport, they perform light-driven sodium ion transport, as reported for one representative of this group (KR2) from Krokinobacter. In this paper, we examine a similar protein, GLR from Gillisia limnaea, expressed in Escherichia coli, which shares some properties with KR2 but transports only Na+. The absorption spectrum of GLR is insensitive to Na+ at concentrations of ≤3 M. However, very low concentrations of Na+ cause profound differences in the decay and rise time of photocycle intermediates, consistent with a switch from a “Na+-independent” to a “Na+-dependent” photocycle (or photocycle branch) at ~60 μM Na+. The rates of photocycle steps in the latter, but not the former, are linearly dependent on Na+ concentration. This suggests that a high-affinity Na+ binding site is created transiently after photoexcitation, and entry of Na+ from the bulk to this site redirects the course of events in the remainder of the cycle. A greater concentration of Na+ is needed for switching the reaction path at lower pH. The data suggest therefore competition between H+ and Na+ to determine the two alternative pathways. The idea that a Na+ binding site can be created at the Schiff base counterion is supported by the finding that upon perturbation of this region in the D251E mutant, Na+ binds without photoexcitation. Furthermore, binding of Na+ to the mutant shifts the chromophore maximum to the red like that of H+, which occurs in the photocycle of the wild type.

Research Organization:
Univ. of California, Irvine, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
DEFG03-86ER13525; FG03-86ER13525
OSTI ID:
1165228
Alternate ID(s):
OSTI ID: 1345588
Journal Information:
Biochemistry, Journal Name: Biochemistry Vol. 53 Journal Issue: 48; ISSN 0006-2960
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 65 works
Citation information provided by
Web of Science

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Figures / Tables (10)


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