NDLI: Rhodopsin-to-metarhodopsin II transition triggers amplified changes in cytosol ATP and ADP in intact retinal rod outer segments.

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Rhodopsin-to-metarhodopsin II transition triggers amplified changes in cytosol ATP and ADP in intact retinal rod outer segments.

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Rhodopsin-to-metarhodopsin II transition triggers amplified changes in cytosol ATP and ADP in intact retinal rod outer segments.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Schmidt, G. J. Zuckerman, R. Dacko, S. M.
Abstract	We have observed rapid, light-initiated changes in unbound cytosol ATP and ADP during the rhodopsin-to-metarhodopsin II transition in intact rod outer segments (ROS). Upon illumination of the ROS, ATP is rapidly removed from the unbound phase of ROS, accompanied by the concomitant release of ADP into the cytosol. The exchange process involves decreases of approximately equal to 0.5 mM ATP in ROS cytosol ATP content in response to a saturating flash. At levels of light well below saturation (less than 0.001% bleach), the process is highly amplified, with a decrease in cytosol ATP of approximately equal to 2,000 ATP molecules per absorbed photon per ROS. Rapid time-resolution techniques reveal that cytosol ATP content decreases rapidly, within 250 msec of a saturating flash. Bleaching rhodopsin to metarhodopsin II results in a decrease in cytosol ATP, accompanied by an increase in cytosol ADP, whereas photoreversal of metarhodopsin II by a blue flash reverses the process, increasing ATP concentration to its control level in the dark. The photoreversibility of the ATP decrease during the rhodopsin-to-metarhodopsin II transition establishes a direct link between the state of an early intermediate of photolyzed rhodopsin and the state of a nucleoside triphosphate in intact ROS. The results are consistent with a light-activated exchange of unbound ATP for bound ADP, and we propose, therefore, an ATP/ADP amplification cycle in which metarhodopsin II catalyzes the exchange of ATP for ADP on a nucleotide binding protein.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	21
Volume Number	79
Language	English
Publisher	National Academy of Sciences
Publisher Date	1982-01-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Adenosine Triphosphate Metabolism Photoreceptor Cells Physiology Retinal Pigments Rhodopsin Rod Cell Outer Segment Vision, Ocular Adenosine Diphosphate Animals Cytosol Kinetics Rana Catesbeiana Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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