PHOTOACTIVE TERTHIOPHENES: THE INFLUENCE OF SERUM ON ANTI‐HIV (HUMAN IMMUNODEFICIENCY VIRUS) ACTIVITIES

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Abstract

Abstract Responses of Chlamydomonas to light, such as phototaxis and photophobic response, are thought to depend on a phototransduction process involving rhodopsin and a calcium ion influx at the eyespot. To assess the direction of the chromophore orientation within the eyespot, I measured the membrane current in cells captured by a suction pipette upon stimulation with polarized light. When the cells were stimulated with polarized light incident parallel to the membrane overlying the eyespot, the photoreceptor current was found to change with the direction of the e‐vector. The current was maximum when the e‐vector was parallel to the eyespot membrane and minimal when perpendicular. When the cells were stimulated with light incident perpendicular to the eyespot membrane, the photoreceptor current did not change with the direction of the e‐vector. These results suggest that the chromophore is located in the eyespot and oriented almost parallel to the plane of the membrane of the eyespot. Thus the direction of the chromophore orientation in Chlamydomonas rhodopsin with respect to the membrane is the same as in rhodopsins from bacteria and animals.

Original languageEnglish
Pages (from-to)594-597
Number of pages4
JournalPhotochemistry and Photobiology
Volume60
Issue number6
DOIs
Publication statusPublished - 1994
Externally publishedYes

Fingerprint

human immunodeficiency virus
Viruses
serums
membranes
Membranes
Rhodopsin
Chromophores
chromophores
photoreceptors
Light polarization
polarized light
cells
pipettes
suction
stimulation
bacteria
animals
alpha-terthienyl
calcium
Bacteria

ASJC Scopus subject areas

  • Medicine(all)
  • Biochemistry
  • Physical and Theoretical Chemistry

Cite this

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title = "PHOTOACTIVE TERTHIOPHENES: THE INFLUENCE OF SERUM ON ANTI‐HIV (HUMAN IMMUNODEFICIENCY VIRUS) ACTIVITIES",
abstract = "Abstract Responses of Chlamydomonas to light, such as phototaxis and photophobic response, are thought to depend on a phototransduction process involving rhodopsin and a calcium ion influx at the eyespot. To assess the direction of the chromophore orientation within the eyespot, I measured the membrane current in cells captured by a suction pipette upon stimulation with polarized light. When the cells were stimulated with polarized light incident parallel to the membrane overlying the eyespot, the photoreceptor current was found to change with the direction of the e‐vector. The current was maximum when the e‐vector was parallel to the eyespot membrane and minimal when perpendicular. When the cells were stimulated with light incident perpendicular to the eyespot membrane, the photoreceptor current did not change with the direction of the e‐vector. These results suggest that the chromophore is located in the eyespot and oriented almost parallel to the plane of the membrane of the eyespot. Thus the direction of the chromophore orientation in Chlamydomonas rhodopsin with respect to the membrane is the same as in rhodopsins from bacteria and animals.",
author = "Kenjiro Yoshimura",
year = "1994",
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journal = "Photochemistry and Photobiology",
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N2 - Abstract Responses of Chlamydomonas to light, such as phototaxis and photophobic response, are thought to depend on a phototransduction process involving rhodopsin and a calcium ion influx at the eyespot. To assess the direction of the chromophore orientation within the eyespot, I measured the membrane current in cells captured by a suction pipette upon stimulation with polarized light. When the cells were stimulated with polarized light incident parallel to the membrane overlying the eyespot, the photoreceptor current was found to change with the direction of the e‐vector. The current was maximum when the e‐vector was parallel to the eyespot membrane and minimal when perpendicular. When the cells were stimulated with light incident perpendicular to the eyespot membrane, the photoreceptor current did not change with the direction of the e‐vector. These results suggest that the chromophore is located in the eyespot and oriented almost parallel to the plane of the membrane of the eyespot. Thus the direction of the chromophore orientation in Chlamydomonas rhodopsin with respect to the membrane is the same as in rhodopsins from bacteria and animals.

AB - Abstract Responses of Chlamydomonas to light, such as phototaxis and photophobic response, are thought to depend on a phototransduction process involving rhodopsin and a calcium ion influx at the eyespot. To assess the direction of the chromophore orientation within the eyespot, I measured the membrane current in cells captured by a suction pipette upon stimulation with polarized light. When the cells were stimulated with polarized light incident parallel to the membrane overlying the eyespot, the photoreceptor current was found to change with the direction of the e‐vector. The current was maximum when the e‐vector was parallel to the eyespot membrane and minimal when perpendicular. When the cells were stimulated with light incident perpendicular to the eyespot membrane, the photoreceptor current did not change with the direction of the e‐vector. These results suggest that the chromophore is located in the eyespot and oriented almost parallel to the plane of the membrane of the eyespot. Thus the direction of the chromophore orientation in Chlamydomonas rhodopsin with respect to the membrane is the same as in rhodopsins from bacteria and animals.

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