Crossref journal-article
Wiley
Photochemistry and Photobiology (311)
Abstract

AbstractThe organization of pigment‐protein complexes into large chiral macrodomains was investigated in wild‐type and chlorophyllb‐less mutant thylakoid membranes of barley. The variations in the anomalous circular dichroism bands and in the angular‐dependence of circular intensity differential scattering showed that in wild‐type chloroplasts, the formation of macrodomains was governed by interactions of the light‐harvesting chlorophyllalbcomplexes (LHCII). Two external factors could be identified which regulate the parameters of the anomalous circular dichroism signal: (i) electrostatic screening by divalent cations under conditions that favor membrane stacking and (ii) the osmotic pressure of the medium, which is suggested to affect the lateral interactions between complexes and influence the packing‐density of particles. These two factors governed preferentially the negative and the positive anomalous circular dichroism signals, respectively. In thechlorina f‐2mutant thylakoid membranes, deficient in most chlorophyllbbinding proteins, the formation of macrodomains which gave rise to the anomalous circular dichroism signals was still regulated by these same external factors. However, in the absence of major LHCII polypeptides the formation of macrodomains was apparently mediated by other complexes having weaker interaction capabilities. As a consequence, the size of the macrodomains under comparable conditions appeared smaller in the mutant than in the wild‐type thylakoid membranes.Circular dichroism is a valuable probe for examining the long‐range interactions between pigment‐protein complexes which participate in the formation and stabilization of membrane ultrastruc‐ture. A functional role of macrodomains in long‐range energy migration processes is proposed.

Bibliography

Garab, G., Kieleczawa, J., Sutherland, J. C., Bustamante, C., & Hind, G. (1991). ORGANIZATION OF PIGMENT‐PROTEIN COMPLEXES INTO MACRODOMAINS IN THE THYLAKOID MEMBRANES OF WILD‐TYPE and CHLOROPHYLL fo‐LESS MUTANT OF BARLEY AS REVEALED BY CIRCULAR DICHROISM. Photochemistry and Photobiology, 54(2), 273–281. Portico.

Authors 5
  1. G. Garab (first)
  2. J. Kieleczawa (additional)
  3. J. C. Sutherland (additional)
  4. C. Bustamante (additional)
  5. G. Hind (additional)
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Dates
Type When
Created 17 years, 7 months ago (Jan. 2, 2008, 3:40 p.m.)
Deposited 7 months ago (Jan. 24, 2025, 11:45 p.m.)
Indexed 2 weeks, 4 days ago (Aug. 6, 2025, 9:12 a.m.)
Issued 34 years ago (Aug. 1, 1991)
Published 34 years ago (Aug. 1, 1991)
Published Online 17 years, 7 months ago (Jan. 2, 2008)
Published Print 34 years ago (Aug. 1, 1991)
Funders 0

None

@article{Garab_1991, title={ORGANIZATION OF PIGMENT‐PROTEIN COMPLEXES INTO MACRODOMAINS IN THE THYLAKOID MEMBRANES OF WILD‐TYPE and CHLOROPHYLL fo‐LESS MUTANT OF BARLEY AS REVEALED BY CIRCULAR DICHROISM}, volume={54}, ISSN={1751-1097}, url={http://dx.doi.org/10.1111/j.1751-1097.1991.tb02016.x}, DOI={10.1111/j.1751-1097.1991.tb02016.x}, number={2}, journal={Photochemistry and Photobiology}, publisher={Wiley}, author={Garab, G. and Kieleczawa, J. and Sutherland, J. C. and Bustamante, C. and Hind, G.}, year={1991}, month=aug, pages={273–281} }