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Dynamic Light-Induced Protein Patterns at Model Membranes
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Xanthophylls as modulators of membrane protein function.

Alexander V Ruban1, Matthew P Johnson

  • 1School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom. a.ruban@qmul.ac.uk

Archives of Biochemistry and Biophysics
|July 10, 2010
PubMed
Summary

Xanthophylls

Area of Science:

  • Plant Biology
  • Photosynthesis Research
  • Molecular Biophysics

Background:

  • Photosynthetic antenna xanthophylls play crucial roles in light harvesting and photoprotection.
  • Their structural properties, including hydrophobicity and polarity, are key to understanding their function.
  • Xanthophylls influence membrane organization and the activity of membrane proteins, particularly in photosystem II.

Purpose of the Study:

  • To review the structural aspects of xanthophylls and their role in photosynthesis.
  • To explore how xanthophyll hydrophobicity/polarity influences their variety and function.
  • To investigate the relationship between xanthophyll composition, membrane protein function, and energy dissipation.

Main Methods:

  • Structural analysis of xanthophyll molecules in relation to amphiphilic compounds.

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  • Examination of xanthophyll composition in membrane proteins, exemplified by the light-harvesting complex II (LHCII).
  • Introduction of a hydrophobicity parameter (H-parameter) to quantify xanthophyll hydrophobicity in LHCII.

    • Main Results:

    • Xanthophyll hydrophobicity/polarity is proposed as an explanation for xanthophyll diversity and function.
    • A strong correlation was found between the H-parameter of LHCII xanthophylls and Photosystem II (PSII) quantum efficiency.
    • Non-photochemical chlorophyll fluorescence quenching (NPQ) regulation is linked to xanthophyll polarity/hydrophobicity changes, explaining its allosteric nature and hysteresis.

    Conclusions:

    • Xanthophyll structure and hydrophobicity are critical determinants of their functional roles in photosynthesis.
    • The H-parameter provides a valuable metric for assessing xanthophyll influence on PSII efficiency.
    • Xanthophyll cycle activity modulates NPQ through alterations in xanthophyll polarity, impacting light energy dissipation.