Interaction of monogalactosyldiacylglycerol with cytochrome b₆f complex in surface films.
Identifieur interne : 002B21 ( Main/Corpus ); précédent : 002B20; suivant : 002B22Interaction of monogalactosyldiacylglycerol with cytochrome b₆f complex in surface films.
Auteurs : G As Georgiev ; Sl Ivanova ; A. Jordanova ; A. Tsanova ; V. Getov ; M. Dimitrov ; Z. LalchevSource :
- Biochemical and biophysical research communications [ 1090-2104 ] ; 2012.
English descriptors
- KwdEn :
- MESH :
- chemical , chemistry : Cytochrome b6f Complex, Galactolipids, Galactose.
- chemistry : Thylakoids.
- enzymology : Populus.
- Hydrogen Bonding, Surface Properties.
Abstract
The interaction of monogalactosyldiacylglycerol (MGDG) with cytochrome b(6)f complex (cyt b(6)f), a major component of the photosynthetic apparatus, was studied in Langmuir monolayers during compression/expansion cycling and at constant surface pressure mode. The surface pressure/area isotherms of the mixed films were analyzed in terms of surface compressional modulus and two-dimensional virial equation of state. The morphology and the surface potential of the monolayers were monitored by Brewster angle microscopy and vibrating plate sensor respectively. Our results suggested that there is a specific interaction between MGDG and cyt b(6)f which resulted in depletion of lipid molecules from the interface. The current work sheds light on the still unclear question how b(6)f complex gets in touch with the major compound of the thylakoid membranes, the non-charged lipid MGDG. The interaction occured even at very low sub-nanomolar concentration of the complex. This effect most probably could be attributed to hydrogen bonding between the galactose headgroup of the lipid and the protein moiety of cyt b(6)f.
DOI: 10.1016/j.bbrc.2012.02.067
PubMed: 22374069
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pubmed:22374069Le document en format XML
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<author><name sortKey="Georgiev, G As" sort="Georgiev, G As" uniqKey="Georgiev G" first="G As" last="Georgiev">G As Georgiev</name>
<affiliation><nlm:affiliation>Faculty of Biology, St. Kl. Ohridski University of Sofia, 8 Dragan Tsankov Blvd., 1164 Sofia, Bulgaria. ggeorg@biofac.uni-sofia.bg</nlm:affiliation>
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<author><name sortKey="Ivanova, Sl" sort="Ivanova, Sl" uniqKey="Ivanova S" first="Sl" last="Ivanova">Sl Ivanova</name>
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<author><name sortKey="Jordanova, A" sort="Jordanova, A" uniqKey="Jordanova A" first="A" last="Jordanova">A. Jordanova</name>
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<author><name sortKey="Tsanova, A" sort="Tsanova, A" uniqKey="Tsanova A" first="A" last="Tsanova">A. Tsanova</name>
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<author><name sortKey="Getov, V" sort="Getov, V" uniqKey="Getov V" first="V" last="Getov">V. Getov</name>
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<author><name sortKey="Dimitrov, M" sort="Dimitrov, M" uniqKey="Dimitrov M" first="M" last="Dimitrov">M. Dimitrov</name>
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<author><name sortKey="Lalchev, Z" sort="Lalchev, Z" uniqKey="Lalchev Z" first="Z" last="Lalchev">Z. Lalchev</name>
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<author><name sortKey="Georgiev, G As" sort="Georgiev, G As" uniqKey="Georgiev G" first="G As" last="Georgiev">G As Georgiev</name>
<affiliation><nlm:affiliation>Faculty of Biology, St. Kl. Ohridski University of Sofia, 8 Dragan Tsankov Blvd., 1164 Sofia, Bulgaria. ggeorg@biofac.uni-sofia.bg</nlm:affiliation>
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<author><name sortKey="Ivanova, Sl" sort="Ivanova, Sl" uniqKey="Ivanova S" first="Sl" last="Ivanova">Sl Ivanova</name>
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<author><name sortKey="Tsanova, A" sort="Tsanova, A" uniqKey="Tsanova A" first="A" last="Tsanova">A. Tsanova</name>
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<author><name sortKey="Getov, V" sort="Getov, V" uniqKey="Getov V" first="V" last="Getov">V. Getov</name>
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<author><name sortKey="Dimitrov, M" sort="Dimitrov, M" uniqKey="Dimitrov M" first="M" last="Dimitrov">M. Dimitrov</name>
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<author><name sortKey="Lalchev, Z" sort="Lalchev, Z" uniqKey="Lalchev Z" first="Z" last="Lalchev">Z. Lalchev</name>
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<series><title level="j">Biochemical and biophysical research communications</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cytochrome b6f Complex (chemistry)</term>
<term>Galactolipids (chemistry)</term>
<term>Galactose (chemistry)</term>
<term>Hydrogen Bonding (MeSH)</term>
<term>Populus (enzymology)</term>
<term>Surface Properties (MeSH)</term>
<term>Thylakoids (chemistry)</term>
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<keywords scheme="MESH" type="chemical" qualifier="chemistry" xml:lang="en"><term>Cytochrome b6f Complex</term>
<term>Galactolipids</term>
<term>Galactose</term>
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<keywords scheme="MESH" qualifier="chemistry" xml:lang="en"><term>Thylakoids</term>
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<keywords scheme="MESH" qualifier="enzymology" xml:lang="en"><term>Populus</term>
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<keywords scheme="MESH" xml:lang="en"><term>Hydrogen Bonding</term>
<term>Surface Properties</term>
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<front><div type="abstract" xml:lang="en">The interaction of monogalactosyldiacylglycerol (MGDG) with cytochrome b(6)f complex (cyt b(6)f), a major component of the photosynthetic apparatus, was studied in Langmuir monolayers during compression/expansion cycling and at constant surface pressure mode. The surface pressure/area isotherms of the mixed films were analyzed in terms of surface compressional modulus and two-dimensional virial equation of state. The morphology and the surface potential of the monolayers were monitored by Brewster angle microscopy and vibrating plate sensor respectively. Our results suggested that there is a specific interaction between MGDG and cyt b(6)f which resulted in depletion of lipid molecules from the interface. The current work sheds light on the still unclear question how b(6)f complex gets in touch with the major compound of the thylakoid membranes, the non-charged lipid MGDG. The interaction occured even at very low sub-nanomolar concentration of the complex. This effect most probably could be attributed to hydrogen bonding between the galactose headgroup of the lipid and the protein moiety of cyt b(6)f.</div>
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<Abstract><AbstractText>The interaction of monogalactosyldiacylglycerol (MGDG) with cytochrome b(6)f complex (cyt b(6)f), a major component of the photosynthetic apparatus, was studied in Langmuir monolayers during compression/expansion cycling and at constant surface pressure mode. The surface pressure/area isotherms of the mixed films were analyzed in terms of surface compressional modulus and two-dimensional virial equation of state. The morphology and the surface potential of the monolayers were monitored by Brewster angle microscopy and vibrating plate sensor respectively. Our results suggested that there is a specific interaction between MGDG and cyt b(6)f which resulted in depletion of lipid molecules from the interface. The current work sheds light on the still unclear question how b(6)f complex gets in touch with the major compound of the thylakoid membranes, the non-charged lipid MGDG. The interaction occured even at very low sub-nanomolar concentration of the complex. This effect most probably could be attributed to hydrogen bonding between the galactose headgroup of the lipid and the protein moiety of cyt b(6)f.</AbstractText>
<CopyrightInformation>Copyright © 2012 Elsevier Inc. All rights reserved.</CopyrightInformation>
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