Linked Life Data

20480090

Source:http://linkedlifedata.com/resource/pubmed/id/20480090

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-6-1
pubmed:abstractText
Our observation that the F735/F685 ratio at 77 K increased when the lumenal pH decreased led us to investigate the role of pH in explaining the mechanism of state transitions in spinach (Spinacea oleracea L.) thylakoid membranes. As the lumenal pH was changed from pH 7.5 to 5.5, the quantum yield of PS II decreased, while that of PS I increased. In the presence of an uncoupler, NH(4)Cl, which sequesters protons, a reversal of the effects observed at pH 5.5 were noticed. The thylakoid membranes treated with NaF at pH 5.5, when suspended in a buffer of pH 7.5, showed enhanced PS II fluorescence and a decreased PS I fluorescence, suggesting migration of LHC II back to PS II from PS I. The results presented here suggest for the first time that the lumenal pH of thylakoid membranes regulates the migration of antenna, and hence the energy distribution, between the two photosystems, i.e. a low lumenal pH (pH 5.5) favors antenna migration from PS II to PS I. At pH 7.5, the deprotonation of LHC II antenna attached to PS I leads to back migration of LHC II to PS II.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1474-9092
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
9
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
830-7
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed:year
2010
pubmed:articleTitle
Evidence that pH can drive state transitions in isolated thylakoid membranes from spinach.
pubmed:affiliation
School of Life Sciences, Vigyan Bhavan, Khandwa Road, Devi Ahilya University, Indore, 452 017 (MP), India.
pubmed:publicationType
Journal Article