Linked Life Data

16851865

Source:http://linkedlifedata.com/resource/pubmed/id/16851865

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
15
pubmed:dateCreated
2006-7-20
pubmed:abstractText
The transient radical pair P(+)Q(A)(-) in the photosynthetic reaction center from Rhodobacter sphaeroides R26 was studied over a wide temperature range using out-of-phase electron spin-echo envelope modulation (ESEEM) spectroscopy. This method is sensitive to the magnetic dipole-dipole interaction between the two electron spins of the pair and allows precise determination of the distance in the pair P(+)Q(A)(-). The out-of-phase data were complemented by normal in-phase ESEEM spectra from the two stable radicals of P(+) and Q(A)(-). The results seem to indicate that the radical pair undergoes a noticeable molecular motion around 200 K that may be characterized by a change in the distance in the pair by approximately 0.3 nm. As the two cofactors, P(+) and Q(A)(-), are held in a well-defined relative position by the reaction center protein, this means that the protein becomes flexible at 200 K. This effect may be ascribed to a dynamic glass transition around 200 K. The relation with the temperature dependence of the back reaction of P(+)Q(A)(-) is discussed.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
1520-6106
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
109
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
7535-9
pubmed:meshHeading
pubmed:year
2005
pubmed:articleTitle
"Glass transition" near 200 K in the bacterial photosynthetic reaction center protein detected by studying the distances in the transient P+Q(A)- radical pair.
pubmed:affiliation
Department of Biophysics, Huygens Laboratory, Leiden University, P.O. Box 9504, 2300 RA Leiden, The Netherlands.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't