Linked Life Data

15554705

Source:http://linkedlifedata.com/resource/pubmed/id/15554705

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
47
pubmed:dateCreated
2004-11-23
pubmed:abstractText
Slr1694 in Synechocystis sp. PCC6803 is a family of blue-light photoreceptors based on flavin adenine dinucleotide (FAD) called BLUF (sensor of blue light using FAD) proteins, which include AppA from Rhodobacter sphaeroides and PAC from Euglena gracilis. Illumination of dark-state Slr1694 at 15 degrees C reversibly induced a signaling light state characterized by the red shift in the UV-visible spectrum and by the light-induced Fourier transform infrared (FTIR) difference spectrum for structural changes of a bound flavin and apo protein. Illumination at the medium-low temperature (-35 degrees C) led to the red shift in the UV-visible spectrum despite some small difference in the light-induced changes. In contrast, the -35 degrees C illumination resulted in a completely different light-induced FTIR spectrum, in which almost all of the bands were suppressed with the exception of the bands for the change of C4=O bonding of the FAD isoalloxazine ring. The C4=O bands were induced at -35 degrees C with almost the same intensity, but the band frequency for the light state was upshifted by 6 cm(-)(1). The changes in frequency of the light-state C4=O band and in amplitude of other bands showed the same temperature dependence with a half-change temperature at approximately -20 degrees C. It was indicated that the light-induced structural changes of apo protein and FAD were inhibited at low temperature with the exception of the change in hydrogen bonding to the C4=O group. The light-induced formation of the FTIR bands was similarly inhibited by sample dehydration. We discussed the possibility that this constrained light state is a trapped intermediate state in the photocycle of Slr1694.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
30
pubmed:volume
43
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
14979-86
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
Structural intermediate in the photocycle of a BLUF (sensor of blue light using FAD) protein Slr1694 in a Cyanobacterium Synechocystis sp. PCC6803.
pubmed:affiliation
Laboratory for Photo-Biology, RIKEN Photodynamics Research Center, The Institute of Physical and Chemical Research, 519-1399 Aoba, Aramaki, Aoba, Sendai 980-0845, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't