Linked Life Data

10379641

Source:http://linkedlifedata.com/resource/pubmed/id/10379641

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1999-7-23
pubmed:abstractText
The data on the organization and function of the photosystem I pigment-protein complexes of the cyanobacterium Spirulina and the characteristics of pigment antenna of the photosystem I monomeric and trimeric core complexes are presented and discussed. We proved that the photosystem I complexes in the cyanobacterial membrane pre-exist mainly as trimers, though both types of complexes contribute to the photosynthetic electron transport. In contrast to monomers, the antenna of the photosystem I trimeric complexes of Spirulina contains the extreme long-wave chlorophyll form absorbing at 735 nm and emitting at 760 nm (77 K). The intensity of fluorescence at 760 nm depends strongly on the P700 redox state: it is maximum with the reduced P700 and strongly decreased with the oxidized P700 which is the most efficient quencher of fluorescence at 760 nm. The energy absorbed by the extreme long-wave chlorophyll form is active in the photooxidation of P700 in the trimeric complex. The data obtained indicate that the long-wave form of chlorophyll originates from interaction of the chlorophyll molecules localized on monomeric subunits forming the photosystem I trimer. Kinetic analysis of the P700 photooxidation and light-induced quenching of fluorescence at 760 nm (77 K) allows the suggestion that the excess energy absorbed by the antenna monomeric subunits within the trimer migrates via the extreme long-wave chlorophyll to the P700 cation radical and is quenched, which prevents the photodestruction of the pigment-protein complex.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
1023-6597
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
571-84
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Organization and role of the long-wave chlorophylls in the photosystem I of the Cyanobacterium spirulina.
pubmed:affiliation
Bakh Institute of Biochemistry, Russian Academy of Sciences, Moscow. inbio@glas.acp.org
pubmed:publicationType
Journal Article, Review, Research Support, Non-U.S. Gov't