Linked Life Data

7026240

Source:http://linkedlifedata.com/resource/pubmed/id/7026240

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1981-12-15
pubmed:abstractText
1. When etiolated pea seedlings were exposed to continuous light for 24 h and then returned to darkness, 38% of the chlorophyll a, 74% of the chlorophyll b and 84% of the light-harvesting chlorophyll a/b protein that had accumulated under illumination proved to be unstable in darkness. The unstable chlorophyll displayed a half-life of about 90 min. In contrast, alpha and beta subunits of the chloroplast coupling factor and the large and small subunits of ribulose 1,5-biphosphate carboxylase continued to accumulate in darkness, although at a slower rate than in plants maintained under light. 2. Short-term labelling in vivo with L-[35S]methionine showed that leaves continued to synthesize the light-harvesting protein and the small subunit of ribulose 1,5-biphosphate carboxylase for up to 48 h after transfer of plants from light and darkness. However, after long-term labelling (16 h), the light-harvesting chlorophyll a/b protein was found to be labelled to high specific activity only in illuminated leaves. 3. I conclude that the light-harvesting chlorophyll a/b protein is subject to turnover after transfer of plants from light to darkness. The site of breakdown appears to be the photosynthetic membrane. I suggest that turnover of the protein is part of the normal physiological mechanism for co-ordinating the accumulation of the pigment and protein components of the light-harvesting chlorophyll a/b complex.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0014-2956
pubmed:author
pubmed:issnType
Print
pubmed:volume
118
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
61-70
pubmed:dateRevised
2007-7-23
pubmed:meshHeading
pubmed:year
1981
pubmed:articleTitle
Biosynthesis of the light-harvesting chlorophyll a/b protein. Polypeptide turnover in darkness.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't