Linked Life Data

18093994

Source:http://linkedlifedata.com/resource/pubmed/id/18093994

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2008-2-21
pubmed:abstractText
Eukaryotic cells are composed of a variety of membrane-bound organelles that are thought to derive from symbiotic associations involving bacteria, archaea, or other eukaryotes. In addition to acquiring the plastid, all Archaeplastida and some of their endosymbiotic derivatives can be distinguished from other organisms by the fact that they accumulate starch, a semicrystalline-storage polysaccharide distantly related to glycogen and never found elsewhere. We now provide the first evidence for the existence of starch in a particular species of single-cell diazotrophic cyanobacterium. We provide evidence for the existence in the eukaryotic host cell at the time of primary endosymbiosis of an uridine diphosphoglucose (UDP-glucose)-based pathway similar to that characterized in amoebas. Because of the monophyletic origin of plants, we can define the genetic makeup of the Archaeplastida ancestor with respect to storage polysaccharide metabolism. The most likely enzyme-partitioning scenario between the plastid's ancestor and its eukaryotic host immediately suggests the precise nature of the ancient metabolic symbiotic relationship. The latter consisted in the export of adenosine diphosphoglucose (ADP-glucose) from the cyanobiont in exchange for the import of reduced nitrogen from the host. We further speculate that the monophyletic origin of plastids may lie in an organism with close relatedness to present-day group V cyanobacteria.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1537-1719
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
25
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
536-48
pubmed:dateRevised
2010-11-18
pubmed:meshHeading
pubmed:year
2008
pubmed:articleTitle
Metabolic symbiosis and the birth of the plant kingdom.
pubmed:affiliation
Université des Sciences et Technologies de Lille, Unité Mixte de Recherches 8576 du Centre National de la Recherche Scientifique, Cité Scientifique, Villeneuve d'Ascq, France.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't