Linked Life Data

16661336

Source:http://linkedlifedata.com/resource/pubmed/id/16661336

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2010-6-29
pubmed:abstractText
The application of neutral or acidic amino acids to oat coleptiles induced transient depolarizations of the membrane potentials. The depolarizations are considered to reflect H(+) -amino acid co-transport, and the spontaneous repolarizations are believed to be caused by subsequent electrogenic H(+) extrusion. The basic amino acids depolarized the cell membrane strongly, but the repolarizations were weak or absent. The depolarizations induced by the basic amino acids were weakly sensitive to manipulations of the extracellular and intracellular pH. The depolarizations induced by the other amino acids, in contrast, were more strongly affected by the pH changes. Several amino acids induced distinct but diminished depolarizations in the presence of 2,4-dinitrophenol or cyanide, but the repolarizations were generally eliminated. These experiments support the co-transport theory but suggest somewhat different mechanisms for the transport of the neutral, acidic, and basic amino acids. We suggest that the neutral amino acids are co-transported with a single H(+) and that accumulation depends upon both the DeltapH and the membrane potential components of the proton motive force. The acidic amino acids appear to be accumulated by a similar mechanism except that the transport of each molecule may be associated with a cation in addition to a single proton. The permanently protonated basic amino acids appear not to be co-transported with an additional proton. Accumulation would depend only on the membrane potential component of the proton motive force.
pubmed:commentsCorrections
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Jun
pubmed:issn
0032-0889
pubmed:author
pubmed:issnType
Print
pubmed:volume
65
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1085-9
pubmed:dateRevised
2010-9-15
pubmed:year
1980
pubmed:articleTitle
Electrical evidence for different mechanisms of uptake for basic, neutral, and acidic amino acids in oat coleoptiles.
pubmed:affiliation
Department of Botany, University of Vermont, Burlington, Vermont 05405.
pubmed:publicationType
Journal Article