Citrate transport into barley mesophyll vacuoles — comparison with malate-uptake activity View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1991-07

AUTHORS

Doris Rentsch, Enrico Martinoia

ABSTRACT

Citrate uptake into barley (Hordeum vulgare L.) mesophyll vacuoles was found to be saturable with a Km of about 200 μM. Uptake appears to occur via the citrate3- form, as indicated by concentration-dependent uptake studies at different pHs. Free citrate and not the Mg-citrate complex was taken up by the vacuoles, even though slow transport of the Mg complex could not be excluded. Citrate transport into vacuoles was competitively inhibited by malate (Ki=0.68 mM). Various organic acids and protein-modifying agents affected the uptake of malate and citrate to a similar extent. These results indicate that both organic acids cross the tonoplast by means of the same carrier. Accumulation of citrate was ATP-dependent and could be inhibited by ionophores. Bovine serum albumin strongly stimulated citrate uptake, but other proteins tested did not show a similar stimulatory effect. More... »

PAGES

532-537

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00197903

DOI

http://dx.doi.org/10.1007/bf00197903

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1046112909

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/24194244


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