ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis

In organello starch biosynthesis was studied using intact chloroplasts isolated from spinach leaves (Spinacia oleracea). Immunoblot analysis using a specific antiserum against the mitochondrial adenylate (ADP/ATP) translocator of Neurospora crassa shows the presence of an adenylate translocator prot...

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Detalles Bibliográficos
Autor principal: Ardila, Fernando Jorge
Publicado: 1991
Materias:
Acer
Acer pseudoplatanus
Neurospora crassa
Spinacia oleracea
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320889_v97_n4_p1565_PozuetaRomero
http://hdl.handle.net/20.500.12110/paper_00320889_v97_n4_p1565_PozuetaRomero
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_00320889_v97_n4_p1565_PozuetaRomero
record_format dspace
spelling paper:paper_00320889_v97_n4_p1565_PozuetaRomero2023-06-08T15:00:02Z ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis Ardila, Fernando Jorge Acer Acer pseudoplatanus Neurospora crassa Spinacia oleracea In organello starch biosynthesis was studied using intact chloroplasts isolated from spinach leaves (Spinacia oleracea). Immunoblot analysis using a specific antiserum against the mitochondrial adenylate (ADP/ATP) translocator of Neurospora crassa shows the presence of an adenylate translocator protein in the chloroplast envelope membranes, similar to that existing in mitochondria and amyloplasts from cultured cells of sycamore (Acer pseudoplatanus). The double silicone oil layer-filtering centrifugation technique was employed to study the kinetic properties of adenylate transport in the purified chloroplasts; ATP, ADP, AMP, and most importantly ADP-Glc were shown to be recognized by the adenylate translocator. Similar to the situation with sycamore amyloplasts, only ATP and ADP-Glc uptake was inhibited by carboxyatractyloside, an inhibitor of the mitochondrial adenylate translocator. Evidence is presented to show that the ADP-Glc transported into the chloroplast stroma is utilized for starch synthesis catalyzed by starch synthase (ADP-Glc: 1,4-α-d-glucan 4-α-d-glucosyltransferase). The high activity of sucrose synthase producing ADP-Glc observed in the extrachloroplastic fractions suggests that starch biosynthesis in chloroplasts may be coupled with the direct import of ADP-Glc from the cytosol. Fil:Ardila, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 1991 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320889_v97_n4_p1565_PozuetaRomero http://hdl.handle.net/20.500.12110/paper_00320889_v97_n4_p1565_PozuetaRomero
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Acer
Acer pseudoplatanus
Neurospora crassa
Spinacia oleracea
spellingShingle Acer
Acer pseudoplatanus
Neurospora crassa
Spinacia oleracea
Ardila, Fernando Jorge
ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
topic_facet Acer
Acer pseudoplatanus
Neurospora crassa
Spinacia oleracea
description In organello starch biosynthesis was studied using intact chloroplasts isolated from spinach leaves (Spinacia oleracea). Immunoblot analysis using a specific antiserum against the mitochondrial adenylate (ADP/ATP) translocator of Neurospora crassa shows the presence of an adenylate translocator protein in the chloroplast envelope membranes, similar to that existing in mitochondria and amyloplasts from cultured cells of sycamore (Acer pseudoplatanus). The double silicone oil layer-filtering centrifugation technique was employed to study the kinetic properties of adenylate transport in the purified chloroplasts; ATP, ADP, AMP, and most importantly ADP-Glc were shown to be recognized by the adenylate translocator. Similar to the situation with sycamore amyloplasts, only ATP and ADP-Glc uptake was inhibited by carboxyatractyloside, an inhibitor of the mitochondrial adenylate translocator. Evidence is presented to show that the ADP-Glc transported into the chloroplast stroma is utilized for starch synthesis catalyzed by starch synthase (ADP-Glc: 1,4-α-d-glucan 4-α-d-glucosyltransferase). The high activity of sucrose synthase producing ADP-Glc observed in the extrachloroplastic fractions suggests that starch biosynthesis in chloroplasts may be coupled with the direct import of ADP-Glc from the cytosol.
author Ardila, Fernando Jorge
author_facet Ardila, Fernando Jorge
author_sort Ardila, Fernando Jorge
title ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
title_short ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
title_full ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
title_fullStr ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
title_full_unstemmed ADP-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
title_sort adp-glucose transport by the chloroplast adenylate translocator is linked to starch biosynthesis
publishDate 1991
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00320889_v97_n4_p1565_PozuetaRomero
http://hdl.handle.net/20.500.12110/paper_00320889_v97_n4_p1565_PozuetaRomero
work_keys_str_mv AT ardilafernandojorge adpglucosetransportbythechloroplastadenylatetranslocatorislinkedtostarchbiosynthesis
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