Does a voltage-sensitive outer envelope transport mechanism contributes to the chloroplast iron uptake?

Ádám Solti, Krisztina Kovács, Brigitta Müller, Saúl Vázquez, Éva Hamar, Hong Diep Pham, Brigitta Tóth, Javier Abadía, F. Fodor

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Main conclusion: Based on the effects of inorganic salts on chloroplast Fe uptake, the presence of a voltage-dependent step is proposed to play a role in Fe uptake through the outer envelope.Although iron (Fe) plays a crucial role in chloroplast physiology, only few pieces of information are available on the mechanisms of chloroplast Fe acquisition. Here, the effect of inorganic salts on the Fe uptake of intact chloroplasts was tested, assessing Fe and transition metal uptake using bathophenantroline-based spectrophotometric detection and plasma emission-coupled mass spectrometry, respectively. The microenvironment of Fe was studied by Mössbauer spectroscopy. Transition metal cations (Cd2+, Zn2+, and Mn2+) enhanced, whereas oxoanions (NO3, SO42−, and BO33−) reduced the chloroplast Fe uptake. The effect was insensitive to diuron (DCMU), an inhibitor of chloroplast inner envelope-associated Fe uptake. The inorganic salts affected neither Fe forms in the uptake assay buffer nor those incorporated into the chloroplasts. The significantly lower Zn and Mn uptake compared to that of Fe indicates that different mechanisms/transporters are involved in their acquisition. The enhancing effect of transition metals on chloroplast Fe uptake is likely related to outer envelope-associated processes, since divalent metal cations are known to inhibit Fe2+ transport across the inner envelope. Thus, a voltage-dependent step is proposed to play a role in Fe uptake through the chloroplast outer envelope on the basis of the contrasting effects of transition metal cations and oxoaninons.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalPlanta
DOIs
Publication statusAccepted/In press - Aug 19 2016

Fingerprint

Chloroplasts
Iron
chloroplasts
iron
uptake mechanisms
transition elements
Metals
inorganic salts
Diuron
Salts
cations
Cations
diuron
Divalent Cations
Mass Spectrometry
Spectrum Analysis
Buffers
transporters
spectroscopy
buffers

Keywords

  • Chloroplast
  • Envelope membrane
  • Iron metabolism
  • Mössbauer spectrosopy
  • Voltage-dependent transport

ASJC Scopus subject areas

  • Genetics
  • Plant Science

Cite this

Does a voltage-sensitive outer envelope transport mechanism contributes to the chloroplast iron uptake? / Solti, Ádám; Kovács, Krisztina; Müller, Brigitta; Vázquez, Saúl; Hamar, Éva; Pham, Hong Diep; Tóth, Brigitta; Abadía, Javier; Fodor, F.

In: Planta, 19.08.2016, p. 1-11.

Research output: Contribution to journalArticle

Solti, Á, Kovács, K, Müller, B, Vázquez, S, Hamar, É, Pham, HD, Tóth, B, Abadía, J & Fodor, F 2016, 'Does a voltage-sensitive outer envelope transport mechanism contributes to the chloroplast iron uptake?', Planta, pp. 1-11. https://doi.org/10.1007/s00425-016-2586-3
Solti, Ádám ; Kovács, Krisztina ; Müller, Brigitta ; Vázquez, Saúl ; Hamar, Éva ; Pham, Hong Diep ; Tóth, Brigitta ; Abadía, Javier ; Fodor, F. / Does a voltage-sensitive outer envelope transport mechanism contributes to the chloroplast iron uptake?. In: Planta. 2016 ; pp. 1-11.
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AB - Main conclusion: Based on the effects of inorganic salts on chloroplast Fe uptake, the presence of a voltage-dependent step is proposed to play a role in Fe uptake through the outer envelope.Although iron (Fe) plays a crucial role in chloroplast physiology, only few pieces of information are available on the mechanisms of chloroplast Fe acquisition. Here, the effect of inorganic salts on the Fe uptake of intact chloroplasts was tested, assessing Fe and transition metal uptake using bathophenantroline-based spectrophotometric detection and plasma emission-coupled mass spectrometry, respectively. The microenvironment of Fe was studied by Mössbauer spectroscopy. Transition metal cations (Cd2+, Zn2+, and Mn2+) enhanced, whereas oxoanions (NO3−, SO42−, and BO33−) reduced the chloroplast Fe uptake. The effect was insensitive to diuron (DCMU), an inhibitor of chloroplast inner envelope-associated Fe uptake. The inorganic salts affected neither Fe forms in the uptake assay buffer nor those incorporated into the chloroplasts. The significantly lower Zn and Mn uptake compared to that of Fe indicates that different mechanisms/transporters are involved in their acquisition. The enhancing effect of transition metals on chloroplast Fe uptake is likely related to outer envelope-associated processes, since divalent metal cations are known to inhibit Fe2+ transport across the inner envelope. Thus, a voltage-dependent step is proposed to play a role in Fe uptake through the chloroplast outer envelope on the basis of the contrasting effects of transition metal cations and oxoaninons.

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