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Chloroplasts are triple membrane structures with an outer membrane, an inner membrane, and a thylakoid membrane, each containing distinct metabolite transporters, membrane translocons, and enzymes. Appropriate sorting and translocating these proteins to their correct membrane systems is essential for chloroplast function.
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Studying Protein Import into Chloroplasts Using Protoplasts
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Evidence for amino-acid: proton cotransport in Ricinus cotyledons.

S P Robinson1, H Beevers

  • 1Biology Department, University of California, 95064, Santa Cruz, CA, USA.

Planta
|December 5, 2013
PubMed
Summary
This summary is machine-generated.

Castor bean cotyledons absorb amino acids via proton cotransport, a process vital for seedling growth. This transport mechanism is energy-dependent and involves specific carriers for amino acids and sucrose.

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Area of Science:

  • Plant Physiology
  • Biochemistry
  • Molecular Biology

Background:

  • During castor bean germination, proteins are hydrolyzed, and amino acids are transferred to cotyledons for seedling development.
  • Castor bean cotyledons actively absorb amino acids, even after removal of the endosperm and hypocotyl.

Purpose of the Study:

  • To investigate the mechanism of amino acid and sucrose transport in castor bean cotyledons.
  • To determine the role of proton cotransport in nutrient uptake.

Main Methods:

  • Measurement of amino acid uptake rates in castor bean cotyledons.
  • Analysis of pH changes in the external medium induced by L-glutamine and sucrose.
  • Use of respiration inhibitors and uncouplers to assess energy dependence.

Main Results:

  • L-glutamine uptake was inhibited by high KCl concentrations, suggesting a role for membrane potential.
  • L-glutamine and other amino acids induced a proton uptake, proportional to their transport rate.
  • Sucrose also induced proton uptake, indicating a shared proton cotransport system with separate carriers for amino acids and sucrose.

Conclusions:

  • Amino acid and sucrose transport in castor bean cotyledons occur via proton cotransport.
  • The transport systems for amino acids and sucrose involve distinct carriers within the same membrane system.
  • This mechanism is crucial for nutrient translocation during early seedling development.