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Related Concept Videos

Secondary Active Transport01:32

Secondary Active Transport

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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme "pump" embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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One example of how cells use the energy contained in electrochemical gradients is demonstrated by glucose transport into cells. The ion vital to this process is sodium (Na+), which is typically present in higher concentrations extracellularly than in the cytosol. Such a concentration difference is due, in part, to the action of an enzyme “pump” embedded in the cellular membrane that actively expels Na+ from a cell. Importantly, as this pump contributes to the high concentration of...
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Primary Active Transport01:29

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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction they would...
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In contrast to passive transport, active transport involves a substance being moved through membranes in a direction against its concentration or electrochemical gradient. There are two types of active transport: primary active transport and secondary active transport. Primary active transport utilizes chemical energy from ATP to drive protein pumps that are embedded in the cell membrane. With energy from ATP, the pumps transport ions against their electrochemical gradients—a direction...
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Related Experiment Video

Updated: May 4, 2026

Introduction to Solid Supported Membrane Based Electrophysiology
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The proton-sucrose symport.

D R Bush1

  • 1Photosynthesis Research Unit, U.S.D.A. Agricultural Research Service, University of Illinois, 190 PABL, 1201 W. Gregory Dr., 61801, Urbana, IL, USA.

Photosynthesis Research
|January 11, 2014
PubMed
Summary
This summary is machine-generated.

Plants rely on assimilate partitioning for growth, with proton-sucrose symport crucial for transporting sugars. This review details recent advances in understanding this vital sucrose transport system.

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Area of Science:

  • Plant Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Heterotrophic plant tissues require imported carbon and nitrogen for growth.
  • Assimilate partitioning involves reductive assimilation in leaves and transport of sucrose and amino acids to heterotrophic cells.
  • Proton-sucrose symport is a key mechanism in this pathway for many plant species.

Purpose of the Study:

  • To review recent advancements in the understanding of proton-sucrose symport.
  • To elucidate the transport properties and bioenergetics of this sucrose transporter.

Main Methods:

  • This review synthesizes findings from various studies on proton-sucrose symport.
  • Focuses on research detailing transport mechanisms and energy coupling.

Main Results:

  • Proton-sucrose symport actively couples sucrose translocation across the plasma membrane to the proton motive force.
  • This system is driven by the H(+)-pumping ATPase.
  • It is currently the only known mechanism explaining sucrose accumulation in plant vascular tissue.

Conclusions:

  • Proton-sucrose symport is essential for plant growth and development by facilitating nutrient distribution.
  • Further research into its transport properties and bioenergetics is crucial for a comprehensive understanding of plant metabolism.