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Related Experiment Videos

Ionic requirements for amino acid transport.

I Zelikovic1, R W Chesney

  • 1Department of Pediatrics, University of Tennessee, College of Medicine, Memphis.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|October 1, 1989
PubMed
Summary
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The proximal tubule efficiently reabsorbs amino acids like taurine via sodium-amino acid cotransport. This process involves a 2 Na+:1 Cl-:1 taurine complex, energized by the sodium gradient, facilitating amino acid uptake into renal cells.

Area of Science:

  • Nephrology
  • Renal Physiology
  • Molecular Transport

Background:

  • Proximal tubule amino acid reabsorption is highly efficient.
  • This process is mediated by sodium-amino acid cotransport (symport).
  • Sodium-Potassium-ATPase maintains the sodium gradient essential for transport.

Purpose of the Study:

  • Investigate anionic requirements for Na+-taurine symport.
  • Determine voltage- and pH-dependence of Na+-taurine symport.
  • Elucidate the stoichiometry of the transport complex.

Main Methods:

  • Utilized rat proximal tubule brush border membrane vesicles.
  • Assessed taurine uptake under varying anionic conditions and ionophores.
  • Employed Hill equation analysis for kinetic studies.

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Main Results:

  • Maximal taurine uptake occurred with chloride (Cl-) or bromide (Br-) as anions.
  • Transport stoichiometry determined as 2 Na+:1 Cl-:1 taurine.
  • Uptake favored by outwardly directed potassium (K+) gradient with valinomycin.

Conclusions:

  • The Na+-taurine cotransporter operates via a positively charged quaternary complex.
  • This mechanism efficiently energizes both chloride and amino acid movement via the sodium gradient.
  • The positively charged complex facilitates entry into the negatively charged renal cell interior.