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The renal type H+/peptide symporter PEPT2: structure-affinity relationships
A Biegel1, I Knütter, B Hartrodt
1Institute of Biochemistry, Department of Biochemistry/Biotechnology, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
Amino Acids
|July 27, 2006
Summary
The peptide transporter PEPT2, found in organs like the kidney and lung, facilitates the uptake of peptide-like drugs. Understanding PEPT2
Area of Science:
- Pharmacology
- Molecular Biology
- Biochemistry
Background:
- The H(+)/peptide cotransporter PEPT2 is expressed in key organs including the kidney, lung, brain, mammary gland, and eye.
- PEPT2 transports dipeptides, tripeptides, and peptidomimetics like beta-lactam antibiotics.
- Its presence in the bronchial epithelium suggests potential for aerosol drug delivery.
Purpose of the Study:
- To compile and compare substrate affinity data for PEPT2 across various mammalian tissues and expression systems.
- To analyze the structural basis for substrate recognition by PEPT2 in comparison to PEPT1.
- To highlight the role of PEPT2 in the disposition and half-life of peptide-like drugs.
Main Methods:
- Literature review compiling affinity constants for 352 compounds.
- Comparative analysis of PEPT2 and PEPT1 substrate specificity.
- Data collation from diverse mammalian tissues and in vitro expression systems.
Main Results:
- A comprehensive dataset of 352 compounds and their affinity constants for PEPT2 was assembled.
- Comparisons were made between PEPT2 and PEPT1 substrate affinities where data overlapped.
- Tissue and system-specific variations in PEPT2 substrate affinity were noted.
Conclusions:
- PEPT2 plays a crucial role in the pharmacokinetics of peptide-like drugs, particularly in the kidney and brain.
- Aerosolized peptide-drug delivery via PEPT2 presents a promising therapeutic avenue for pulmonary and systemic diseases.
- Detailed substrate affinity data provides a foundation for designing novel peptide-based therapeutics targeting PEPT2.