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An in vitro set-up to study Pdr5-mediated substrate translocation.

Stefanie L Gala Marti1, Manuel Wagner1,2, Lea-Marie Nentwig1

  • 1Institute of Biochemistry, Heinrich Heine University Düsseldorf, Düsseldorf, Germany.

Protein Science : a Publication of the Protein Society
|September 23, 2024
PubMed
Summary

Researchers successfully reconstituted the Pdr5 ABC transporter in a synthetic membrane, enabling functional studies. This breakthrough allows investigation of its drug resistance mechanisms and nucleotide usage in a controlled environment.

Keywords:
NBD lipidsNTPase activityPdr5protein reconstitutiontransport activity

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Pdr5 is a key ABC transporter in Saccharomyces cerevisiae, crucial for the pleiotropic drug resistance (PDR) network.
  • Its asymmetric nucleotide binding site makes it a model for medically relevant transporters like Candida albicans Cdr1.
  • Previous in vivo and vesicle studies were limited by the inability to isolate and reconstitute active Pdr5 in synthetic membranes.

Purpose of the Study:

  • To achieve functional reconstitution of Pdr5 in a native-like synthetic membrane environment.
  • To investigate the transport activity and nucleotide utilization of reconstituted Pdr5.
  • To characterize the kinetic parameters of Pdr5's NTPase activity.

Main Methods:

  • Functional reconstitution of Pdr5 into proteoliposomes in an inside-out orientation.
  • Assay of NBD lipid translocation across the proteoliposome membrane.
  • Measurement of NTPase activity using various nucleotides (ATP, GTP, CTP, UTP).

Main Results:

  • Reconstituted Pdr5 successfully translocated NBD lipids from the outer to the inner leaflet of proteoliposomes.
  • Pdr5 demonstrated the ability to utilize various nucleotides (GTP, CTP, UTP) in addition to ATP for substrate transport.
  • NTPase activity of reconstituted Pdr5 was estimated, and kinetic parameters for different nucleotides were determined.

Conclusions:

  • The successful functional reconstitution of Pdr5 provides a powerful system for studying its mechanism of action.
  • This reconstituted system allows for detailed analysis of Pdr5's substrate translocation and nucleotide-dependent activity.
  • Findings advance understanding of asymmetric ABC transporters and their role in drug resistance.