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The amino terminus of the human multidrug resistance transporter ABCC1 has a U-shaped folding with a gating function

Qun Chen1, Youyun Yang, Lang Li

  • 1Department of Pharmacology and Toxicology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.

The Journal of Biological Chemistry
|August 18, 2006
PubMed

Insights

The amino terminus of the ABCC1 transporter has a U-shaped structure that likely acts as a gate, regulating anticancer drug transport and potentially overcoming multidrug resistance in cancer chemotherapy.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Multidrug resistance (MDR) is a significant challenge in cancer chemotherapy.
  • Overexpression of ATP-binding cassette (ABC) transporters, like ABCC1, leads to decreased anticancer drug accumulation and increased cell survival.
  • ABCC1 possesses a unique extracellular amino terminus (MSD0) whose function remains largely unexplored.

Purpose of the Study:

  • To investigate the structural folding of the ABCC1 amino terminus.
  • To determine the functional role of this extracellular amino terminus in ABCC1 activity.

Main Methods:

  • Structural analysis of the ABCC1 amino terminus.
  • Functional assays to assess drug transport regulation.

Main Results:

  • The ABCC1 amino terminus adopts a U-shaped conformation.
  • The U-shaped structure has its base oriented towards the cytoplasm, with both ends extending into the extracellular space.
  • This amino terminus appears to function as a regulatory gate for ABCC1 drug transport.

Conclusions:

  • The unique U-shaped extracellular amino terminus of ABCC1 plays a crucial role in regulating its drug transport activity.
  • Understanding this regulatory mechanism may offer new strategies to combat multidrug resistance in cancer treatment.

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