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Structural insight into binding site access and ligand recognition by human ABCB1.

Devanshu Kurre1, Phuoc X Dang1,2, Le T M Le1,3

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Human ABCB1 efflux pump structures reveal distinct conformations, offering new insights into drug transport mechanisms and multidrug resistance. These findings are crucial for designing better ABCB1 inhibitors.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Pharmacology

Background:

  • The ATP-binding cassette sub-family B member 1 (ABCB1) protein is a key efflux pump involved in cellular drug handling and the development of multidrug resistance.
  • The precise mechanisms underlying ABCB1's poly-specific substrate recognition and transport remain incompletely understood.

Purpose of the Study:

  • To elucidate the structural mechanisms of human ABCB1 function, including substrate binding and transport.
  • To provide high-resolution structural data for understanding ABCB1's role in drug resistance.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was employed to determine structures of lipid-embedded human ABCB1.
  • Structures were resolved in apo, substrate-bound, inhibitor-bound, and nucleotide-trapped states at 3.4–3.9 Å resolution.
  • Stabilizing antibodies and mutations were avoided to capture native conformations.

Main Results:

  • Distinct conformations were revealed for each functional state of ABCB1.
  • The substrate-binding site is asymmetrically located and initially obstructed by transmembrane helix 4 (TM4).
  • Significant differences in transmembrane helix arrangements and ligand-binding chemistry distinguish substrate and inhibitor binding, with TM4 central to conformational changes.

Conclusions:

  • Structural asymmetry, secondary structure breaks, and lipid interactions are critical for ABCB1 function.
  • These findings provide fundamental insights into ABCB1's transport mechanism.
  • The results have significant implications for the rational design of ABCB1 inhibitors and prediction of substrate-binding profiles.