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Structure and multistate function of the transmembrane electron transporter CcdA.

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|September 22, 2015
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This study reveals how transmembrane reductases like CcdA use specific cysteine pairs to shuttle electrons across membranes. Multiple protein conformations facilitate this essential electron transfer process.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Membrane Biology

Background:

  • Transmembrane reductases facilitate electron transfer across biological membranes.
  • The precise mechanism involving cysteine residues remains poorly understood.
  • Archaeal CcdA is a key protein in this electron relay system.

Purpose of the Study:

  • To elucidate the electron transfer mechanism of transmembrane reductases.
  • To determine the structure of archaeal CcdA in a reduced state.
  • To investigate the role of cysteine residues in electron relay.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to determine protein structure.
  • Redox-active NMR samples for structural analysis.
  • In vivo mixed disulfide-trapping experiments.
  • In vitro accessibility assays.

Main Results:

  • Determined the NMR structure of a reduced-state mimic of archaeal CcdA.
  • Identified two cysteine residues separated by 20 Å.
  • Demonstrated that one cysteine is cytoplasm-accessible, while the other is in the protein core.
  • Provided evidence for conformational exchange enabling periplasmic accessibility.
  • Validated functional cysteine positioning and conformational exchange through experiments.

Conclusions:

  • Multiple conformational states of CcdA exist.
  • Conformational exchange is crucial for electron relay across the membrane.
  • A four-state model for electron transfer from cytosolic to periplasmic substrates is proposed.