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Related Concept Videos

Protein Organization01:13

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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A Protocol for Computer-Based Protein Structure and Function Prediction
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Published on: November 3, 2011

Phasing statistics for alpha helical membrane protein structures.

Joanne L Parker1, Simon Newstead

  • 1Department of Biochemistry, University of Oxford, Oxford, UK.

Protein Science : a Publication of the Protein Society
|August 22, 2013
PubMed
Summary
This summary is machine-generated.

Molecular replacement is the leading method for phasing alpha helical membrane proteins, though experimental phasing remains key for transporters. Organic mercury salts are most effective for experimental phasing, with increased use of seleno-L-methionine and SAD/MAD techniques.

Keywords:
alpha helical membrane proteinsphasingprotein crystallography

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Area of Science:

  • Structural Biology
  • Biophysics
  • Biochemistry

Background:

  • Alpha helical membrane proteins are crucial in cellular functions but challenging to crystallize and solve.
  • Accurate phase determination is essential for determining the 3D structure of these proteins.

Purpose of the Study:

  • To review current trends in phasing methods for alpha helical membrane proteins.
  • To analyze the efficacy of heavy atom salts in experimental phasing.
  • To guide the selection of phasing strategies for membrane protein structure determination.

Main Methods:

  • Analysis of recent literature on phasing techniques for alpha helical membrane proteins.
  • Evaluation of heavy atom salts commonly used in experimental phasing.
  • Assessment of the success rates of molecular replacement versus experimental phasing methods.

Main Results:

  • Molecular replacement is the most successful phasing method overall for alpha helical membrane proteins.
  • Experimental phasing remains superior for the transporter protein family.
  • Organic mercury salts are the most effective heavy atom reagents for experimental phasing.
  • Increased utilization of seleno-L-methionine incorporation and single-wavelength anomalous diffraction (SAD) and multi-wavelength anomalous diffraction (MAD) techniques.

Conclusions:

  • Molecular replacement is the preferred method for most alpha helical membrane proteins.
  • Experimental phasing, particularly with organic mercury salts, is vital for specific protein families like transporters.
  • Advancements in techniques like SAD/MAD and incorporation of seleno-L-methionine offer improved phasing capabilities.