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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases
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Crystallizing Membrane Proteins for Structure Determination using Lipidic Mesophases

Published on: November 21, 2010

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Memtein: The fundamental unit of membrane-protein structure and function

Michael Overduin1, Mansoore Esmaili1

  • 1Department of Biochemistry, University of Alberta, Edmonton, Alberta T6G 2H7, Canada.

Chemistry and Physics of Lipids
|December 4, 2018
PubMed

Insights

Memteins, complexes of membrane proteins and lipids, are proposed as key cellular units. Native nanodiscs enable studying these vital membrane protein-lipid structures for understanding cellular function.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Cell Biology

Background:

  • Membrane proteins are crucial for cellular functions like signal transduction and trafficking.
  • Understanding membrane protein function requires studying them within their native lipid environment.
  • The concept of 'memteins' as minimal functional units of membrane proteins complexed with lipids is introduced.

Purpose of the Study:

  • To propose the memtein as a fundamental unit of membrane protein function.
  • To highlight the challenges and importance of studying memteins at atomic resolution.
  • To present native nanodiscs as a method for preparing and studying memteins.

Main Methods:

  • Utilizing poly(styrene-co-maleic acid) (SMA) copolymers to form native nanodiscs.
  • Preparing water-soluble nanodiscs containing membrane protein-lipid complexes (memteins).
  • Employing techniques such as cryo-electron microscopy (cEM), X-ray crystallography (XRC), NMR spectroscopy, and mass spectrometry (MS) for structural elucidation.

Main Results:

  • Native nanodiscs allow the preparation of membrane protein-lipid complexes without detergents.
  • Memteins, when studied in nanodiscs, provide a more biologically relevant representation than lipid-free proteins.
  • Structural and interactional details of memteins can be resolved using advanced biophysical methods.

Conclusions:

  • Memteins represent critical biological entities for cellular signaling and transport.
  • Native nanodiscs are effective tools for investigating the structure and function of memteins.
  • Further research into memteins using polymer chemistry and structural biology is essential for advancing membrane biology.
Keywords:
Membrane structureMemteinNative nanodiscSMALPStyrene maleic acidTransmembrane protein

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