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Is myelin basic protein crystallizable?

J Sedzik1, D A Kirschner

  • 1Division of Neurology Research, Children's Hospital, Boston, Massachusetts.

Neurochemical Research
|February 1, 1992
PubMed
Summary
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Researchers attempted to crystallize the 18.5 kDa isoform of Myelin Basic Protein (MBP), a key component in myelin. Despite extensive efforts and 4600 conditions, crystallization failed due to the protein's inherent structural flexibility.

Area of Science:

  • Neuroscience
  • Structural Biology
  • Biochemistry

Background:

  • Myelin Basic Protein (MBP) is crucial for myelin stability in the central and peripheral nervous systems.
  • MBP is implicated in demyelinating diseases like multiple sclerosis.
  • The three-dimensional structure of MBP remains undetermined despite its abundance and known function.

Purpose of the Study:

  • To determine the crystal structure of the major 18.5 kDa isoform of Myelin Basic Protein (MBP).
  • To investigate the reasons behind the failure to crystallize MBP.

Main Methods:

  • Extensive crystallization trials were performed on MBP of varying purity.
  • Conventional and factorial search strategies were employed to identify suitable crystallization conditions.
  • Data from previously recalcitrant proteins were analyzed and applied.

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Main Results:

  • Over 4600 different crystallization conditions were tested.
  • Crystallization of the 18.5 kDa MBP isoform was unsuccessful.
  • MBP was observed to adopt a random coil conformation in solution, indicating structural heterogeneity.

Conclusions:

  • The inherent flexibility and random coil nature of MBP hinder the homogeneity required for protein crystallization.
  • 18.5 kDa MBP and potentially its isoforms may remain difficult to crystallize without suppressing their conformational flexibility.