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Related Experiment Videos

G-actin structure revealed by chymotryptic digestion.

K Konno1

  • 1Cardiovascular Research Institute, University of California, San Francisco, CA 94143.

Journal of Biochemistry
|February 1, 1988
PubMed
Summary
This summary is machine-generated.

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Chymotryptic digestion of G-actin with calcium yields two fragments: a 33 kDa core and a 10 kDa N-terminal fragment. This calcium-sensitive complex retains nucleotide binding ability and its calcium binding site.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Chemistry

Background:

  • G-actin undergoes specific proteolytic cleavage in the presence of calcium ions.
  • Understanding G-actin's structural dynamics is crucial for cellular processes.

Purpose of the Study:

  • To investigate the calcium-dependent structural changes in G-actin upon chymotryptic digestion.
  • To characterize the resulting protein fragments and their interactions.

Main Methods:

  • Chymotryptic digestion of G-actin
  • Sephacryl S-200 gel filtration
  • Fluorescent labeling with 5-iodoacetamide fluorescein

Main Results:

  • Chymotryptic digestion in 10(-7.5) M calcium yields a 33 kDa C-terminal core and a 10 kDa N-terminal fragment.

Related Experiment Videos

  • The 10 kDa fragment remains bound to the 33 kDa core in a calcium-sensitive manner.
  • Cys-10 is reactive in the complex with calcium, while Cys-257 becomes reactive upon calcium removal, indicating the calcium binding site is retained.
  • The complex demonstrated nucleotide binding ability.

    • Conclusions:

    • G-actin forms a calcium-sensitive complex with its N-terminal fragment (10 kDa) and C-terminal core (33 kDa).
    • This complex retains its calcium binding site and nucleotide binding capability.
    • The structural integrity and calcium sensitivity are key features of this G-actin complex.