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Updated: Feb 9, 2026

Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO
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Identification of a noncatalytic domain in AMP deaminase that influences binding to myosin

R Marquetant1, R L Sabina, E W Holmes

  • 1Department of Medicine, Duke University Medical Center, Durham, North Carolina 27710.

Biochemistry
|October 31, 1989
PubMed

Insights

AMP deaminase (AMP-D) enzyme activity is not lost when a portion is removed, but its binding to myosin in muscle cells changes with ATP levels. This suggests a new way AMP-D function is regulated.

Area of Science:

  • Biochemistry
  • Muscle Physiology
  • Enzymology

Background:

  • AMP deaminase (AMP-D) is crucial for skeletal muscle energy metabolism.
  • AMP-D has been observed to bind myosin heavy chain in vitro and localize to the A band of myofibrils.

Purpose of the Study:

  • To investigate the role of the carboxy-terminal domain of AMP-D in its interaction with myosin.
  • To explore the influence of ATP concentration on AMP-D binding to myosin.

Main Methods:

  • Proteolytic removal of 14 kilodaltons from the native 80K AMP-D peptide.
  • Assessing catalytic activity of the modified AMP-D.
  • Evaluating AMP-D binding to myosin in the presence of ATP.
  • Comparing rat skeletal muscle AMP-D sequence with yeast AMP-D.

Main Results:

  • Proteolytic removal of the carboxy-terminal 14 kDa from AMP-D did not abolish its catalytic activity.
  • This deletion significantly altered AMP-D's binding affinity to myosin in the presence of ATP.
  • Sequence analysis revealed a conserved ATP binding site in the carboxy-terminal domain of rat AMP-D.

Conclusions:

  • A mechanism for regulating AMP-D binding to myosin heavy chain via ATP concentration is proposed.
  • The formation of an AMP-D/myosin complex may have a functional role in myocytes.

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