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Protein domains are small structurally independent units that are part of a single amino acid chain.  Although these domains are often structurally independent, they may rely on synergistic effects to perform their functions as part of a larger protein. Protein domains may be conserved within the same organism, as well as across different organisms.
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Interface interactions between βγ-crystallin domain and Ig-like domain render Ca

Shanti Swaroop Srivastava1, Rajeev Raman1, Uday Kiran1

  • 1CSIR - Centre for Cellular and Molecular Biology (CCMB), Hyderabad, 500 007, India.

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Microbial proteins with paired βγ-crystallin and Ig-like domains regulate calcium (Ca2+) binding through interdomain interactions. Mutations disrupting these interfaces enable Ca2+ binding, revealing novel regulatory mechanisms.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Proteins featuring paired βγ-crystallin and Ig-like domains are found in microbes like bacteria, slime molds, and fungi.
  • Examples include Ca2+-dependent cell adhesion molecule-1 (DdCAD-1) and abundant perithecial protein (APP).

Purpose of the Study:

  • To elucidate the Ca2+ binding mechanism and regulation in microbial proteins containing βγ-crystallin and Ig-like domains.
  • To characterize the structural basis for Ca2+ binding or non-binding in APP and its homolog DdCAD-1.

Main Methods:

  • X-ray crystallography was used to determine the structures of APP and Ca2+-bound APP-N-terminal domain (APP-NTD).
  • Site-directed mutagenesis was employed to investigate the role of specific interface interactions in Ca2+ binding regulation.
  • Biochemical assays were performed to assess Ca2+ binding affinities.

Main Results:

  • A generalized theme for identifying Ca2+-binding sites within this protein class was established.
  • APP-NTD binds Ca2+ with micromolar affinity, similar to DdCAD-1, but full-length APP does not bind Ca2+.
  • Crystal structures revealed that interdomain interface interactions in APP inactivate its Ca2+-binding site, while mutations or domain separation restore Ca2+ binding capability.

Conclusions:

  • Heterodomain association offers a novel mechanism for regulating Ca2+ binding in proteins like APP.
  • The interdomain interface is adapted for distinct functional roles in APP and DdCAD-1, highlighting functional divergence within this protein family.