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An Analysis of MIF Structural Features that Control Functional Activation of CD74

Georgios Pantouris1, Mansoor Ali Syed2, Chengpeng Fan1

  • 1Department of Pharmacology, Yale School of Medicine, New Haven, CT 06510, USA.

Chemistry & Biology
|September 15, 2015
PubMed

Insights

Targeting macrophage migration inhibitory factor (MIF) and its receptor CD74 is key for therapeutics. This study reveals how MIF

Area of Science:

  • Immunology
  • Biochemistry
  • Structural Biology

Background:

  • Macrophage migration inhibitory factor (MIF) and its receptor CD74 are key targets for therapeutic development.
  • The catalytic site of MIF and the activation mechanism of CD74 are not well understood.
  • The instability of CD74 hinders structural studies of MIF-CD74 interactions.

Purpose of the Study:

  • To elucidate the mechanistic details of CD74 activation by MIF surface residues.
  • To identify structural parameters of inhibitors that reduce CD74 biological activation.
  • To understand how N-terminal MIF mutations impact CD74 activation.

Main Methods:

  • Utilized a novel approach to study MIF-CD74 interactions.
  • Investigated the role of MIF surface residues in CD74 activation.
  • Analyzed N-terminal MIF mutants and their effect on CD74 activation.

Main Results:

  • Elucidated mechanistic details controlling CD74 activation by MIF surface residues.
  • Identified structural features of inhibitors that decrease CD74 biological activation.
  • Demonstrated that N-terminal MIF mutations affect surface residues, reducing CD74 activation.

Conclusions:

  • MIF surface residues play a critical role in CD74 activation.
  • Inhibitor design can be guided by identified structural parameters to reduce CD74 activation.
  • N-terminal mutations within MIF's catalytic site can allosterically modulate CD74 activation through surface residue interactions.

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