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Sequence-structure analysis of FAD-containing proteins.

O Dym1, D Eisenberg

  • 1University of California, Los Angeles-DOE Laboratory of Structural Biology and Molecular Medicine, University of California, Los Angeles, Los Angeles, California 90095-1570, USA.

Protein Science : a Publication of the Protein Society
|August 22, 2001
PubMed
Summary

Researchers identified four distinct flavin adenine dinucleotide (FAD)-binding protein folds, each with unique sequence motifs. Pyrophosphate binding is key for molecular recognition in these FAD-binding proteins.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Genomics

Background:

  • Flavin adenine dinucleotide (FAD) is a crucial cofactor in numerous biological processes.
  • Understanding FAD-binding protein structures is essential for genomic-scale analysis and drug discovery.

Purpose of the Study:

  • To analyze structure-sequence relationships in 32 FAD-binding protein families.
  • To identify conserved sequence motifs and cofactor properties within FAD-binding protein folds.
  • To define new FAD-binding protein families and folds.

Main Methods:

  • Comparative analysis of 32 FAD-binding protein families.
  • Identification and characterization of conserved sequence motifs.
  • Analysis of FAD cofactor properties, including directionality, conformation, and orientation.

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Main Results:

  • Four distinct FAD-family folds were identified, with three previously defined (GR, FR, PCMH) and one newly defined (PO).
  • Conserved sequence motifs unique to each FAD fold were characterized, with new motifs reported for PO, GR, and PCMH families.
  • Cofactor properties like directionality, conformation, and orientation showed both conserved and variable patterns across families, correlating with FAD-family fold and binding pocket shape.

Conclusions:

  • No single pharmacophore exists for FAD binding, highlighting the diversity of FAD-binding proteins.
  • The pyrophosphate moiety consistently binds to the most conserved sequence motif, indicating its critical role in molecular recognition.
  • Conserved sequence motifs can serve as identifiers for proteins that bind phosphate-containing ligands, aiding in functional prediction.