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Related Experiment Videos

Conservation of aconitase residues revealed by multiple sequence analysis. Implications for structure/function

D Frishman1, M W Hentze

  • 1European Molecular Biology Laboratory, Heidelberg, Germany.

European Journal of Biochemistry
|July 1, 1996
PubMed
Summary

Iron-sulfur (Fe-S) clusters in aconitases, like iron regulatory protein-1 (IRP-1), act as regulatory switches. Sequence analysis reveals conserved residues, suggesting new structural and functional roles.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Biology

Background:

  • Aconitases, particularly iron regulatory protein-1 (IRP-1), have dual roles: cytoplasmic aconitase and RNA-binding protein.
  • This highlights a novel function of iron-sulfur (Fe-S) clusters as post-translational regulatory switches.

Purpose of the Study:

  • To analyze conserved residues across 28 Fe-S isomerase family members.
  • To integrate sequence data with crystallographic structures of mammalian mitochondrial aconitase.
  • To propose functional and structural roles for newly identified conserved residues.

Main Methods:

  • Sequence alignment of 28 Fe-S isomerase family members.
  • Identification of highly conserved amino acid residues.
  • Integration of sequence analysis with existing crystallographic data.

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Main Results:

  • Highly conserved amino acid residues were identified across the Fe-S isomerase family.
  • Proposed structural and functional significance for previously unrecognized conserved residues.
  • Demonstrated the synergy between protein sequence analysis and crystallographic data.

Conclusions:

  • Detailed protein sequence analysis is valuable when combined with high-resolution crystallographic data.
  • Conserved residues in aconitases may play significant structural and functional roles.
  • Fe-S clusters represent key regulatory elements in protein function.