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Pest sequences in EF-hand calcium-binding proteins

A V Gomes1, J A Barnes

  • 1Department of Biochemistry, Faculty of Medical Sciences, University of the West Indies, St. Augustine.

Biochemistry and Molecular Biology International
|November 1, 1995
PubMed
Summary
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Calcium binding proteins, including the EF-hand family, feature motifs and sequences like PEST and KFERQ. Some EF-hand proteins contain lysine pairs (KK) potentially signaling proteolysis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Science

Background:

  • Calcium binding proteins are crucial in cellular processes.
  • They are broadly classified into EF-hand and Annexin families.
  • The EF-hand family is characterized by a helix-loop-helix motif.

Purpose of the Study:

  • To detail the structural and functional characteristics of EF-hand calcium binding proteins.
  • To explore the significance of specific amino acid sequences within these proteins.

Main Methods:

  • Bioinformatic analysis of protein sequences.
  • Identification of conserved motifs and sequence patterns.

Main Results:

  • EF-hand proteins possess a distinct helix-loop-helix motif.

Related Experiment Videos

  • Subfamilies include those with PEST sequences and non-PEST variants.
  • KFERQ-like sequences, potential lysosomal degradation signals, are present in some.
  • Lysine pairs (KK) are common and may signal proteolysis, while arginine pairs (RR) are rare.

    • Conclusions:

    • EF-hand proteins exhibit diverse sequence features that influence their stability and degradation.
    • Lysine pairs (KK) represent a significant signal for proteolysis in EF-hand proteins.