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An Integrated Approach for Microprotein Identification and Sequence Analysis
09:37

An Integrated Approach for Microprotein Identification and Sequence Analysis

Published on: July 12, 2022

Folding factors and partners for the intrinsically disordered protein micro-exon gene 14 (MEG-14)

Jose Luiz S Lopes1, Debora Orcia, Ana Paula U Araujo

  • 1Institute of Structural and Molecular Biology, Birkbeck College, University of London, London, United Kingdom.

Biophysical Journal
|June 11, 2013
PubMed

Insights

The micro-exon gene 14 (MEG-14) from the Schistosoma mansoni parasite is an intrinsically disordered protein. It folds into ordered structures in response to various environmental cues, suggesting multifunctional roles within the host.

Area of Science:

  • Parasitology
  • Protein Biochemistry
  • Structural Biology

Background:

  • Schistosoma mansoni causes a widespread tropical disease.
  • Micro-exon genes (MEGs) encode unique secreted proteins within the Schistosoma genus.
  • MEG-14 is a protein of interest due to its unique sequence and potential role in host-parasite interactions.

Purpose of the Study:

  • To characterize the structural properties of the Schistosoma mansoni MEG-14 protein.
  • To investigate the conditions under which MEG-14 transitions from a disordered to an ordered state.
  • To explore the implications of MEG-14's structural plasticity for its function.

Main Methods:

  • Bioinformatic analysis to predict protein structure.
  • Synchrotron radiation circular dichroism (SRCD) spectroscopy to determine secondary structure.
  • Experiments varying temperature, lipid/detergent presence, solvent environment, and hydration state.

Main Results:

  • Bioinformatics predicted a largely disordered soluble domain for MEG-14.
  • SRCD confirmed MEG-14 is predominantly unfolded in aqueous solution.
  • MEG-14 demonstrated a propensity to fold into ordered structures under diverse conditions, including increased temperature, presence of anionic lipids/detergents, dehydration, and non-aqueous solvents.
  • Folding induced by dehydration was reversible upon rehydration.

Conclusions:

  • MEG-14 is identified as a classic intrinsically disordered protein (IDP).
  • Its structural plasticity suggests adaptability and potential for multiple functions.
  • The folding behavior indicates possible interactions with host cell membranes or other factors, contributing to the parasite's survival and pathogenesis.

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