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Primary structure of a 14 kDa basic structural protein (Lm-76) from the cuticle of the migratory locust, Locusta

J S Andersen1, S O Andersen, P Højrup

  • 1Department of Molecular Biology, Odense University, Denmark.

Insect Biochemistry and Molecular Biology
|April 1, 1993
PubMed

Insights

Researchers determined the amino acid sequence of locust structural protein LM-76. This protein, found in the pharate cuticle, has a unique composition and repeating motifs important for insect exoskeletons.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Insect Molecular Biology

Background:

  • Locust structural proteins are crucial for cuticle development and function.
  • Understanding these proteins aids in comprehending insect exoskeleton formation.

Purpose of the Study:

  • To determine the complete amino acid sequence of the 14 kDa structural protein LM-76.
  • To characterize the structural and compositional features of LM-76.
  • To compare LM-76 with other known locust structural proteins.

Main Methods:

  • Edman degradation of intact protein and peptides.
  • Plasma desorption mass spectrometry.
  • Electrospray mass spectrometry.

Main Results:

  • The complete amino acid sequence of LM-76 was elucidated.
  • LM-76 exhibits high alanine content (32%) and lacks Glu, Cys, Met, Phe, and Trp.
  • A conserved motif (Tyr)-Ala-Ala-Pro-Ala/Val repeats in hydrophobic regions, with a conserved N-terminal sequence.

Conclusions:

  • LM-76 shares characteristics with previously identified pharate locust structural proteins.
  • The identified sequence motifs and amino acid composition provide insights into the protein's role in locust cuticle structure.
  • Conservation of proline-adjacent sequences highlights their importance in exocuticle protein structure.

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