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Related Experiment Videos

Polymorphic cDNAs encode for the methionine-rich storage protein from Manduca sexta

X Y Wang1, D R Frohlich, M A Wells

  • 1Department of Biochemistry, University of Arizona, Tucson 85721, USA.

Insect Molecular Biology
|January 1, 1993
PubMed
Summary

Manduca sexta larvae produce three closely related methionine-rich storage proteins (MMR1, MMR2, MMR3) with minimal genetic differences. These proteins are more evolutionarily related to homologous proteins in Bombyx mori than to other storage protein classes within M. sexta.

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Area of Science:

  • Insect biochemistry
  • Molecular evolution
  • Genomics

Background:

  • Manduca sexta larvae synthesize methionine-rich storage proteins crucial for development.
  • Understanding the genetic basis and evolutionary relationships of these proteins is important for insect biology.

Purpose of the Study:

  • To characterize the cDNA sequences of methionine-rich storage proteins in Manduca sexta.
  • To investigate the evolutionary relationships between Manduca sexta storage proteins and those of Bombyx mori.

Main Methods:

  • cDNA cloning and sequencing
  • Comparative sequence analysis using distance and parsimony methods

Main Results:

  • Identified three highly similar methionine-rich storage proteins (MMR1, MMR2, MMR3) in Manduca sexta.

Related Experiment Videos

  • Sequence analysis revealed minimal nucleotide and amino acid differences among MMR1, MMR2, and MMR3.
  • Homologous storage proteins between Manduca sexta and Bombyx mori showed closer evolutionary relationships than different storage protein classes within Manduca sexta.

    • Conclusions:

    • The Manduca sexta methionine-rich storage proteins evolved recently and are highly conserved.
    • Comparative analysis supports distinct evolutionary trajectories for different storage protein families within a species.