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Mosquito vitellogenin subunits originate from a common precursor.
1Department of Entomology, Michigan State University, East Lansing 48824.
Biochemical and Biophysical Research Communications
|August 30, 1988
Summary
Mosquito vitellogenin (VG) subunits originate from a common 220 kDa precursor. This precursor undergoes co-translational modification, increasing its size to 235 kDa with microsomal membranes.
Area of Science:
- Molecular Biology
- Insect Biochemistry
- Reproductive Biology
Background:
- Vitellogenin (VG) is a major yolk protein precursor in oviparous animals.
- Mosquito VG is synthesized as a large precursor that is processed into subunits.
Purpose of the Study:
- To investigate the origin and processing of mosquito vitellogenin (VG).
- To identify the precursor polypeptide for mosquito VG subunits.
Main Methods:
- Cell-free translation system
- Immunoprecipitation analysis using monoclonal antibodies
- Peptide mapping
Main Results:
- A 220 kDa polypeptide was identified as the specific translation product of mRNA from vitellogenic mosquitoes.
- This 220 kDa precursor was recognized by antibodies against both large and small VG subunits.
- Peptide mapping confirmed homology between the 220 kDa precursor and both VG subunits.
- The precursor's molecular size increased to 235 kDa in the presence of microsomal membranes, indicating co-translational modification.
Conclusions:
- The 200 kDa and 65 kDa subunits of mosquito VG are derived from a common 220 kDa precursor.
- The 220 kDa precursor is synthesized specifically in vitellogenic mosquitoes.
- Initial co-translational modification of the VG precursor occurs with microsomal membranes.