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Identification of -type subunits of the Xenopus 20S proteasome and analysis of their changes during the meiotic cell cycle
- Source :
- BMC Biochemistry, Vol 5, Iss 1, p 18 (2004), BMC Biochemistry
- Publication Year :
- 2004
- Publisher :
- BioMed Central, 2004.
-
Abstract
- Background The 26S proteasome is the proteolytic machinery of the ubiquitin-dependent proteolytic system responsible for most of the regulated intracellular protein degradation in eukaryotic cells. Previously, we demonstrated meiotic cell cycle dependent phosphorylation of α4 subunit of the 26S proteasome. In this study, we analyzed the changes in the spotting pattern separated by 2-D gel electrophoresis of α subunits during Xenopus oocyte maturation. Results We identified cDNA for three α-type subunits (α1, α5 and α6) of Xenopus, then prepared antibodies specific for five subunits (α1, α3, α5, α6, and α7). With these antibodies and previously described monoclonal antibodies for subunits α2 and α4, modifications to all α-type subunits of the 26S proteasome during Xenopus meiotic maturation were examined by 2D-PAGE. More than one spot for all subunits except α7 was identified. Immunoblot analysis of 26S proteasomes purified from immature and mature oocytes showed a difference in the blots of α2 and α4, with an additional spot detected in the 26S proteasome from immature oocytes (in G2-phase). Conclusions Six of α-type subunits of the Xenopus 26S proteasome are modified in Xenopus immature oocytes and two subunits (α2 and α4) are modified meiotic cell cycle-dependently.
- Subjects :
- Proteasome Endopeptidase Complex
DNA, Complementary
Xenopus
Cell Cycle
Immunoblotting
Molecular Sequence Data
lcsh:Animal biochemistry
Antibodies, Monoclonal
Cell Differentiation
lcsh:Biochemistry
Meiosis
Protein Subunits
Cytosol
Oocytes
Animals
Humans
Electrophoresis, Gel, Two-Dimensional
lcsh:QD415-436
Amino Acid Sequence
Cloning, Molecular
Protein Processing, Post-Translational
lcsh:QP501-801
Research Article
Subjects
Details
- Language :
- English
- ISSN :
- 14712091
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- BMC Biochemistry
- Accession number :
- edsair.pmid.dedup....8e6e9c12dda55a737696e22776c39da9