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Expression and characterization of a recombinant maize CK-2 alpha subunit
B Boldyreff1, F Meggio, G Dobrowolska
1Institut für Humangenetik, Universität des Saarlandes, Homburg, Germany.
Biochimica Et Biophysica Acta
|April 29, 1993
Summary
Recombinant maize CK-2 alpha (rmCK-2 alpha) was purified and characterized. Biochemical and biophysical experiments revealed rmCK-2 alpha differs significantly from CKIIB, suggesting distinct genetic origins or post-translational modifications.
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- CKIIB, a maize CK-2 like enzyme, shares immunological properties with CK-2 alpha.
- Biochemical and biophysical validation is needed to confirm the relationship between CKIIB and maize CK-2 alpha.
Purpose of the Study:
- To produce and purify recombinant maize CK-2 alpha (rmCK-2 alpha) for biochemical and biophysical characterization.
- To compare the properties of rmCK-2 alpha with CKIIB and recombinant human CK-2 alpha (rhCK-2 alpha).
Main Methods:
- Maize CK-2 alpha cDNA was expressed in BL21 (DE3) bacteria.
- Recombinant protein was purified using SDS-PAGE.
- Enzyme activity assays were performed, including calmodulin phosphorylation with and without polylysine and CK-2 beta.
Main Results:
- Purified rmCK-2 alpha has an estimated molecular mass of 36.5 kDa.
- rmCK-2 alpha shares properties with rhCK-2 alpha but differs significantly from CKIIB.
- Key differences include polylysine's effect on calmodulin phosphorylation and the requirement for CK-2 beta for optimal activity.
Conclusions:
- CKIIB and rmCK-2 alpha are likely distinct proteins due to significant biochemical and biophysical differences.
- These differences suggest CKIIB may be encoded by a different gene or undergo extensive post-transcriptional/post-translational modifications.