Abstract
The NifL PAS domain from Azotobacter vinelandii is a flavoprotein with FAD as the prosthetic group. Here we describe a novel immobilization procedure for the large-scale preparation of apo NifL PAS domain and its efficient reconstitution with either 2,4a-13C-FAD or 2,4a-13C-FMN. In this procedure, the His-tagged holoprotein is bound to an immobilized metal affinity column and the flavin is released by washing the column with buffer containing 2 M KBr and 2 M urea. The apoprotein is reconstituted on-column with the (artificial) flavin cofactor, and then eluted with buffer containing 250 mM imidazole. Alternatively, the immobilized apoprotein can be released from the column matrix before reconstitution. The His-tag based immobilization method of preparing reconstituted (or apo) NifL PAS domain protein has the advantage that it combines a protein affinity chromatography technique with limited protein loss, resulting in a high protein yield with extremely efficient flavin reconstitution. This on-column reconstitution method can also be used in cases where the apoprotein is unstable. Therefore, it may develop as a universal method for replacement of flavin or other cofactors.
| Original language | English |
|---|---|
| Pages (from-to) | 139-43 |
| Number of pages | 5 |
| Journal | Biochimica et Biophysica Acta (BBA) - General Subjects |
| Volume | 1619 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 20 Jan 2003 |
| Externally published | Yes |
Keywords
- apoproteins/chemistry
- azotobacter vinelandii/genetics
- bacterial proteins/biosynthesis
- chromatography, affinity/methods
- circular dichroism
- escherichia coli/metabolism
- flavin mononucleotide/chemistry
- flavin-adenine dinucleotide/chemistry
- flavoproteins/biosynthesis
- genetic vectors
- nuclear magnetic resonance, biomolecular
- protein structure, tertiary
- recombinant proteins/chemistry
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