Abstract:
:Procedures are described for the preparation of highly purified thymidylate synthases from Escherichia coli and Bacillus subtilis. The yields in each case are quite high with about 350 mg of pure protein obtained from 1 liter of cells. Basically all that is required to obtain pure enzyme is an induction step from a high-expression vector, followed by a DE-52 column elution. Both enzymes appeared to be fairly stable in that incubation at 43 degrees C for 10 min resulted in the loss of 50% of the E. coli thymidylate synthase activity, while 50 degrees C for 10 min was required to obtain the same effect with the B. subtilis enzyme. In the presence of the substrate, dUMP, each protein was stabilized further by 6 to 7 degrees C, which was increased to 9 to 10 degrees C on addition of dihydrofolate. It was shown also that the E. coli thymidylate synthase could be maintained at 4 degrees C for at least 4 months with little or no loss in activity provided that mercaptoethanol was not present. The presence of the latter led to a progressive loss in activity until little activity could be detected after 18 weeks, which was due, in part, to the formation of a disulfide bond with the active site cysteine. Addition of dithiothreitol restored the enzyme activity to its original state.
journal_name
Protein Expr Purifjournal_title
Protein expression and purificationauthors
Changchien LM,Garibian A,Frasca V,Lobo A,Maley GF,Maley Fdoi
10.1006/prep.2000.1245keywords:
subject
Has Abstractpub_date
2000-07-01 00:00:00pages
265-70issue
2eissn
1046-5928issn
1096-0279pii
S1046-5928(00)91245-2journal_volume
19pub_type
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