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Enzymatic C-4 deacetylation of 10-deacetylbaccatin III

Authors :
Ramesh N. Patel
Ronald L. Hanson
William L. Parker
Source :
Biotechnology and Applied Biochemistry. 45:81
Publication Year :
2006
Publisher :
Wiley, 2006.

Abstract

Second-generation paclitaxel analogues that require replacement of the C-4 acetate by other substituents are in development. An enzyme able to specifically remove the C-4 acetate from paclitaxel could simplify preparation of the analogues. Several strains were isolated from soil samples that contain enzyme activities able to 4-deacetylate 10-DAB (10-deacetylbaccatin III). Selection was made using plates containing 10-DAB as the sole carbon source and screening colonies for deacetylation of 10-DAB. Two strains initially isolated were identified as Rhodococcus sp. and deposited with the A.T.C.C. (Manassas, VA, U.S.A.) as strains 202191 and 202192. Whole cells were able to convert 10-DAB into 4,10-DDAB (4-deacetyl-10-deacetylbaccatin III) in 90% yield. The enzyme activity in these strains was not effective with paclitaxel and 10-deacetylpaclitaxel, although 4,10-DDAB was produced from baccatin III. The activity in these strains was associated with an insoluble fraction of cell extracts. Several additional isolates were obtained that were identified as variants of Stenotrophomonas maltophilia, and a soluble C-4 deacetylase was purified approx. 218-fold from one of them. The activity of this enzyme was limited to 10-DAB, and the enzyme was not effective with paclitaxel or baccatin III.

Details

ISSN :
14708744 and 08854513
Volume :
45
Database :
OpenAIRE
Journal :
Biotechnology and Applied Biochemistry
Accession number :
edsair.doi.dedup.....17bd5cb0f8f8d1da05d7cbda46ac8194