Evaluation of a UCMK/dCK fusion enzyme for gemcitabine-mediated cytotoxicity.
Evaluation of a UCMK/dCK fusion enzyme for gemcitabine-mediated cytotoxicity.
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评估 UCMK/dCK 融合酶对吉西他滨介导的细胞毒性。
DOI:
10.1016/j.bbrc.2011.11.025
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发表时间:
2011
影响因子:
3.1
通讯作者:
Black,MargaretE
中科院分区:
文献类型:
--
作者:
Johnson,AdamJ;Brown,MelissaN;Black,MargaretE
While gemcitabine (2′-2′-difluoro-2′-deoxycytidine, dFdC) displays wide-ranging antineoplastic activity as a single agent, variable response rates and poor intracellular metabolism often limit its clinical efficacy. In an effort to enhance dFdC cytotoxicity and help normalize response rates, we created a bifunctional fusion enzyme that combines the enzymatic activities of deoxycytidine kinase (dCK) and uridine/cytidine monophosphate kinase (UCMK) in a single polypeptide. Our goal was to evaluate whether the created fusion could induce beneficial, functional changes toward dFdC, expedite dFdC conversion to its active antimetabolites and consequently amplify cell dFdC sensitivity. While kinetic analyses revealed the UCMK/dCK fusion enzyme to possess both native activities, the fusion rendered cells sensitive to the cytotoxic effects of dFdC at the same level as dCK expression alone. These results suggest that increased wild-type UCMK expression does not provide a significant enhancement in dFdC-mediated cytotoxicity and may warrant the implementation of studies aimed at engineering UCMK variants with improved activity toward gemcitabine monophosphate.
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DOI:
10.1016/s0021-9258(19)45547-6
发表时间:
1972
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
N. Nelson;J. Neumann
通讯作者:
J. Neumann
DOI:
10.1042/bj2170667
发表时间:
1984
期刊:
The Biochemical journal
影响因子:
--
作者:
P. Geary;F. Saboowalla;D. Patil;R. Cammack
通讯作者:
R. Cammack
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
L. E. Maelia;S. Koch
通讯作者:
S. Koch
影响因子:
2.9
作者:
A. McDermott;V. Yachandra;R. Guiles;R. Britt;S. Dexheimer;K. Sauer;M. Klein
通讯作者:
M. Klein
影响因子:
4.6
作者:
LINDAHL, PA;TEO, BK;ORMEJOHNSON, WH
通讯作者:
ORMEJOHNSON, WH