Interaction of D, L-erythro- and D,L-threo-gamma-fluoromethotrexate with human leukemia cell dihydrofolate reductase.
Interaction of D, L-erythro- and D,L-threo-gamma-fluoromethotrexate with human leukemia cell dihydrofolate reductase.
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D,L-赤型和 D,L-苏型-γ-氟甲氨蝶呤与人白血病细胞二氢叶酸还原酶的相互作用。
DOI:
10.1016/0006-2952(89)90532-7
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发表时间:
1989
影响因子:
5.8
通讯作者:
Coward,JK
中科院分区:
文献类型:
--
作者:
McGuire,JJ;Haile,WH;Coward,JK
Gamma-fluoromethotrexate (FMTX) is a poorly glutamylated mimic of the anti-cancer drug methotrexate (MTX) which is useful in studies of the roles of MTX poly-γ-glutamates. A second chiral center occurs at C-4 of the 4-fluoroglutamate used to synthesize FMTX and, as a consequence, FMTX occurs as bothd,l-erythro andd,l-threodiastereomers. The interaction of both diastereomers with intracellular dihydrofolate reductase has been examined in the human leukemia cell line CCRF-CEM, using a centrifugal column technique. Measurements of the rate at which radiolabel was displaced from [3H]MTX-saturated dihydrofolate reductase following suspension of the cells in unlabeled drug indicated that MTX and theerythroisomer of FMTX gave essentially the same rate of displacement; the rate of displacement by thethreoisomer of FMTX was slower, but the interpretation of these data was ambiguous since the rate of transport ofthreo-FMTX may have been limiting. In reciprocal experiments in which dihydrofolate reductase was saturated with [3H]erythro-FMTX, theerythroisomer and MTX again behaved equivalently in terms of displacement. When dihydrofolate reductase was saturated with [3H]threo-FMTX, the radiolabel was clearly displaced at a much faster rate than either other radiolabel regardless of whether the displacing agent was MTX or the isomer. These results indicate a distinct stereospecificity for interaction of inhibitor with dihydrofolate reductase in which thethreoisomer has a faster off-rate. Of the two FMTX diastereomers, theerythroisomer thus most closely mimics the properties of MTX.
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DOI:
10.1016/s0021-9258(18)88843-3
发表时间:
1985-06
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
J. McGuire;J. Coward
通讯作者:
J. McGuire;J. Coward
DOI:
--
发表时间:
1982
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Fry,DW;Yalowich,JC;Goldman,ID
通讯作者:
Goldman,ID
DOI:
--
发表时间:
1987
期刊:
NCI monographs : a publication of the National Cancer Institute
影响因子:
--
作者:
McGuire,JJ;Piper,JR;Coward,JK;Galivan,J
通讯作者:
Galivan,J
DOI:
10.1073/pnas.82.9.2598
发表时间:
1985
影响因子:
11.1
作者:
Galivan,J;Inglese,J;McGuire,JJ;Nimec,Z;Coward,JK
通讯作者:
Coward,JK
影响因子:
11.2
作者:
Cramer,SM;Schornagel,JH;Kalghatgi,KK;Bertino,JR;Horvath,C
通讯作者:
Horvath,C