Structural specificity of inhibition of human folylpolyglutamate synthetase by ornithine-containing folate analogs.
Structural specificity of inhibition of human folylpolyglutamate synthetase by ornithine-containing folate analogs.
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含鸟氨酸叶酸类似物抑制人叶酰聚谷氨酸合成酶的结构特异性。
DOI:
10.1016/0006-2952(88)90076-7
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发表时间:
1988
影响因子:
5.8
通讯作者:
Piper,JR
中科院分区:
文献类型:
--
作者:
McGuire,JJ;Bolanowska,WE;Piper,JR
A series of folate analogs containing ornithine instead of glutamate was synthesized and tested for inhibition of folylpolyglutamate synthetase (FPGS) and other folate-dependent enzymes of human leukemia cell lines. Reduced derivatives of 2-amino-4-oxo-10-methyl-pteroyl-ornithine had dramatically increased inhibitory potency against FPGS compared to the oxidized parent. The aminopterin analog (2,4-diamino-pteroylornithine) was a potent inhibitor of both dihydrofolate reductase and FPGS. It was a much more potent linear competitive inhibitor of human FPGS than the corresponding methotrexate derivative previously described (Ki= 0.15–0.26 and 3μM respectively). A quinazoline folate analog, 2-amino-4-oxo-5,8-dideazapteroyl-ornithine, was a relatively poor inhibitor of isolated dihydrofolate reductase and thymidylate synthase; however, it is the most potent human FPGS inhibitor identified to date (Ki= 100–150 nM). Because of the lack of appreciable interaction with other folatedependent enzymes, structures incorporating the 2-amino-4-oxo-5,8-dideazapteroate nucleus may thus lead to selective inhibition of FPGS. Substitution of ornithine for glutamate caused a profound decrease in cytotoxic potency for these analogs; this was apparently the result of poor transport. Together with earlier studies, these data indicate that the potency of FPGS inhibition by an analog containing ornithine closely parallels the relative substrate activity of its glutamate-containing counterpart. The substitution of ornithine apparently does not perturb the pterin specificity of FPGS. The close parallel between substrate and inhibitor specificity may thus allow the use of currently available structure-activity studies on FPGS to design more potent and more selective inhibitors of FPGS.
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DOI:
10.7326/0003-4819-72-1-153_1
发表时间:
1969
期刊:
--
影响因子:
--
作者:
Raymond L. Blakley
通讯作者:
Raymond L. Blakley
影响因子:
7.3
作者:
Rosowsky,A;Forsch,RA;Freisheim,JH;Moran,RG;Wick,M
通讯作者:
Wick,M
影响因子:
11.2
作者:
McGuire,JJ;Sobrero,AF;Hynes,JB;Bertino,JR
通讯作者:
Bertino,JR
影响因子:
2.9
作者:
George,S;Cichowicz,DJ;Shane,B
通讯作者:
Shane,B
DOI:
--
发表时间:
1986
期刊:
影响因子:
--
作者:
J. McGuire;J. R. Piper
通讯作者:
J. R. Piper