Carbon-13 nuclear magnetic resonance study of protonation of methotrexate and aminopterin bound to dihydrofolate reductase.

Carbon-13 nuclear magnetic resonance study of protonation of methotrexate and aminopterin bound to dihydrofolate reductase.
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甲氨蝶呤和氨基蝶呤与二氢叶酸还原酶结合的质子化的碳 13 核磁共振研究。

DOI:
10.1021/bi00517a005
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发表时间:
1981
期刊:
影响因子:
2.9
通讯作者:
Blakley,RL
Blakley,RL
中科院分区:
生物学3区
文献类型:
--
作者:
Cocco,L;Groff,JP;TempleJr,C;Montgomery,JA;London,RE;Matwiyoff,NA;Blakley,RL

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Lennie Coceo, John P. Groff, Carroll Temple, Jr., John A. Montgomery, Robert E. London, NA Matwiyoff, and R. L. Blakley* abstract: Methotrexate, aminopterin, and folate have been synthesized with 90% enrichment of C-2 with 13C. 13C nuclear magnetic resonance has been used to examine the state of protonation of the pteridine ring of these compounds under various conditions and gives much more clear-cut results than most other methods. For the free compounds the following pK values were obtained: methotrexate, 5.73±0.02 (Nl); aminopterin, 5.70±0.03 (Nl); folic acid, 2.40 (Nl) and 8.25±0.05 (N-3, 0-4 amide group). The state of protonation of these compounds when complexed todihydrofolate reductase (isoenzyme 2 from Streptococcus faecium) was also studied over the pH range 6-10. The resonance from bound methotrexate showed a constant chemical shift over the whole
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