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
中科院分区:
文献类型:
--
作者:
Cocco,L;Groff,JP;TempleJr,C;Montgomery,JA;London,RE;Matwiyoff,NA;Blakley,RL
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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影响因子:
5.6
作者:
C. Browne;I. D. Campbell;P. Kiener;D. Phillips;S. G. Waley;Ian A. Wilson
通讯作者:
Ian A. Wilson
影响因子:
2.4
作者:
J. Montgomery;J. R. Piper;R. D. Elliott;E. Roberts;C. Temple;Y. Shealy
通讯作者:
Y. Shealy
影响因子:
5.2
作者:
J. Montgomery;R. D. Elliott;Suzanne L. Straigh;C. Temple
通讯作者:
C. Temple
影响因子:
2.9
作者:
J. Lyon;P. D. Ellis;R. Dunlap
通讯作者:
R. Dunlap
DOI:
10.1002/cber.19731061218
发表时间:
1974
期刊:
Chemische Berichte
影响因子:
--
作者:
Stefan Tobias;H. Günther;W. Pfleiderer
通讯作者:
W. Pfleiderer