METAL CHELATES OF SOME SULFUR-CONTAINING AMINO ACIDS

METAL CHELATES OF SOME SULFUR-CONTAINING AMINO ACIDS
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DOI:
10.1021/bi00894a001
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发表时间:
1964-01-01
期刊:
影响因子:
2.9
通讯作者:
MARTELL, AE
MARTELL, AE
中科院分区:
生物学3区
文献类型:
--
作者:
LENZ, GR;MARTELL, AE

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DL-蛋氨酸、S-甲基-L-半胱氨酸、DL-乙醇的酸解离常数。L-半胱氨酸和DL-青霉胺,以及与Ag(I)、Ca(II)、Cd(II)、Co(II)、Cu(II)、Hg(n)、Mg(II)、Mn(n)、Ni(n)、Pb(n)、Sr(II)和Zn(n)的螯合物稳定常数报告为25[degree]和0.10 [image]离子强度。L-半胱氨酸和DL-青霉胺对Cd(n)、Hg(n)和Pb(II)是三齿的,而对除Ag(I)以外的其它金属是二齿的。所有的配体都是单齿的Ag(I);青霉胺只形成质子化的Ag(I)络合物,半胱氨酸-Ag(I)络合物沉淀。DL-蛋氨酸、S-甲基-L-半胱氨酸和DL-乙醇对所有其他金属都是双齿的。没有证据表明任何配体与碱土金属形成螯合物。
Acid-dissociation constants of DL-methionine, S-methyl-L-cysteine, DL-ethionine. L-cysteine, and DL-penicillamine, and the chelate-stability constants with Ag(I), Ca(II), Cd(II), Co(II), Cu(II), Hg(n), Mg(II), Mn(n), Ni(n), Pb(n), Sr(II), and Zn(n) are reported for 25[degree] and 0.10 [image] ionic strength. L-Cysteine and DL-penlcillamine are terdentate with respect to Cd(n), Hg(n), and Pb(II), and bidentate with the other metals, excepting Ag(I). All ligands are monodentate toward Ag(I); penicillamine forms only a protonated Ag(I) complex, and the cysteinate-Ag(I) complex precipitates. DL-Methionine, S-methyl-L-cysteine, and DL-ethionine are bidentate toward all other metals. There was no evidence of chelate formation of any of the ligands with the alkaline earths.