IRON(III) COORDINATION CHEMISTRY OF LINEAR DIHYDROXYSERINE COMPOUNDS DERIVED FROM ENTEROBACTIN

被引：69

作者：

SCARROW, RC ^{[1
]}

ECKER, DJ ^{[1
]}

NG, C ^{[1
]}

LIU, S ^{[1
]}

RAYMOND, KN ^{[1
]}

机构：

[1] UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720

来源：

INORGANIC CHEMISTRY | 1991年 / 30卷 / 05期

关键词：

D O I：

10.1021/ic00005a007

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The solution thermodynamic stability and iron transport properties of the hydrolysis products of enterobactin are reported. Enterobactin, a tricatechol siderophore, is a cyclic trilactone that undergoes three stepwise hydrolysis reactions to form a linear trimer, then dimer, and finally the monomeric N-(2,3-dihydroxybenzoyl)serine. The protonation and ferric complex formation constants of the linear trimer and linear dimer have been determined. The enthalpies of formation of the linear trimer complex and ferric enterobactin have been measured by calorimetric titrations. The greater stability of the ferric enterobactin complex, compared with tricatechol ligand analogues, is about one-third enthalpic and two-thirds entropic in origin. The DELTA chirality of the ferric enterobactin is also maintained by the linear trimer complex. Assays of the mediation of iron uptake in Escherichia coli RW193 show that both the linear dimer and linear trimer are nearly as effective as enterobactin in mediating iron uptake in this organism.

引用

页码：900 / 906

页数：7

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