Journal of the Chemical Society, Dalton Transactions p. 2945 - 2954 (1991)
Update date:2022-08-30
Topics:
Casella, Luigi
Gullotti, Michele
Gioia, Luca De
Monzani, Enrico
Chillemi, Francesco
Deuterohaemin <(3,7,12,17-tetramethylporphyrin-2,18-dipropionato)iron(III)> has been covalently linked to the undecapeptide Ala-Phe-Ser-Phe-Glu-Ala-Gln-Gly-Gly-Leu-Ala at one of the propionic acid side chains.The binding equilibria between the resulting deuterohaemin-undecapeptide complex and imidazole occur in two steps; the first molecule of the ligand binds with high affinity (K1 = 1500 dm3 mol-1), while for the second molecule the affinity is markedly lower (K2 = 220 dm3 mol-1), indicating that folding of the peptide chain in the monoimidazole adduct severely limits the accessibility of the sixth iron co-ordination position.The complex exhibits both catalase and peroxidase activity towards reducing substrates in the presence of hydrogen peroxide.In catalytic sulphoxidations of a series of para-substituted thioanisoles, p-XC6H4SMe, by hydrogen peroxide a good correlation has been found between the relative rates and the Hammett ?p values, indicating that direct oxygen transfer from the active oxoiron species to the sulphide is probably operative.The kinetics of the catalytic oxidation of tyrosine by hydrogen peroxide in the presence of the complex, producing the oxidative coupling dimer o,o'-dityrosine, was also studied.It is consistent with a mechanism involving the initial binding of the phenolic substrate to the active catalyst to form an intermediate complex, and its subsequent breakdown in the rate-determining step of the catalytic cycle.The results obtained in the biomimetic oxidations are compared with those of the corresponding peroxidase-catalysed reactions.
View MoreSHAANXI FUJIE PHARMACEUTICAL CO.,LTD
website:http://www.fujiepharm.com
Contact:+86-29-63650906
Address:Yuanqu Yi Road, Qinghe Food Industrial Park, Sanyuan County, Shaanxi Province, China
Refine Chemicals Science & Technology Technology Developing Co., Ltd.
Contact:+86-22-87899130
Address:No.12,west keyan road,Tianjin City
Contact:+86-310-7092106
Address:Quzhou Modern & New Industrial Park, Handan, Hebei 057250, China
Nantong Zandery Biotechnology Co.,Ltd
website:http://www.pyzdr.com
Contact:0086-0513-87582998
Address: No.168 Yilian Plaza Huizheng East Road Rugao Jiangsu China.
Zouping Mingxing Chemical Co.,Ltd.
website:http://www.zoutong.com.cn
Contact:86-543-2240068 2240067
Address:428 Daixi Third Road Zouping County Shandong Province China
Doi:10.1177/1469066718820434
(2019)Doi:10.1080/00304940409355396
(2004)Doi:10.1016/j.bmc.2017.03.052
(2017)Doi:10.1039/C29690000580
(1969)Doi:10.1016/j.tetlet.2004.08.149
(2004)Doi:10.1055/s-0033-1338798
(2013)
