| 释义 |
protohæm, -heme Biochem.|ˈprəʊtəʊhiːm|
[a. G. protohäm (H. Fischer et al. 1931, in Zeitschr. f. physiol. Chem. CXCV. 21): see proto- and hæm, heme.]
A ferrous chelate derivative of a protoporphyrin; spec. = hæm, heme a.
1931Chem. Abstr. XXV. 2157 By using a technic which excludes the possibility of oxidation, etioheme, protoheme, mesoheme and meso-ester heme were obtained cryst. from the corresponding porphyrins. 1963R. P. Dales Annelids iv. 88 In haemoglobin the haem is the red protohaem, in chlorocruorin it is the green chlorocruorohaem. 1963C. H. Doering tr. Karlson's Introd. Mod. Biochem. ix. 183 Peroxidases oxidize substrates by employing H2O2 as an oxidizing agent. Depending on their origin, they may contain either a red heme (protoheme or closely related ones) or a green heme. 1970R. W. McGilvery Biochem. xxi. 499 The normal product of porphyrin synthesis is protoheme IX, which is quickly bound by globin peptides and protected from oxidation. |