COPPER(II) PROTOPORPHYRIN-IX AS A REPORTER GROUP FOR THE HEME ENVIRONMENT IN MYOGLOBIN

被引:35
作者
ALSTON, K [1 ]
STORM, CB [1 ]
机构
[1] HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059
关键词
D O I
10.1021/bi00587a006
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Copper(II) protoporphyrin IX has been introduced into apomyoglobin, and its utility as a reporter group of the heme environment has been examined. The Soret and visible absorption bands and electron spin resonance spectrum show that the Cu(II) is five coordinate, probably through coordination to the F-8 proximal histidine. The resonance Raman spectrum does not indicate any appreciable distortion from the solution conformation of copper(II) protoporphyrin IX dimethyl ester in CS2. The ultraviolet circular dichroism shows no alteration of the helical content of the globin from that of metmyoglobin. The circular dichroism of the porphyrin transitions suggests that the packing of the amino acid side chains around the porphyrin is different than that in the native metmyoglobin. © 1979, American Chemical Society. All rights reserved.
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页码:4292 / 4300
页数:9
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