Spectral studies of magnesium porphyrin--apomyoglobin and apohemoglobin complexes.
J Inorg Biochem
; 19(3): 189-202, 1983 Nov.
Article
em En
| MEDLINE
| ID: mdl-6644293
ABSTRACT
Complexes of magnesium protoporphyrin and magnesium mesoporphyrin with apomyoglobin and apohemoglobin have been prepared and studied by electronic, circular dichroism, and optical rotatory dispersion spectroscopy. The myoglobin complexes show prominent splittings and red shifts of the visible absorption bands, with respect to those for the hemoglobin analogs. Comparisons are made with other heme protein systems that display similar spectral features. Different reasons for the observations are considered, including multiple conformer formation, polarity effects of the protein environment, and the formation of six-coordinate magnesium species through H2O coordination for the Mb complexes (the latter explanation being favored).
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Apoproteínas
/
Porfirinas
/
Protoporfirinas
/
Hemoglobinas
/
Mesoporfirinas
/
Mioglobina
Limite:
Animals
Idioma:
En
Revista:
J Inorg Biochem
Ano de publicação:
1983
Tipo de documento:
Article