نتایج جستجو برای: soret

تعداد نتایج: 1031  

Journal: :The Journal of biological chemistry 1989
C E Somers B M Shapiro

Native ovoperoxidase exhibited an optical absorption spectrum with certain similarities to lactoperoxidase, but not horseradish peroxidase, over the pH range 4.5-11.5. Ovoperoxidase had three distinct spectral forms dependent on pH, with transitions at apparent pKa values of 6.6 and 3.0. Complexes of ovoperoxidase with CN-, N3-, F-, or when reduced and ligated to carbon monoxide, CN-, or pyridi...

Journal: :Biochemical Society transactions 1978
J De Rycker B Halliwell

complex reacted rapidly with 02-. in a catalytic manner. The rate constant for O,-* dismutation was determined by competition of the iron porphyrin with Nitro Blue Tetrazolium in a xanthine/xanthine oxidase system at pH 10.1 ; a value of 3 x ~O'M-' .s-' at 20°C was obtained. The iron porphyrin had no effect on xanthine oxidase activity. Under our reaction conditions, at least 14 molecules of Oz...

Journal: :The Journal of biological chemistry 2002
Jennifer D Artz Bryan Schmidt John L McCracken Michael A Marletta

Soluble guanylate cyclase (sGC) is a heterodimeric hemoprotein that catalyzes the conversion of GTP to cGMP. Upon binding NO to its heme cofactor, purified sGC was activated 300-fold. sGC was only activated 67-fold by nitroglycerin (GTN) and Cys; and in the absence of Cys, GTN did not activate sGC. Electronic absorption spectroscopy studies showed that upon NO binding, the Soret of ferrous sGC ...

Journal: :Journal of inorganic biochemistry 2006
Gregory M Raner Jonathan I Thompson Alice Haddy Valary Tangham Nicole Bynum G Ramachandra Reddy David P Ballou John H Dawson

Rapid mixing of substrate-free ferric cytochrome P450(BM3)-F87G with m-chloroperoxybenzoic acid (mCPBA) resulted in the sequential formation of two high-valent intermediates. The first was spectrally similar to compound I species reported previously for P450(CAM) and CYP 119 using mCPBA as an oxidant, and it featured a low intensity Soret absorption band characterized by shoulder at 370nm. This...

Journal: :The Biochemical journal 1989
T J DiFeo A W Addison

The five major components of the monomeric haemoglobin from Glycera dibranchiata were separated and characterized by absorption spectroscopy, isoelectric focusing, azide-binding affinities and nitrosyl autoreduction kinetics. The differences found among the components are discussed in terms of haem-pocket variations. In addition, the Fourier-transform i.r. spectra of pooled monomeric haemoglobi...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1978
L J Noe W G Eisert P M Rentzepis

Excitation of HbCO by a single 6-psec 530-nm pulse results in photodissociation with a first-order constant of 0.89 X 10(11) sec-1. The kinetics of photodissociation, monitored by following absorbance changes in the Soret band at 440 nm, are interpreted as corresponding to predissociation followed by a corssing into a dissociative state. Subsequent recombination of CO with the porphyrin system ...

Journal: :Proceedings of the National Academy of Sciences 1980

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