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Boron stabilizes peroxide mediated changes in the structure of heme proteins.

Abstract：

:Boron is reported in this study to stabilize the structure of heme proteins exposed to peroxides. The oxidized heme protein (15 microM) was treated with H(2)O(2) (10mM) in 1M glycine-NaOH buffer (pH 9.2) at 25 degrees C in absence/presence of boron, and characterized by visible absorption spectroscopy, gel exclusion chromatography, native PAGE, HPLC and DLS. Spectral analysis of exposed heme proteins revealed a decrease in absorbance in the Soret region, which was stabilized by boron. The native PAGE analysis of exposed heme proteins showed high molecular weight products; the band intensity was lesser in presence of boron. Further, elution profile of the exposed heme proteins on Sephadex G-200 column and HPLC revealed more than one peak (aggregate formation) when compared to the respective untreated proteins. DLS, which measures the hydrodynamic radius (R(H)), was used to ascertain whether the peaks correspond to monomer, dimer or aggregate forms. The R(H) of boron pretreated heme proteins was close to R(H) of the respective heme protein. Non-heme protein RNase did not show any change when exposed to peroxide. Taken together, results conclude that boron stabilizes the structure of heme proteins, which might be due to specific sites on heme proteins that can bind to borate ions.

journal_name

Int J Biol Macromol

journal_title

International journal of biological macromolecules

authors

Ali S,Farooqi H,Prasad R,Naime M,Routray I,Yadav S,Ahmad F

doi

10.1016/j.ijbiomac.2010.05.013

subject

Has Abstract

pub_date

2010-08-01 00:00:00

pages

109-15

issue

2

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(10)00179-0

journal_volume

47

pub_type

杂志文章

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