The preparation and characterization of a new microperoxidase obtained from proteinase K-treated cytochrome (C552) from Marinobacter hydrocarbonoclasticus (previously known as Pseudomonas nautica) are presented. This microperoxidase (MMP-5) has novel structural properties relative to previously reported microperoxidases, as the two intervening amino acid (X) residues within the consensual CXXCH c-type heme binding motif are missing, yielding a heme-pentapeptide with increased solubility in aqueous solvents and a 1-2 order of magnitude higher stability of the monomeric state relative to canonical microperoxidases. The electronic spectra in the near-UV and visible regions have been studied as a function of MMP-5 concentration and pH. The spectroscopic properties of MMP-5 are typical of microperoxidases with high-spin hexa- or pentacoordinate heme species dominant in the 1-8 pH range and low-spin states prevailing at higher pH values. In the presence of hydrogen peroxide, MMP-5 displays peroxidatic activities towards several compounds. (c) 2005 Elsevier B.V. All rights reserved.
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|Titolo:||A new microperoxidase from Marinobacter hydrocarbonoclasticus|
|Data di pubblicazione:||2005|
|Appartiene alla tipologia:||01a Articolo in rivista|