TY - JOUR
T1 - Studies on compound I formation of the lignin peroxidase from Phanerochaete chrysosporium.
AU - Andrawis, A.
AU - Johnson, K. A.
AU - Tien, M.
N1 - Copyright:
This record is sourced from MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
PY - 1988/1/25
Y1 - 1988/1/25
N2 - Ligninase, isolated from the wood-destroying fungus Phanerochaete chrysosporium, catalyzes the oxidation of lignin and lignin-related compounds. Ligninase reacts with H2O2 to form the classical peroxidase intermediates Compounds I and II. We have determined the activation energy of ligninase Compound I formation to be 5.9 kcal/mol. The effect of pH and ionic strength on the rate of ligninase Compound I formation was studied. In contrast to all other peroxidases, no pH effect was observed. This is despite homology of active-site amino acids residues (Tien, M., and Tu, C.-P. D. (1987) Nature 326, 520-523) which are proposed to affect the pH profile of Compound I formation. Ligninase Compound I formation can also be supported by organic peroxides. The second-order rate constants with the organic peroxides are lower, suggesting that H2O2 is the preferred substrate.
AB - Ligninase, isolated from the wood-destroying fungus Phanerochaete chrysosporium, catalyzes the oxidation of lignin and lignin-related compounds. Ligninase reacts with H2O2 to form the classical peroxidase intermediates Compounds I and II. We have determined the activation energy of ligninase Compound I formation to be 5.9 kcal/mol. The effect of pH and ionic strength on the rate of ligninase Compound I formation was studied. In contrast to all other peroxidases, no pH effect was observed. This is despite homology of active-site amino acids residues (Tien, M., and Tu, C.-P. D. (1987) Nature 326, 520-523) which are proposed to affect the pH profile of Compound I formation. Ligninase Compound I formation can also be supported by organic peroxides. The second-order rate constants with the organic peroxides are lower, suggesting that H2O2 is the preferred substrate.
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U2 - 10.1016/s0021-9258(19)57285-4
DO - 10.1016/s0021-9258(19)57285-4
M3 - Article
C2 - 3335539
AN - SCOPUS:0024296184
SN - 0021-9258
VL - 263
SP - 1195
EP - 1198
JO - The Journal of biological chemistry
JF - The Journal of biological chemistry
IS - 3
ER -