Abstract
We have investigated the abilities of extracellular enzymes from dark-grown cell-suspension cultures of sycamore maple (Acer pseudoplatanus L.) to oxidize monolignols, the precursors for lignin biosynthesis in plants, as well as a variety of other lignin-related compounds. Laccase and peroxidase both exist as a multiplicity of isoenzymes in filtrates of spent culture medium, but their abilities to produce water-insoluble, dehydrogenation polymers (DHPs) from the monolignols (in the presence of hydrogen peroxide for the peroxidase reaction) appear identical whether or not the enzymes are purified from the concentrated filtrates or left in a crude mixture. The patterns of bonds formed in these DHPs are identical to those found in DHPs synthesized using horseradish peroxidase or fungal laccase, and many of these bonds are found in the natural lignins extracted from different plant sources. On the other hand, sycamore maple laccase is very much less active on phenolic substrates containing multiple aromatic rings than is sycamore maple peroxidase. We suggst that whereas laccase may function during the early stages of lignification to polymerize monolignols into oligo-lignols, cell-wall peroxidases may function when H2O2 is produced during the later stages of xylem cell development or in response to environmental stresses.
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Abbreviations
- DHP:
-
dehydrogenation polymer
- IEF:
-
isoelectric focuring
- NMR:
-
nuclear magnetic resonance
- PAGE:
-
polyacrylamide gel electrophoresis
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The authors wish to thank Dr. Masahiro Samejima (University of Tokyo) for provision of lignin model compounds and Dr. Göran Gellerstadt (Royal Institute of Technology, Sweden) for helpful suggestions regarding stilbene formation and light spectroscopy. Monolignols were prepared by Mr. Nate Weymouth with help from Dr. Herb Morrison (USDA/ARS, Richard B. Russell Research Center, Athens, GA). Thanks also to Ms. Izabella Poppe of the Complex Carbohydrate Research Center (CCRC) for assistance with carbohydrate analyses, and Mr. Vincent Sorrentino for help with the growth of cell-suspension cultures.
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Sterjiades, R., Dean, J.F.D., Gamble, G. et al. Extracellular laccases and peroxidases from sycamore maple (Acer pseudoplatanus) cell-suspension cultures. Planta 190, 75–87 (1993). https://doi.org/10.1007/BF00195678
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DOI: https://doi.org/10.1007/BF00195678