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Enzymology of Cellulose, Hemicellulose, and Lignin Degradation

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Enzymology of Cellulose, Hemicellulose, and Lignin Degradation Heterobasidion annosum and wood decay: Enzymology of cellulose, hemicellulose, and lignin degradation Pekka Maijala Department of Biosciences, Division of Plant Physiology University of Helsinki Academic Dissertation To be presented with the permission of The Faculty of Science, University of Helsinki, for public criticism in the auditorium 1041 at Viikki Biocenter (Viikinkaari 5, Helsinki) on March 31, 2000, at 12 o'clock noon. Helsinki 2000 Supervisor: Professor Marjatta Raudaskoski Department of Biosciences Division of Plant Physiology University of Helsinki, Finland Reviewers: Docent Marja-Leena Niku-Paavola VTT Biotechnology VTT, Finland Docent Robin Sen Department of Biosciences Division of Microbiology University of Helsinki, Finland Opponent: Dr. Stephen Woodward Senior Lecturer Department of Forestry University of Aberdeen, U.K. ISBN 951-45-9269-7 (PDF version) URL: http://ethesis.helsinki.fi/julkaisut/mat/bioti/vk/maijala Helsingin yliopiston verkkojulkaisut, Helsinki, 2000 Front cover: Different stages in the decay of spruce wood tracheids infected by Heterobasidion annosum are presented in the drawing above taken from R. Hartig (1878). The yellow-coloured parts contain lignin, the colourless parts contain mainly cellulose. The amino acid sequences below are segments of six aligned manganese peroxidases, which were translated from the manganese peroxidase encoding gene fragments identified in Heterobasidion and other related taxa. ABSTRACT Many fungi secrete enzymes that facilitate wood decay. Depending on the ecology of a particular fungus, the production of wood-decaying enzymes has evolved to sustain the niche the fungus is occupying. In some plant-fungus associations this has led to an effective wood decay; in other cases to the loss of efficient enzyme secretion. Cellulolytic and hemicellulolytic enzyme production of a pathogenic white-rot fungus Heterobasidion annosum was studied and the activities were compared with cellulolytic activities of root symbiotic ectomycorrhizal fungi. Ligninolytic activity of H. annosum was studied in more detail by three different means: (1) enzyme activities were analysed by biochemical assays, (2) gene fragments encoding ligninolytic enzymes were characterised and (3) lignin mineralisation under solid state conditions was measured. The cellulolytic activities of H. annosum were much stronger in comparison to the corresponding activities detected in the ectomycorrhizal fungi Suillus bovinus, Paxillus involutus and Amanita regalis. Both cellulolytic and hemicellulolytic activities of H. annosum were repressed by glucose while in S. bovinus clear cellulolytic activity was observed in the presence of glucose. When the enzymes were further characterised by native gel electrophoresis, some of the putative endoglucanases appeared to have similar mobilities in both the ectomycorrhizal fungi and in H. annosum. A number of cellulose-binding proteins were detected in H. annosum that were absent in ectomycorrhizal fungi. Several endoglucanase isozymes with different isoelectric points were identified in the P and S intersterility groups of H. annosum. The recognition of endoglucanases and cellobiohydrolases of H. annosum by polyclonal antibodies raised against cellulolytic enzymes of Trichoderma reesei indicated serological similarities between the enzymes of these two phylogenetically distant fungal species. The activities of a range of hemicellulolytic enzymes, xylanase, ß-xylosidase, acetyl esterase, acetylxylan esterase, mannanase and α-galactosidase, were investigated in H. annosum. The P- and S-intersterility groups of H. annosum each had a characteristic xylanase and mannanase isoenzyme pattern. A xylanase with a pI of 8.4 was only detected in the P-strain in a medium supplemented with pure xylan. The pI- values of the acidic isoenzymes in both strains overlapped with those having mannanase and endoglucanase activities. Young mycelium of the P-strain produced mannanases with pI-values which differed from those expressed during later stages of growth. Xylanases and mannanases of H. annosum also cross-reacted with polyclonal antibodies to xylanase and mannanase from T. reesei. H. annosum was shown to be a moderately ligninolytic fungus. Manganese peroxidases from a homokaryotic P-strain were partially purified by ion exchange chromatography and characterised using isoelectric focusing. Three isoenzymes with pIs of 3.3, 3.5, and 3.7 were found in spruce wood chips cultures. Interestingly, three manganese peroxidase encoding gene sequence fragments were identified in European H. annosum P-type, and four distinct fragments in the S-type of H. annosum using PCR with degenerate primers. Similar gene fragments were also detected in several other closely related wood-rotting basidiomycetes. The gene sequences among different species of Heterobasidion genus share about 80 to 92% identity at the tentative amino acid level, and are similar with other known fungal lignin peroxidase and manganese peroxidase genes. The intron positions were identical in all the analysed genes and species. The characterised fragments share several conserved residues which are important for the structure and function of a manganese peroxidase. Residues involved in Ca2+ and Mn2+-ion binding, and the proximal histidine-residue involved in the catalysis were highly conserved in all the investigated fragments. The sequence data of these fragments was used for the construction of phylogenetic trees and analysis of relationships among the different intersterility groups. Variation within the sequences was also noted between the different intersterility groups of H. annosum. PREFACE Most of this work was carried out at the then Department of Botany, Division of Plant Physiology, Helsinki University, and during the last three years at the Division of Plant Physiology of the new Department of Biosciences. I am very grateful to Professor Liisa Simola for her support and encouraging attitude towards my thesis, and for providing good working facilities at her Department. I thank Docents Marja-Leena Niku-Paavola and Robin Sen for their critical reading of the manuscript and for their valuable comments. I express my gratitude to Professor Marjatta Raudaskoski, my supervisor, who guided me to the fascinating world of fungi. Her support, encouragement, inspiring attitude and enthusiasm were impressive. I also wish to thank Professor Liisa Viikari for her support during my visit to VTT Biotechnology and Food Research. The technical assistance and advice of Ms. Riitta Isoniemi at VTT is especially acknowledged. I wish to thank Professor Kurt Messner for welcoming me in his group for two years at Vienna Technical University. During that period he enabled me to prepare my Licenciate Thesis. I warmly thank Doctor Ewald Srebotnik, who introduced me to the interesting world of fungal lignin biodegradation and Viennese habits. I am grateful also to Doctors Paul Ander and Takashi Watanabe for pleasant collaboration and useful discussions during my Vienna-period. Very special thanks are due to Professor Tom Harrington from Iowa State University, who has significantly contributed to the peroxidase sequence analysis, and has kindly supported and encouraged my work. I warmly thank Doctor Kari Korhonen for his help, encouragement and fruitful discussions concerning Heterobasidion complexity. During the several years at the Plant Physiology Division many persons have contributed in the creation of a positive atmosphere in the lab and have been very supportive throughout the work. Especially I wish to thank Sara Niini for her help and warm friendship, Kurt Fagerstedt for most pleasant collaboration, encouragement and advice and Marjukka Uuskallio for the skilled and always flexible technical assistance. My special thanks are due to Olga Blokhina, Micce Färdig, Markus Gorfer, Kristiina Himanen, Anne Huuskonen, Jarmo Juuti, Kristo Kulju, Anna Kärkönen, Erja Laitiainen, Saara Laitinen, Leena-Maija Nokkala, Harri Nyberg, Markku Ojala, Riikka Piispanen, Vanamo Salo, Arja Santanen, Outi Sorri, Mika Tarkka, Mari Valkonen, Ritva Vasara, Eija Virolainen, Helena Åström, and others for help and great company. The latest lab environment for my work has been at Professor Annele Hatakka's group at the Viikki Biocenter. The valuable comments and advice for this thesis from Annele are sincerely acknowledged. The support, help and company of the whole group are greatly appreciated. Especially Pauliina Lankinen for help in MnP purification, Kari Steffen for help in preparing the figures for this thesis, Sari Galkin for help in HPLC- analyses of veratryl alcohol metabolites, and Mika Kalsi for IEF-analyses, are greatly appreciated. My thanks are due to my dearest ones, family and friends for giving me so much joy and happiness outside the lab. My wife Hanna has given me enormous support, love and understanding throughout the years. Without her patience this work would have never been realised. Lastly, my dearest thanks are due to my parents Mielikki and Mikael for their love and support. Financial support from the Emil Aaltonen Foundation, The Academy of Finland, and the Alfred Kordelin Foundation are gratefully acknowledged. Helsinki, March 2000 Pekka Maijala Dear flat rock facing the stream Where the willows are sweeping over my wine cup again If you say that the spring wind has no understanding Why should it come blowing me these falling flowers? Wang Wei To Hanna 7 TABLE OF CONTENTS ABSTRACT PREFACE LIST OF ORIGINAL PUBLICATIONS...............................................................
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