title: Noncatalytic docking domains of cellulosomes of anaerobic fungi.
abstract: A method is presented for the specific isolation of genes encoding cellulosome components from anaerobic fungi. The catalytic components of the cellulosome of anaerobic fungi typically contain, besides the catalytic domain, mostly two copies of a 40-amino-acid cysteine-rich, noncatalytic docking domain (NCDD) interspaced by short linkers. Degenerate primers were designed to anneal to the highly conserved region within the NCDDs of the monocentric fungus Piromyces sp. strain E2 and the polycentric fungus Orpinomyces sp. strain PC-2. Through PCR using cDNA from Orpinomyces sp. and genomic DNA from Piromyces sp. as templates, respectively, 9 and 19 PCR products were isolated encoding novel NCDD linker sequences. Screening of an Orpinomyces sp. cDNA library with four of these PCR products resulted in the isolation of new genes encoding cellulosome components. An alignment of the partial NCDD sequence information obtained and an alignment of database-accessible NCDD sequences, focusing on the number and position of cysteine residues, indicated the presence of three structural subfamilies within fungal NCDDs. Furthermore, evidence is presented that the NCDDs in CelC from the polycentric fungus Orpinomyces sp. strain PC-2 specifically recognize four proteins in a cellulosome preparation, indicating the presence of multiple scaffoldins.
authors.affiliation: Department of Microbiology, Faculty of Science, University of Nijmegen, NL-6525 ED Nijmegen, The Netherlands.
authors.forename: P J
authors.initials: PJ
authors.lastname: Steenbakkers
authors.forename: X L
authors.initials: XL
authors.lastname: Li
authors.forename: E A
authors.initials: EA
authors.lastname: Ximenes
authors.forename: J G
authors.initials: JG
authors.lastname: Arts
authors.forename: H
authors.initials: H
authors.lastname: Chen
authors.forename: L G
authors.initials: LG
authors.lastname: Ljungdahl
authors.forename: H J
authors.initials: HJ
authors.lastname: Op Den Camp
mesh_terms: D000595:Amino Acid Sequence; D000693:Anaerobiosis; D001426:Bacterial Proteins; D001665:Binding Sites / Q000235:genetics; D002480:Cellulase / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D002482:Cellulose / Q000378:metabolism*; D017931:DNA Primers; D018076:DNA, Complementary; D004271:DNA, Fungal / Q000235:genetics; D008361:Mannosidases / Q000235:genetics; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000235:genetics / Q000378:metabolism; D020085:Neocallimastigales / Q000201:enzymology* / Q000235:genetics; D020089:Piromyces / Q000201:enzymology* / Q000235:genetics; D016133:Polymerase Chain Reaction; D017434:Protein Structure, Tertiary; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D001617:beta-Glucosidase / Q000378:metabolism; D044902:beta-Mannosidase
chemical_list: D001426:Bacterial Proteins; D017931:DNA Primers; D018076:DNA, Complementary; D004271:DNA, Fungal; D009097:Multienzyme Complexes; D002482:Cellulose; D008361:Mannosidases; C083712:celC protein, bacteria; D001617:beta-Glucosidase; D044902:beta-Mannosidase; C101903:CelJ protein, Clostridium thermocellum; D002480:Cellulase