Results

RDF/XMLNTriplesTurtleShow queryShare ▶
SubjectPredicateObject
http://purl.uniprot.org/citations/14617070http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/14617070http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/14617070http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Citation
http://purl.uniprot.org/citations/14617070http://www.w3.org/2000/01/rdf-schema#comment"About 15% of flowering plant species synthesize fructans. Fructans serve mainly as reserve carbohydrates and are subject to breakdown by plant fructan exohydrolases (FEHs), among which 1-FEHs (inulinases) and 6-FEHs (levanases) can be differentiated. This paper describes the unexpected finding that 6-FEHs also occur in plants that do not synthesize fructans. The purification, characterization, cloning and functional analysis of sugar beet (Beta vulgaris L.) 6-FEH are described. Enzyme activity measurements during sugar beet development suggest a constitutive expression of the gene in sugar beet roots. Classical enzyme purification followed by in-gel trypsin digestion and mass spectrometry (quadruple-time-of-flight mass spectrometry (Q-TOF) MS) led to peptide sequence information used in subsequent RT-PCR based cloning. Levan-type fructans (beta-2,6) are the best substrates for the enzyme, while inulin-type fructans (beta-2,1) and sucrose are poorly or not degraded. Sugar beet 6-FEH is more related to cell wall invertases than to vacuolar invertases and has a low iso-electric point (pI), clearly different from typical high pI cell wall invertases. Poor sequence homology to bacterial or fungal FEHs makes an endophytic origin highly unlikely. The functionality of the 6-FEH cDNA was further demonstrated by heterologous expression in Pichia pastoris. As fructans are absent in sugar beet, the role of 6-FEH in planta is not obvious. Like chitinases and beta-glucanases hydrolysing cell-surface components of fungal plant pathogens, a straightforward working hypothesis for further research might be that plant 6-FEHs participate in hydrolysis (or prevent the formation) of levan-containing slime surrounding endophytic or phytopathogenic bacteria."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.org/dc/terms/identifier"doi:10.1046/j.1365-313x.2003.01912.x"xsd:string
http://purl.uniprot.org/citations/14617070http://purl.org/dc/terms/identifier"doi:10.1046/j.1365-313x.2003.01912.x"xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Clerens S."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Clerens S."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"De Coninck B."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"De Coninck B."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Van Laere A."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Van Laere A."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Van den Ende W."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Van den Ende W."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Vergauwen R."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/author"Vergauwen R."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/date"2003"xsd:gYear
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/date"2003"xsd:gYear
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/name"Plant J."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/name"Plant J."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/pages"697-710"xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/pages"697-710"xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/title"Unexpected presence of fructan 6-exohydrolases (6-FEHs) in non-fructan plants: characterization, cloning, mass mapping and functional analysis of a novel 'cell-wall invertase-like' specific 6-FEH from sugar beet (Beta vulgaris L.)."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/title"Unexpected presence of fructan 6-exohydrolases (6-FEHs) in non-fructan plants: characterization, cloning, mass mapping and functional analysis of a novel 'cell-wall invertase-like' specific 6-FEH from sugar beet (Beta vulgaris L.)."xsd:string
http://purl.uniprot.org/citations/14617070http://purl.uniprot.org/core/volume"36"xsd:string
▶