title: Biochemistry of lipolytic enzymes secreted by Penicillium solitum and Cladosporium cladosporioides.
abstract: Two distinct extracellular lipases were obtained from Penicillium solitum 194A, isolated from domestic compost, and Cladosporium cladosporioides 194B, isolated from dairy wastewater. These alkaline enzymes had molecular masses of 42 and 30 kDa, respectively. The P. solitum 194A lipase differed in mass from previously reported enzyme, indicating that it is a novel lipase, and indicating that penicillia can secrete lipase isoenzymes. The C. cladosporioides lipase was more active on esters of medium-chain acids, whereas the P. solitum lipase was more active on longer chained substrates. The C. cladosporioides enzyme displayed higher thermal stability than the P. solitum lipase, preserving full activity up to 48 °C and showing a T₅₀ (10 min) of 60 °C. Their different catalytic properties and good protein stability should make these enzymes suitable for biotechnological applications. Furthermore, the combined use of these two fungal strains may prove to be valuable in lipid-rich waste management.
authors.affiliation: a Mycology Laboratory, Department of Earth and Environmental Sciences , University of Pavia , Pavia , Italy.
authors.forename: Selene
authors.initials: S
authors.lastname: Chinaglia
authors.forename: Laurent R
authors.initials: LR
authors.lastname: Chiarelli
authors.forename: Maristella
authors.initials: M
authors.lastname: Maggi
authors.forename: Marinella
authors.initials: M
authors.lastname: Rodolfi
authors.forename: Giovanna
authors.initials: G
authors.lastname: Valentini
authors.forename: Anna Maria
authors.initials: AM
authors.lastname: Picco
mesh_terms: D055162:Biocatalysis; D002963:Cladosporium / Q000166:cytology / Q000201:enzymology* / Q000302:isolation & purification; D003612:Dairying; D004795:Enzyme Stability; D005110:Extracellular Space / Q000201:enzymology; D006863:Hydrogen-Ion Concentration; D008049:Lipase / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D008066:Lipolysis; D008670:Metals / Q000494:pharmacology; D010407:Penicillium / Q000166:cytology / Q000201:enzymology* / Q000302:isolation & purification; D012988:Soil Microbiology; D013696:Temperature; D062065:Wastewater / Q000382:microbiology
chemical_list: D008049:Lipase; D008670:Metals; D062065:Wastewater
keywords: Cladosporium cladosporioides; Penicillium solitum; alkaline lipase; lipase isoenzymes; lipolytic activity