Ostreolysin, a pore-forming protein from the oyster mushroom, interacts specifically with membrane cholesterol-rich lipid domains.
Ostreolysin, a 15 kDa pore-forming protein from the edible oyster mushroom (Pleurotus ostreatus), is lytic to membranes containing both cholesterol and sphingomyelin. Its cytotoxicity to Chinese hamster ovary cells correlates with their cholesterol contents and with the occurrence of ostreolysin in the cells detergent resistant membranes. Moreover, ostreolysin binds to supported monolayers and efficiently permeabilizes sonicated lipid vesicles, only if cholesterol is combined with either sphingomyelin or dipalmitoylphosphatidylcholine. Addition of mono- or di-unsaturated phosphatidylcholine to the cholesterol/sphingomyelin vesicles dramatically reduces the ostreolysin's activity. It appears that the protein recognizes specifically a cholesterol-rich lipid phase, probably the liquid-ordered phase.
Sepcić
Kristina
K
Department of Biology, Biotechnical Faculty, University of Ljubljana, Vecna pot 111, 1000 Ljubljana, Slovenia.
Berne
Sabina
S
Rebolj
Katja
K
Batista
Urska
U
Plemenitas
Ana
A
Sentjurc
Marjeta
M
Macek
Peter
P
D015060:1,2-Dipalmitoylphosphatidylcholine / Q000378:metabolism; D000818:Animals; D016466:CHO Cells; D002784:Cholesterol / Q000378:metabolism*; D006224:Cricetinae; D005452:Fluoresceins / Q000378:metabolism; D005456:Fluorescent Dyes / Q000378:metabolism; D005656:Fungal Proteins / Q000378:metabolism; D006460:Hemolysin Proteins / Q000378:metabolism*; D021962:Membrane Microdomains / Q000737:chemistry / Q000378:metabolism*; D020076:Pleurotus / Q000737:chemistry*; D011485:Protein Binding; D013109:Sphingomyelins / Q000378:metabolism
D005452:Fluoresceins; D005456:Fluorescent Dyes; D005656:Fungal Proteins; D006460:Hemolysin Proteins; D013109:Sphingomyelins; C461280:ostreolysin; D015060:1,2-Dipalmitoylphosphatidylcholine; D002784:Cholesterol; C007740:fluorexon