The initial surface composition and topography modulate sphingomyelinase-driven sphingomyelin to ceramide conversion in lipid monolayers.
Changes of the initial composition and topography of mixed monolayers of Sphingomyelin and Ceramide modulate the degradation of Sphingomyelin by Bacillus cereus Sphingomyelinase. The presence of initial lateral phase boundary due to coexisting condensed and expanded phase domains favors the precatalytic steps of the reaction. The amount and quality of the domain lateral interface, defined by the type of boundary undulation, appears as a modulatory supramolecular code which regulates the catalytic efficiency of the enzyme. The long range domain lattice structuring is determined by the Sphingomyelinase activity.
De Tullio
Luisina
L
Departamento de Química Biológica, Facultad de Ciencias Químicas - CONICET, Universidad Nacional de Córdoba, Haya de la Torre y Medina Allende, Ciudad Universitaria, X5000HUA Córdoba, República Argentina.
Maggio
Bruno
B
Hartel
Steffen
S
Jara
Jorge
J
Fanani
Maria Laura
ML
D001921:Brain / Q000378:metabolism; D002384:Catalysis; D002518:Ceramides / Q000737:chemistry*; D007700:Kinetics; D008055:Lipids / Q000737:chemistry*; D008856:Microscopy, Fluorescence; D015233:Models, Statistical; D019308:Palmitic Acid / Q000737:chemistry; D010743:Phospholipids / Q000737:chemistry; D017434:Protein Structure, Tertiary; D012984:Software; D013108:Sphingomyelin Phosphodiesterase / Q000737:chemistry*; D013109:Sphingomyelins / Q000737:chemistry*; D013499:Surface Properties; D013997:Time Factors
D002518:Ceramides; D008055:Lipids; D010743:Phospholipids; D013109:Sphingomyelins; D019308:Palmitic Acid; D013108:Sphingomyelin Phosphodiesterase