New insight into the interaction of TRAF2 C-terminal domain with lipid raft microdomains.
Biochim Biophys Acta Mol Cell Biol Lipids
; 1862(9): 813-822, 2017 Sep.
Article
em En
| MEDLINE
| ID: mdl-28499815
ABSTRACT
In this study we provide the first evidence of the interaction of a truncated-TRAF2 with lipid raft microdomains. We have analyzed this interaction by measuring the diffusion coefficient of the protein in large and giant unilamellar vesicles (LUVs and GUVs, respectively) obtained both from synthetic lipid mixtures and from natural extracts. Steady-state fluorescence measurements performed with synthetic vesicles indicate that this truncated form of TRAF2 displays a tighter binding to raft-like LUVs with respect to the control (POPC-containing LUVs), and that this process depends on the protein oligomeric state. Generalized Polarization measurements and spectral phasor analysis revealed that truncated-TRAF2 affects the membrane fluidity, especially when vesicles are heated up at physiological temperature. The addition of nanomolar concentration of TRAF2 in GUVs also seems to exert a mechanical action, as demonstrated by the formation of intraluminal vesicles, a process in which ganglioside GM1 plays a crucial role.
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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Microdomínios da Membrana
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Fator 2 Associado a Receptor de TNF
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Bicamadas Lipídicas
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Lipídeos
Limite:
Humans
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article