Water pores in planar lipid bilayers at fast and slow rise of transmembrane voltage

Maček Lebar, Alenka (avtor), Miklavčič, Damijan (avtor), Kotulska, Małgorzata (avtor), Kramar, Peter (avtor)

Basic understanding of the barrier properties of biological membranes can be obtained by studying model systems, such as planar lipid bilayers. Here, we study water pores in planar lipid bilayers in the presence of transmembrane voltage. Planar lipid bilayers were exposed to fast and slow linearly increasing voltage and current signals. We measured the capacitance, breakdown voltage, and rupture time of planar lipid bilayers composed of 1-pamitoyl 2-oleoyl phosphatidylcholine (POPC), 1-pamitoyl 2-oleoyl phosphatidylserine (POPS), and a mixture of both lipids in a 1:1 ratio. Based on the measurements, we evaluated the change in the capacitance of the planar lipid bilayer corresponding to water pores, the radius of water pores at membrane rupture, and the fraction of the area of the planar lipid bilayer occupied by water pores. The estimated pore radii determining the rupture of the planar lipid bilayer upon fast build-up of transmembrane voltage are 0.101 nm, 0.110 nm, and 0.106 nm for membranes composed of POPC, POPS, and POPC:POPS, respectively. The fraction of the surface occupied by water pores at the moment of rupture of the planar lipid bilayer is in the range of 0.1–1.8%.

• Jezik: Angleški jezik
• Ključne besede: planar lipid bilayer, capacitance, voltage breakdown, water pores, hydrophobic pores
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FE - Fakulteta za elektrotehniko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2021
• Št. strani: 16 str.
• Številčenje: Vol. 11, iss. 4, art. 263
• PID: 20.500.12556/RUL-135349
• UDK: 577
• ISSN pri članku: 2077-0375
• DOI: 10.3390/membranes11040263
• COBISS.SI-ID: 59163139
• Datum objave v RUL: 08.03.2022

Gradivo je del revije

• Naslov: Membranes
• Skrajšan naslov: Membranes
• Založnik: MDPI
• ISSN: 2077-0375
• COBISS.SI-ID: 519125529

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 05.04.2021

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: ravninski lipidni dvosloj, kapacitivnost, porušitvena napetost, vodne pore, hidrofobne pore