Porin is present in the plasma membrane where it is concentrated in caveolae and caveolae-related domains

G. Báthori, Isabella Parolini, Francesco Tombola, Ildikò Szabò, Angela Messina, Marta Oliva, Vito De Pinto, Michael Lisanti, Massimo Sargiacomo, Mario Zoratti

Research output: Contribution to journalArticle

102 Citations (Scopus)

Abstract

Mitochondrial porin, or voltage-dependent anion channel, is a pore- forming protein first discovered in the outer mitochondrial membrane. Later investigations have provided indications for its presence also in other cellular membranes, including the plasma membrane, and in caveolae. This extra-mitochondrial localization is debated and no clear-cut conclusion has been reached up to now. In this work, we used biochemical and electrophysiological techniques to detect and characterize porin within isolated caveolae and caveolae-like domains (low density Triton-insoluble fractions). A new procedure was used to isolate porin from plasma membrane. The outer surface of cultured CEM cells was biotinylated by an impermeable reagent. Low density Triton-insoluble fractions were prepared from the labeled cells and used as starting material to purify a biotinylated protein with the same electrophoretic mobility and immunoreactivity of mitochondrial porin. In planar bilayers, the porin from these sources formed slightly anion-selective pores with properties indistinguishable from those of mitochondrial porin. This work thus provides a strong indication of the presence of porin in the plasma membrane, and specifically in caveolae and caveolae-like domains.

Original languageEnglish
Pages (from-to)29607-29612
Number of pages6
JournalJournal of Biological Chemistry
Volume274
Issue number42
DOIs
Publication statusPublished - Oct 15 1999

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Caveolae
Porins
Cell membranes
Cell Membrane
Voltage-Dependent Anion Channels
Membranes
Electrophoretic mobility
Mitochondrial Membranes
Anions
Proteins
Cultured Cells

ASJC Scopus subject areas

  • Biochemistry

Cite this

Porin is present in the plasma membrane where it is concentrated in caveolae and caveolae-related domains. / Báthori, G.; Parolini, Isabella; Tombola, Francesco; Szabò, Ildikò; Messina, Angela; Oliva, Marta; De Pinto, Vito; Lisanti, Michael; Sargiacomo, Massimo; Zoratti, Mario.

In: Journal of Biological Chemistry, Vol. 274, No. 42, 15.10.1999, p. 29607-29612.

Research output: Contribution to journalArticle

Báthori, G, Parolini, I, Tombola, F, Szabò, I, Messina, A, Oliva, M, De Pinto, V, Lisanti, M, Sargiacomo, M & Zoratti, M 1999, 'Porin is present in the plasma membrane where it is concentrated in caveolae and caveolae-related domains', Journal of Biological Chemistry, vol. 274, no. 42, pp. 29607-29612. https://doi.org/10.1074/jbc.274.42.29607
Báthori, G. ; Parolini, Isabella ; Tombola, Francesco ; Szabò, Ildikò ; Messina, Angela ; Oliva, Marta ; De Pinto, Vito ; Lisanti, Michael ; Sargiacomo, Massimo ; Zoratti, Mario. / Porin is present in the plasma membrane where it is concentrated in caveolae and caveolae-related domains. In: Journal of Biological Chemistry. 1999 ; Vol. 274, No. 42. pp. 29607-29612.
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