ISSN:
1573-6881
Keywords:
Porin
;
VDAC (voltage-dependent anion-selective channel)
;
transmembrane arrangement
;
β-strands
;
mitochondria
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
,
Chemistry and Pharmacology
,
Physics
Notes:
Abstract Porin or voltage-dependent anion-selective channel (VDAC) is the main protein responsible for the high permeability of the outer mitochondrial membrane. The mitochondrial porin is mainly composed of sided β-strands, in analogy with bacterial porin, whose structure has been resolved at 1.8 Å resolution. In mitochondrial porins the N-terminal region forms an amphipathic α-helix, a structure conserved in organisms very distant from the evolutionary point of view. This part of the protein is exposed to the water phase, as demonstrated by ELISA assays. Various extramembranous loops have been identified by specific proteolytic cleavages. These overall, combined results were used to draw a model of the transmembrane arrangement of mammalian porin. This model is compared to other mitochondrial and bacterial porin models.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00769526
