Send to

Choose Destination
Anal Biochem. 1999 Oct 15;274(2):270-7.

Alkaline density gradient floatation of membranes: polypeptide composition of the mammalian peroxisomal membrane.

Author information

Instituto de Biologia Molecular e Celular, Universidade do Porto, Porto, Portugal.


A method for purification of the peroxisomal membrane from rat liver is described. The procedure consists of floating the (contaminated) peroxisomal membranes through an alkaline sucrose density gradient. A good resolution between the peroxisomal membrane and other membrane systems is achieved. Using these floated peroxisomal membranes we have determined that only 7.8 +/- 0.9% of the total peroxisomal protein is alkali resistant. The polypeptide composition of these highly pure peroxisomal membranes was analyzed by SDS-PAGE. Bands corresponding to polypeptides with apparent molecular masses of 15, 18, 22, 24, 26, 29, 35, 36, 38, 40, 52, 55, 70, 74-77, and 88 kDa are detected upon Coomassie blue staining of polyacrylamide gels. The identity of several of these polypeptides was determined by N-terminal sequencing and Western blotting analysis.

[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Elsevier Science
Loading ...
Support Center