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. 1984 Dec 1;99(6):1970–1980. doi: 10.1083/jcb.99.6.1970

Purification of a high molecular weight actin filament gelation protein from Acanthamoeba that shares antigenic determinants with vertebrate spectrins

PMCID: PMC2113566  PMID: 6209283

Abstract

I have purified a high molecular weight actin filament gelation protein (GP-260) from Acanthamoeba castellanii, and found by immunological cross-reactivity that it is related to vertebrate spectrins, but not to two other high molecular weight actin-binding proteins, filamin or the microtubule-associated protein, MAP-2. GP-260 was purified by chromatography on DEAE-cellulose, selective precipitation with actin and myosin-II, chromatography on hydroxylapatite in 0.6 M Kl, and selective precipitation at low ionic strength. The yield was 1-2 micrograms/g cells. GP-260 had the same electrophoretic mobility in SDS as the 260,000-mol-wt alpha-chain of spectrin from pig erythrocytes and brain. Electron micrographs of GP-260 shadowed on mica showed slender rod-shaped particles 80-110 nm long. GP-260 raised the low shear apparent viscosity of solutions of Acanthamoeba actin filaments and, at 100 micrograms/ml, formed a gel with a 8 microM actin. Purified antibodies to GP-260 reacted with both 260,000- and 240,000-mol-wt polypeptides in samples of whole ameba proteins separated by gel electrophoresis in SDS, but only the 260,000-mol-wt polypeptide was extracted from the cell with 0.34 M sucrose and purified in this study. These antibodies to GP-260 also reacted with purified spectrin from pig brain and erythrocytes, and antibodies to human erythrocyte spectrin bound to GP-260 and the 240,000-mol-wt polypeptide present in the whole ameba. The antibodies to GP-260 did not bind to chicken gizzard filamin or pig brain MAP-2, but they did react with high molecular weight polypeptides from man, a marsupial, a fish, a clam, a myxomycete, and two other amebas. Fluorescent antibody staining with purified antibodies to GP-260 showed that it is concentrated near the plasma membrane in the ameba.

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Selected References

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