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. 1980 Jun;77(6):3264–3268. doi: 10.1073/pnas.77.6.3264

Phosphorylation and dephosphorylation of spectrin from human erythrocyte ghosts under physiological conditions: autocatalysis rather than reaction with separate kinase and phosphatase.

B A Imhof, H J Acha-Orbea, T A Libermann, B F Reber, J H Lanz, K H Winterhalter, W Birchmeier
PMCID: PMC349595  PMID: 6932020

Abstract

The mechanism of phosphosylation and dephosphorylation of spectrin from human erythrocyte membranes has been examined under closely physiological conditions. The results support the hypothesis that spectrin is an autophosphorylating and dephosphorylating system. (i) Extraction from ghosts of up to 85% of the kinase (casein kinase) suggested to catalyze the reaction [see Fairbanks, G., Avruch, J., Dino, E. J. & Patel, V. P. (1978) J. Supramol. Struct. 9, 97--112] only slightly reduced spectrin component 2 phosphorylation and did not affect ATP-induced changes in the ghosts' shapes. (ii) A spectrin--actin complex isolated from endocytotic inside-out vesicles under hyperteonic conditions contained virtually no casein kinase activity and still exhibited a largely intact phosphorylation machinery. (iii) Photoaffinity labeling experiments indicated that spectrin component 2 fulfills the necessary prerequisite of the hypothesis--i.e., it contains its own ATP-binding site. (iv) Under various conditions, spectrin phosphorylation and dephospohrylation seem to be tightly coupled. The implications of these findings for the understanding of spectrin function and the maintenance of erythrocyte shape are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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