Electron microscopic analysis of tropomyosin paracrystals

Journal of Biochemistry
E Katayama, Y Nonomura

Abstract

Negatively stained images of divalent cation-induced tropomyosin paracrystals show polymorphic patterns which are almost bipolar. Although these bipolar forms are naturally due to antiparallel arrays of molecules, the precise molecular arrangements have not been clarified yet except in the case of one type of these polymorphic paracrystals by Stewart and McLachlan [(1976) J. Mol. Biol. 103, 251--269]. In the previous paper we showed that the lead-induced polar paracrystal is a parallel and in-register array of tropomyosin molecules. Moreover, we have made it possible to locate a given residue on the staining pattern. By overlapping two photographic transparencies of the polar paracrystal antiparallel, directly observed images of polymorphic bipolar paracrystals could be synthesized photographically with fidelity. The overlap length between N-terminals of antiparallel pairs of molecules could be easily determined without any assumptions. Next, we considered the stabilizing forces involved in the morphogenesis of such polymorphic paracrystals. The cation-bridged attractive forces already proposed by some groups were insufficient to account for the stability of some specific forms of tropomyosin paracrystals. From the primary amin...Continue Reading

Citations

Jan 1, 1984·Ultrastructural Pathology
Oct 1, 1988·Journal of Muscle Research and Cell Motility·N Yagi
Feb 13, 2010·Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association·Hiroshi OhtaniKen-ichi Sawada

Related Concepts

Metazoa
Polymorphism, Crystallization
Drug Stability
Hydrogen-Ion Concentration
Electron Microscopy
Muscle
Protein Conformation
Chinchilla Rabbits
Miniparamyosin

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