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J. Biol. Chem., Vol. 259, Issue 20, 12873-12880, 10, 1984
A Bretscher
A method for the rapid purification of caldesmon, an F-actin binding
protein of smooth muscle, has been developed. Caldesmon remains native
after heating at 90 degrees C, a property that provides the basis for the
purification in high yield of both caldesmon and tropomyosin, another
heat-stable protein of smooth muscle. Caldesmon purified by this procedure
is a highly asymmetric protein with a sedimentation coefficient of
approximately 2.7 S and a Stokes radius of about 91 A. The protein exists
as two polypeptide chains of Mr = 135,000 and 140,000, with each Mr
polypeptide being resolvable into several isoelectric species. Estimates
based on densitometry of stained gels suggest that caldesmon is more
abundant in smooth muscle than filamin or alpha-actinin. Purified caldesmon
bound to F-actin in the pH range 6- 8. Binding was unaffected by Ca2+ or
Mg2+ at up to millimolar levels. Binding was saturable, with a polypeptide
molar ratio of about one caldesmon to six actins at saturation. F-actin
binding was not inhibited by saturating levels of tropomyosin. Caldesmon
dramatically increased the viscosity of F-actin. Light microscopy and
electron microscopy of negatively stained material revealed that caldesmon
induced the formation of massive F-actin bundles which contained up to
hundreds of filaments. Electron microscopy of sectioned caldesmon-
saturated F-actin mixtures revealed large bundles which appeared to include
linear arrays of regularly spaced actin filaments cut transversely,
exhibiting a center to center spacing of 15 nm. Possible structural
implications based on the existence of these structures is presented.
Smooth muscle caldesmon. Rapid purification and F-actin cross-linking properties
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