Isolation of a new high molecular weight protein associated with desmin and vimentin filaments from avian embryonic skeletal muscle

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Abstract
Filaments with a diameter of 80-120 A have been prepared from 14-d-old chick embryonic skeletal muscle, using a physiological salt solution and gel filtration chromatography. The filaments obtained are composed of the two known muscle intermediate-filament proteins, vimentin and desmin, as well as the vimentin- and desmin-associated high molecular weight protein, synemin (230,000 mol. wt). In addition, they contain a previously unidentified high molecular weight protein (280,000 mol wt) which differs from synemin by isoelectric point, molecular weight, and immunological reactivity.