Biochemical and immunological studies on clathrin light chains and their binding sites on clathrin triskelions - PubMed (original) (raw)
Biochemical and immunological studies on clathrin light chains and their binding sites on clathrin triskelions
E Ungewickell. EMBO J. 1983.
Abstract
Clathrin light chains from bovine brain tissue (LC alpha and LC beta) are monomeric proteins with an average mol. wt. of approximately 33,000, as determined by sedimentation equilibrium. Solution studies on purified light chains indicate a large Stokes radius (Re = 3.3 nm) and little defined secondary structure. Both light chains bind specifically and with high affinity (KA approximately 5 x 10(7)/M) to overlapping sites on clathrin heavy chains. These binding sites are contained within a 125,000 dalton heavy chain fragment that forms truncated triskelions with legs, 15 nm shorter than those of intact triskelions. As judged by immuno-electron microscopy, light chain-specific IgG molecules bind mostly to the center of triskelions, but there are also sites that are scattered some 16 nm along the proximal part of triskelion legs. From heterologous binding experiments using human placenta light chains and heavy chain fragments from bovine brain clathrin, it is concluded that the domains of light and heavy chains that are involved in the interaction are conserved across tissue and species boundaries.
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