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Vol. 9, Issue 7, 1695-1708, July 1998

Department of Neurobiology,
¶Program in Neuroscience,
Harvard Medical School, Boston, Massachusetts 02115
Association of mRNA with the cytoskeleton represents a fundamental
aspect of RNA physiology likely involved in mRNA transport, anchoring,
translation, and turnover. We report the initial characterization of a
protein complex that binds RNA in a sequence-independent but
size-dependent manner in vitro. The complex includes a ~160-kDa protein that is bound directly to mRNA and that appears to be either
identical or highly related to a ~1600-kDa protein that binds
directly to mRNA in vivo. In addition, the microtubule-associated protein, MAP 1A, a cytoskeletal associated protein is a component of
this complex. We suggest that the general attachment of mRNA to the
cytoskeleton may be mediated, in part, through the formation of this
ribonucleoprotein complex.
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