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We describe the isolation and molecular characterization of seven distinct proteins present in human [U4/U6.U5] tri-snRNPs. These proteins exhibit clear homology to the Sm proteins and are thus denoted LSm (like Sm) proteins. Purified LSm proteins form a heteromer that is stable even in the absence of RNA and exhibits a doughnut shape under the electron microscope, with striking similarity to the Sm core RNP structure. The purified LSm heteromer binds specifically to U6 snRNA, requiring the 3'-terminal U-tract for complex formation. The 3'-end of U6 snRNA was also co-precipitated with LSm proteins after digestion of isolated tri-snRNPs with RNaseT(1). Importantly, the LSm proteins did not bind to the U-rich Sm sites of intact U1, U2, U4 or U5 snRNAs, indicating that they can only interact with a 3'-terminal U-tract. Finally, we show that the LSm proteins facilitate the formation of U4/U6 RNA duplices in vitro, suggesting that the LSm proteins may play a role in U4/U6 snRNP formation.
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