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EMBO J
1987 Nov 01;611:3479-85. doi: 10.1002/j.1460-2075.1987.tb02672.x.
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In vitro assembly of U1 snRNPs.
Hamm J
,
Kazmaier M
,
Mattaj IW
.
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An efficient system for the in vitro assembly of U1 snRNPs is described. RNA-protein interactions in a series of U1 snRNA mutants assembled both in vivo and in vitro were studied in order to verify the accuracy of the system. Two discrete protein binding sites are defined by immunoprecipitation with antibodies against different protein components of the U1 snRNP and a newly developed protein sequestering assay. The U1 snRNP-specific proteins 70K and A require only the 5'-most stem-loop structure of U1 snRNA for binding, the common U snRNP proteins require the conserved Sm binding site (AUnG). Interactions between these two groups of proteins are detected. These results are combined to derive a model of the U1 snRNP structure. The potential use of the in vitro system in the functional analysis of U1 snRNP proteins is discussed.
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