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Monospecific antibodies reveal details of U2 snRNP structure and interaction between U1 and U2 snRNPs.

I W Mattaj,W J Habets,W J van Venrooij
PMCID: PMC1166893  PMID:2941274

Abstract

Monospecific antibodies directed against several U small nuclear ribonucleoprotein (U snRNP) particle proteins were affinity purified from a patient's anti-(U1,U2)RNP serum. These were used to demonstrate that: (i) proteins equivalent to the mammalian U2 snRNP-specific A' and B" proteins are present in Xenopus laevis oocytes; (ii) both proteins A' and B" have the same structural requirements for binding to U2 snRNA; (iii) proteins B, B' and D have the same structural requirement for binding to U2 snRNA; (iv) using very high specific activity RNA probes it is possible to detect a fraction of either U1 or U2 snRNA precipitable by antibodies directed against proteins specific for the other U snRNP, indicating an interaction between U1 and U2 snRNPs. The structural requirements of this interaction were studied for the U2 snRNP. All changes made to U2 snRNA or snRNP structure resulted in loss of the interaction with U1 snRNP.

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Selected References

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