Transcription and RNA Processing

ID #1147

Are splicesomes and snRNPs the same thing?? I thought snRNPs removed the introns and connected exons...but that's what splicesomes do too!

The spliceosome is the entire complex of material that's taking part in splicing. So that includes the precursor mRNA that's being spliced, and all of the different snRNPs, which in turn remember are themselves composed of proteins and small nuclear RNAs.

It's kind of like saying "A replication complex copies DNA" versus saying "DNA polymerases copy DNA." Both statements are accurate; one is just describing the entire set of molecules (which for a replication complex also includes helicase, primase, and so forth), while the other is talking about the actual molecule(s) doing the specific job.

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