Splicing factor 1 is a protein that in humans is encoded by the SF1gene (previously ZNF162). This protein is involved in removing introns from pre-mRNA as part of RNA splicing. In yeast, it is also frequently called Branchpoint Binding Protein (BBP), since it binds to the branch point sequence (BPS) of introns.
Summary of spliceosome formation. SF1 is involved in U2 binding during the second step.
SF1 is a splicing factor which contributes to the formation of the major spliceosome complex. In particular, after the U2AF1-U2AF2 heterodimer binds to the 3’ end of the intron, SF1 binds to an adjacent motif in the RNA called the branch point sequence (BPS). Afterwards U2 spliceosomal RNA displaces SF1, and itself binds to the BPS.
In yeast
The role of the protein in yeast cells has been the subject of study. The BPS that the protein binds to is UACUAAC.
↑"Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
↑"Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
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