Functional expression of cloned human splicing factor SF2: homology to RNA-binding proteins, U1 70K, and Drosophila splicing regulators.
SF2 is a protein factor essential for constitutive pre-mRNA splicing in HeLa cell extracts and also activates proximal alternative 5' splice sites in a concentration-dependent manner. This latter property suggests a role for SF2 in preventing exon skipping, ensuring the accuracy of splicing, and regulating alternative splicing. Human SF2 cDNAs have been isolated and overexpressed in bacteria. Recombinant SF2 is active in splicing and stimulates proximal 5' splice sites. SF2 has a C-terminal region rich in arginine-serine dipeptides, similar to the RS domains of the U1 snRNP 70K polypeptide and the Drosophila alternative splicing regulators transformer, transformer-2, and suppressor-of-white-apricot. Like transformer-2 and 70K, SF2 contains an RNP-type RNA recognition motif.
Krainer
A R
AR
Cold Spring Harbor Laboratory, New York 11724-2208.
Mayeda
A
A
Kozak
D
D
Binns
G
G
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism; D003001:Cloning, Molecular; D004330:Drosophila / Q000235:genetics*; D015723:Gene Library; D006367:HeLa Cells / Q000502:physiology; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D006801:Humans; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D015345:Oligonucleotide Probes; D014176:Protein Biosynthesis; D012326:RNA Splicing; D012342:RNA, Small Nuclear / Q000235:genetics; D016601:RNA-Binding Proteins; D012261:Ribonucleoproteins / Q000235:genetics*; D017411:Ribonucleoproteins, Small Nuclear; D012689:Sequence Homology, Nucleic Acid; D000068103:Serine-Arginine Splicing Factors
D002352:Carrier Proteins; D034441:Heterogeneous-Nuclear Ribonucleoproteins; D009687:Nuclear Proteins; D015345:Oligonucleotide Probes; D012342:RNA, Small Nuclear; D016601:RNA-Binding Proteins; D012261:Ribonucleoproteins; D017411:Ribonucleoproteins, Small Nuclear; D000068103:Serine-Arginine Splicing Factors