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Molecular and Cellular Biology, December 2000, p. 9225-9235, Vol. 20, No. 24
Verna and Marrs McLean Department of
Biochemistry and Molecular Biology, Baylor College of Medicine,
Houston, Texas 77030
Received 19 April 2000/Returned for modification 7 June
2000/Accepted 19 September 2000
Intronic G triplets are frequently located adjacent to 5' splice
sites in vertebrate pre-mRNAs and have been correlated with splicing
efficiency and specificity via a mechanism that activates upstream 5'
splice sites in exons containing duplicated sites (26).
Using an intron dependent upon G triplets for maximal activity and 5'
splice site specificity, we determined that these elements bind U1
snRNPs via base pairing with U1 RNA. This interaction is
novel in that it uses nucleotides 8 to 10 of U1 RNA and is independent
of nucleotides 1 to 7. In vivo functionality of base pairing was
documented by restoring activity and specificity to mutated G triplets
through compensating U1 RNA mutations. We suggest that the G-rich
region near vertebrate 5' splice sites promotes accurate splice site
recognition by recruiting the U1 snRNP.
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
An Intronic Splicing Enhancer Binds U1
snRNPs To Enhance Splicing and Select 5' Splice
Sites
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Corresponding author. Mailing address: Verna and Marrs
McLean Department of Biochemistry, Baylor College of Medicine, Houston, TX 77030. Phone: (713) 798-4622. Fax: (713) 795-5487. E-mail: andrewm{at}bcm.tmc.edu.
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