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Molecular and Cellular Biology, October 2002, p. 7093-7104, Vol. 22, No. 20
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.20.7093-7104.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

The Stem-Loop Binding Protein Is Required for Efficient Translation of Histone mRNA In Vivo and In Vitro

Program in Molecular Biology and Biotechnology, Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599

Received 6 May 2002/ Returned for modification 9 July 2002/ Accepted 17 July 2002

Metazoan replication-dependent histone mRNAs end in a conserved stem-loop rather than in the poly(A) tail found on all other mRNAs. The 3' end of histone mRNA binds a single class of proteins, the stem-loop binding proteins (SLBP). In Xenopus, there are two SLBPs: xSLBP1, the homologue of the mammalian SLBP, which is required for processing of histone pre-mRNA, and xSLBP2, which is expressed only during oogenesis and is bound to the stored histone mRNA in Xenopus oocytes. The stem-loop is required for efficient translation of histone mRNAs and substitutes for the poly(A) tail, which is required for efficient translation of other eucaryotic mRNAs. When a rabbit reticulocyte lysate is programmed with uncapped luciferase mRNA ending in the histone stem-loop, there is a three- to sixfold increase in translation in the presence of xSLBP1 while xSLBP2 has no effect on translation. Neither SLBP affected the translation of a luciferase mRNA ending in a mutant stem-loop that does not bind SLBP. Capped luciferase mRNAs ending in the stem-loop were injected into Xenopus oocytes after overexpression of either xSLBP1 or xSLBP2. Overexpression of xSLBP1 in the oocytes stimulated translation, while overexpression of xSLBP2 reduced translation of the luciferase mRNA ending in the histone stem-loop. A small region in the N-terminal portion of xSLBP1 is required to stimulate translation both in vivo and in vitro. An MS2-human SLBP1 fusion protein can activate translation of a reporter mRNA ending in an MS2 binding site, indicating that xSLBP1 only needs to be recruited to the 3' end of the mRNA but does not need to be directly bound to the histone stem-loop to activate translation.

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