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The Downstream Core Element Is Recognized by TAF1 Wright State University CORE Scholar Physics Faculty Publications Physics 11-2005 Functional Characterization of Core Promoter Elements: The Downstream Core Element is Recognized by TAF1 Dong-Hoon Lee Naum I. Gershenzon Wright State University - Main Campus, [email protected] Malavika Gupta Ilya P. Ioshikhes Danny Reinberg See next page for additional authors Follow this and additional works at: https://corescholar.libraries.wright.edu/physics Part of the Physics Commons Repository Citation Lee, D., Gershenzon, N. I., Gupta, M., Ioshikhes, I. P., Reinberg, D., & Lewis, B. A. (2005). Functional Characterization of Core Promoter Elements: The Downstream Core Element is Recognized by TAF1. Molecular and Cellular Biology, 25 (21), 9674-9686. https://corescholar.libraries.wright.edu/physics/559 This Article is brought to you for free and open access by the Physics at CORE Scholar. It has been accepted for inclusion in Physics Faculty Publications by an authorized administrator of CORE Scholar. For more information, please contact [email protected]. Authors Dong-Hoon Lee, Naum I. Gershenzon, Malavika Gupta, Ilya P. Ioshikhes, Danny Reinberg, and Brian A. Lewis This article is available at CORE Scholar: https://corescholar.libraries.wright.edu/physics/559 MOLECULAR AND CELLULAR BIOLOGY, Nov. 2005, p. 9674–9686 Vol. 25, No. 21 0270-7306/05/$08.00ϩ0 doi:10.1128/MCB.25.21.9674–9686.2005 Copyright © 2005, American Society for Microbiology. All Rights Reserved. Functional Characterization of Core Promoter Elements: the Downstream Core Element Is Recognized by TAF1† Dong-Hoon Lee,1 Naum Gershenzon,3 Malavika Gupta,1 Ilya P. Ioshikhes,3 Danny Reinberg,1,2 and Brian A. Lewis1* Department of Biochemistry1 and Howard Hughes Medical Institute, Division of Nucleic Acids Enzymology,2 University of Medicine and Dentistry of New Jersey, Robert Wood Johnson Medical School, 683 Hoes Lane, Piscataway, New Jersey 08854, and Department of Biomedical Informatics, The Ohio State University, 3184 Graves Hall, 333 W. 10th Ave., Columbus, Ohio 432103 Received 22 November 2004/Returned for modification 10 December 2004/Accepted 5 August 2005 Downstream elements are a newly appreciated class of core promoter elements of RNA polymerase II- transcribed genes. The downstream core element (DCE) was discovered in the human ␤-globin promoter, and its sequence composition is distinct from that of the downstream promoter element (DPE). We show here that the DCE is a bona fide core promoter element present in a large number of promoters and with high incidence in promoters containing a TATA motif. Database analysis indicates that the DCE is found in diverse promot- ers, supporting its functional relevance in a variety of promoter contexts. The DCE consists of three subele- ments, and DCE function is recapitulated in a TFIID-dependent manner. Subelement 3 can function inde- pendently of the other two and shows a TFIID requirement as well. UV photo-cross-linking results demonstrate that TAF1/TAFII250 interacts with the DCE subelement DNA in a sequence-dependent manner. These data show that downstream elements consist of at least two types, those of the DPE class and those of the DCE class; they function via different DNA sequences and interact with different transcription activation factors. Finally, these data argue that TFIID is, in fact, a core promoter recognition complex. Promoters transcribed by RNA polymerase II are complex box (20). Lastly, some activators display preferences for par- and composed of different classes of elements, one of which ticular core promoter architectures (7, 18, 56). consists of the core promoter elements represented by the This perception of core promoters lacking diversity is being TATA box, the TFIIBresponse elment (BRE), the initiator, revised with the findings of other core promoter elements such the downstream promoter element (DPE), and other newly as the BRE (41) and elements located downstream of the recognized elements (reviewed in reference 73). One view of transcriptional start site such as the DPE (5, 6, 40, 89), the core promoters is that they are fairly ubiquitous and that they downstream core element (DCE) (43), and the motif 10 ele- play only a trivial role in transcriptional regulation. According ment (MTE) (48). The most studied of these downstream to this view, the uniqueness and specificity inherent in a pro- elements is the DPE. The DPE was discovered during the moter derive from the various DNA binding activators and analysis of TFIID interactions with several Drosophila promot- coactivators that recognize the regulatory elements usually lo- ers (5, 6). The DPE is centered at approximately ϩ30 relative cated upstream of the TATA box and/or initiator. The small to the transcriptional start site. Thus far, it has been shown to number of core promoter elements and their apparent lack of function only in TATA-less promoter contexts and is at least diversity compared to that of the staggering numbers of acti- partially redundant in the context of a TATA box (6). Addi- vators have supported such a view. Also contributing to this tional indications of core promoter specificity arose from stud- view is the fact that core promoters have been rather poorly ies showing that specific enhancers require a specific core pro- studied in their natural context, and thus, regulatory phenom- moter structure containing either a TATA box or DPE (7, 56). ena may have been missed. A second class of downstream elements which are architec- Yet there are a few examples where the core promoter turally distinct from the DPE exists. Initially discovered in the apparently plays a very specific role. Early examples include human ␤-globin promoter, the DCE consists of three subele- studies of the myoglobin and simian virus 40 TATA boxes (86) ments. Point mutations in each subelement are found in hu- and the hsp70 TATA box (72) that indicated a requirement for man ␤-thalassemia patients (this paper and references 2, 8, 24, TATA boxes of a particular sequence. The TdT promoter was also shown to become inactive upon the inclusion of a TATA 31, 57, and 90). As with the DPE, experiments suggested that TFIID recognized the DCE in vitro (43). Here we confirm and extend these observations by showing that the adenovirus ma- jor late promoter (Ad MLP), Ad E3, Ad IX, and the herpes * Corresponding author. Mailing address: Department of Biochem- simplex virus (HSV) UL38 promoters contain functional DCE istry, Robert Woods Johnson Medical School, 683 Hoes Lane, Pisca- sequences, thus demonstrating that the DCE is not simply taway, NJ 08854. Phone: (732) 235-4194. Fax: (732) 235-5294. E-mail: restricted to the promoters of the ␤-globin locus. Computer [email protected]. † Supplemental material for this article may be found at http://mcb analysis of promoter databases indicates that DCE sequences .asm.org/. are found in a variety of promoters, further suggesting that the 9674 VOL. 25, 2005 DOWNSTREAM CORE ELEMENT FUNCTION IN VITRO 9675 DCE represents a novel, widely distributed core promoter el- window for the TATA box. For the Inr element, the functional window is Ϫ5to ement. We demonstrate that DCE function can be recapitu- ϩ6 bp since the ϩ1 position in the EPD is defined with an accuracy of Ϯ5 bp. lated in a highly purified transcription system and requires the Since DPE works in cooperation with an Inr if positioned 27 bp downstream from it (5), we applied the window (28 Ϫ 5) –(28 ϩ5) bp for the DPE. A more general transcriptional machinery together with the transcrip- detailed description of the statistical analysis procedure can be found elsewhere tion activation factor (TAF) subunits of the TFIID complex. (21). We also show that TAF1 is the major TAF species that can be To calculate the statistical significance of the occurrence frequency of a sub- element in the functional window, we calculated a parameter (statistical signif- cross-linked to wild-type but not mutant DCE subelements. ͱ icance [dS] measured in units of standard deviation [SD] as Nout) and dS as (Nin Our results show that the DCE represents a distinct class of Ϫ ͱ Nout)/ Nout, where Nin is the number of promoters containing an element or downstream elements and underscores the intricacies in tran- combination inside its functional window and Nout is a statistically expected scriptional regulation at the level of core promoter elements. number obtained for the promoter sequence segments outside the functional window. Site-specific protein-DNA photo-cross-linking. Purification of FLAG-tagged MATERIALS AND METHODS TFIID complexes was essentially as described previously (11). To generate sin- In vitro transcriptions. Nuclear extracts were prepared as described previously gle-stranded mutant DNAs for photo-cross-linking, Ad MLP in pSP72 was di- (15). Primer extensions and crude nuclear extract in vitro transcriptions were as gested with XhoI, filled in at the recessed end, and digested with XbaI. M13mp19 described previously (43, 44). Affinity-purified TFIID was purified as described RF DNA was digested with EcoRI, filled in at the recessed end, and digested previously (34, 43). Reconstituted in vitro transcription assays contained recom- with XbaI. DNAs were ligated and transformed into XL1-Blue cells. Single- binant TFIIA (rTFIIA), rTFIIB, rTFIIE, and rTFIIF (49). TFIIH is a partially stranded template DNAs were prepared as described in Sambrook et al. (66a) purified phenyl-Superose fraction (49). RNA polymerase II was purified to Derivatized promoter DNA fragments containing cross-linking agent at positions ϩ ϩ ϩ homogeneity as described previously (49). The TATA box-binding component of 9, 19, and 31 of the template strand and radiophosphorylated, derivatized TFIID (TBP) and TFIID concentrations used in the in vitro transcriptions were oligodeoxyribonucleotides (10 pmol) were prepared essentially as described pre- determined empirically by titration and correspond to saturating amounts of viously (39). Photo-cross-linking reactions were performed as described previ- each.
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