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Towards a Mechanistic Understanding of P element Transposition Using Single-Particle Cryo-EM
- Elizabeth H. Kellogg, George Ghanim, Eva Nogales, Donald C. Rio
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- Journal:
- Microscopy and Microanalysis / Volume 25 / Issue S2 / August 2019
- Published online by Cambridge University Press:
- 05 August 2019, pp. 1288-1289
- Print publication:
- August 2019
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- By Rose Teteki Abbey, K. C. Abraham, David Tuesday Adamo, LeRoy H. Aden, Efrain Agosto, Victor Aguilan, Gillian T. W. Ahlgren, Charanjit Kaur AjitSingh, Dorothy B E A Akoto, Giuseppe Alberigo, Daniel E. Albrecht, Ruth Albrecht, Daniel O. Aleshire, Urs Altermatt, Anand Amaladass, Michael Amaladoss, James N. Amanze, Lesley G. Anderson, Thomas C. Anderson, Victor Anderson, Hope S. Antone, María Pilar Aquino, Paula Arai, Victorio Araya Guillén, S. Wesley Ariarajah, Ellen T. Armour, Brett Gregory Armstrong, Atsuhiro Asano, Naim Stifan Ateek, Mahmoud Ayoub, John Alembillah Azumah, Mercedes L. García Bachmann, Irena Backus, J. Wayne Baker, Mieke Bal, Lewis V. Baldwin, William Barbieri, António Barbosa da Silva, David Basinger, Bolaji Olukemi Bateye, Oswald Bayer, Daniel H. Bays, Rosalie Beck, Nancy Elizabeth Bedford, Guy-Thomas Bedouelle, Chorbishop Seely Beggiani, Wolfgang Behringer, Christopher M. Bellitto, Byard Bennett, Harold V. Bennett, Teresa Berger, Miguel A. Bernad, Henley Bernard, Alan E. Bernstein, Jon L. Berquist, Johannes Beutler, Ana María Bidegain, Matthew P. Binkewicz, Jennifer Bird, Joseph Blenkinsopp, Dmytro Bondarenko, Paulo Bonfatti, Riet en Pim Bons-Storm, Jessica A. Boon, Marcus J. Borg, Mark Bosco, Peter C. Bouteneff, François Bovon, William D. Bowman, Paul S. Boyer, David Brakke, Richard E. Brantley, Marcus Braybrooke, Ian Breward, Ênio José da Costa Brito, Jewel Spears Brooker, Johannes Brosseder, Nicholas Canfield Read Brown, Robert F. Brown, Pamela K. Brubaker, Walter Brueggemann, Bishop Colin O. Buchanan, Stanley M. Burgess, Amy Nelson Burnett, J. Patout Burns, David B. Burrell, David Buttrick, James P. Byrd, Lavinia Byrne, Gerado Caetano, Marcos Caldas, Alkiviadis Calivas, William J. Callahan, Salvatore Calomino, Euan K. Cameron, William S. Campbell, Marcelo Ayres Camurça, Daniel F. Caner, Paul E. Capetz, Carlos F. Cardoza-Orlandi, Patrick W. Carey, Barbara Carvill, Hal Cauthron, Subhadra Mitra Channa, Mark D. Chapman, James H. Charlesworth, Kenneth R. Chase, Chen Zemin, Luciano Chianeque, Philip Chia Phin Yin, Francisca H. Chimhanda, Daniel Chiquete, John T. Chirban, Soobin Choi, Robert Choquette, Mita Choudhury, Gerald Christianson, John Chryssavgis, Sejong Chun, Esther Chung-Kim, Charles M. A. Clark, Elizabeth A. Clark, Sathianathan Clarke, Fred Cloud, John B. Cobb, W. Owen Cole, John A Coleman, John J. Collins, Sylvia Collins-Mayo, Paul K. Conkin, Beth A. Conklin, Sean Connolly, Demetrios J. Constantelos, Michael A. Conway, Paula M. Cooey, Austin Cooper, Michael L. Cooper-White, Pamela Cooper-White, L. William Countryman, Sérgio Coutinho, Pamela Couture, Shannon Craigo-Snell, James L. Crenshaw, David Crowner, Humberto Horacio Cucchetti, Lawrence S. Cunningham, Elizabeth Mason Currier, Emmanuel Cutrone, Mary L. Daniel, David D. Daniels, Robert Darden, Rolf Darge, Isaiah Dau, Jeffry C. Davis, Jane Dawson, Valentin Dedji, John W. de Gruchy, Paul DeHart, Wendy J. 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- Edited by Daniel Patte, Vanderbilt University, Tennessee
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- Book:
- The Cambridge Dictionary of Christianity
- Published online:
- 05 August 2012
- Print publication:
- 20 September 2010, pp xi-xliv
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An in vitro-selected RNA-binding site for the KH domain protein PSI acts as a splicing inhibitor element
- ASOKA K. AMARASINGHE, ROBIN MacDIARMID, MELISSA D. ADAMS, DONALD C. RIO
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P element somatic inhibitor (PSI) is a 97-kDa RNA-binding protein with four KH motifs that is involved in the inhibition of splicing of the Drosophila P element third intron (IVS3) in somatic cells. PSI interacts with a negative regulatory element in the IVS3 5′ exon. This element contains two pseudo-5′ splice sites, termed F1 and F2. To identify high affinity binding sites for the PSI protein, in vitro selection (SELEX) was performed using a random RNA oligonucleotide pool. Alignment of high affinity PSI-binding RNAs revealed a degenerate consensus sequence consisting of a short core motif of CUU flanked by alternative purines and pyrimidines. Interestingly, this sequence resembles the F2 pseudo-5′ splice site in the P element negative regulatory element. Additionally, a negative in vitro selection of PCR-mutagenized P element 5′ exon regulatory element RNAs identified two U residues in the F1 and F2 pseudo-5′ splice sites as important nucleotides for PSI binding and the U residue in the F2 region is a nearly invariant nucleotide in the consensus SELEX motif. The high affinity PSI SELEX sequence acted as a splicing inhibitor when placed in the context of a P element splicing pre-mRNA in vitro. Data from in vitro splicing assays, UV crosslinking and RNA-binding competition experiments indicates a strong correlation between the binding affinities of PSI for the SELEX sequences and their ability to modulate splicing of P element IVS3 in vitro.
Purification of Drosophila snRNPs and characterization of two populations of functional U1 particles
- EMMANUEL LABOURIER, DONALD C. RIO
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U1 snRNP is required at an early stage during assembly of the spliceosome, the dynamic ribonucleoprotein (RNP) complex that performs nuclear pre-mRNA splicing. Here, we report the purification of U1 snRNP particles from Drosophila nuclear extracts and the characterization of their biochemical properties, polypeptide contents, and splicing activities. On the basis of their antigenicity, apparent molecular weight, and by peptide sequencing, the Drosophila 70K, SNF, B, U1-C, D1, D2, D3, E, F, and G proteins are shown to be integral components of these particles. Sequence database searches revealed that both the U1-specific and the Sm proteins are extensively conserved between human and Drosophila snRNPs. Furthermore, both species possess a conserved intrinsic U1-associated kinase activity with identical substrate specificity in vitro. Finally, our results demonstrate that a second type of functional U1 particle, completely lacking the U1/U2-specific protein SNF and the associated protein kinase activity, can be isolated from cultured Kc cell or Canton S embryonic nuclear extracts. This work describes the first characterization of a purified Drosophila snRNP particle and reinforces the view that their activity and composition, with the exception of the atypical bifunctional U1-A/U2-B″ SNF protein, are highly conserved in metazoans.
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