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Base-pair conformational switch modulates miR-34a targeting of Sirt1 mRNA 期刊论文
NATURE, 2020, 583 (7814) : 139-+
作者:  Muniz, Juan A.;  Barberena, Diego;  Lewis-Swan, Robert J.;  Young, Dylan J.;  Cline, Julia R. K.;  Rey, Ana Maria;  Thompson, James K.
收藏  |  浏览/下载:28/0  |  提交时间:2020/07/03

MicroRNAs (miRNAs) regulate the levels of translation of messenger RNAs (mRNAs). At present, the major parameter that can explain the selection of the target mRNA and the efficiency of translation repression is the base pairing between the '  seed'  region of the miRNA and its counterpart mRNA(1). Here we use R-1 rho relaxation-dispersion nuclear magnetic resonance(2) and molecular simulations(3) to reveal a dynamic switch-based on the rearrangement of a single base pair in the miRNA-mRNA duplex-that elongates a weak five-base-pair seed to a complete seven-base-pair seed. This switch also causes coaxial stacking of the seed and supplementary helix fitting into human Argonaute 2 protein (Ago2), reminiscent of an active state in prokaryotic Ago(4,5). Stabilizing this transient state leads to enhanced repression of the target mRNA in cells, revealing the importance of this miRNA-mRNA structure. Our observations tie together previous findings regarding the stepwise miRNA targeting process from an initial '  screening'  state to an '  active'  state, and unveil the role of the RNA duplex beyond the seed in Ago2.


Repression of a messenger RNA by a cognate microRNA depends not only on complementary base pairing, but also on the rearrangement of a single base pair, producing a conformation that fits better within the human Ago2 protein.


  
Amphibian fungal panzootic causes catastrophic and ongoing loss of biodiversity 期刊论文
SCIENCE, 2019, 363 (6434) : 1459-+
作者:  Scheele, Ben C.;  Pasmans, Frank;  Skerratt, Lee F.;  Berger, Lee;  Martel, An;  Beukema, Wouter;  Acevedo, Aldemar A.;  Burrowes, Patricia A.;  Carvalho, Tamilie;  Catenazzi, Alessandro;  De la Riva, Ignacio;  Fisher, Matthew C.;  Flechas, Sandra V.;  Foster, Claire N.;  Frias-Alvarez, Patricia;  Garner, Trenton W. J.;  Gratwicke, Brian;  Guayasamin, Juan M.;  Hirschfeld, Mareike;  Kolby, Jonathan E.;  Kosch, Tiffany A.;  La Marca, Enrique;  Lindenmayer, David B.;  Lips, Karen R.;  Longo, Ana V.;  Maneyro, Raul;  McDonald, Cait A.;  Mendelson, Joseph, III;  Palacios-Rodriguez, Pablo;  Parra-Olea, Gabriela;  Richards-Zawacki, Corinne L.;  Roedel, Mark-Oliver;  Rovito, Sean M.;  Soto-Azat, Claudio;  Toledo, Luis Felipe;  Voyles, Jamie;  Weldon, Che;  Whitfield, Steven M.;  Wilkinson, Mark;  Zamudio, Kelly R.;  Canessa, Stefano
收藏  |  浏览/下载:37/0  |  提交时间:2019/11/27
Provenance of the Neoproterozoic deep-water Zerrissene Group of the Damara Orogen, Namibia, and paleogeographic implications for the closing of the Adamastor Ocean and assembly of the Gondwana supercontinent 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2019, 131: 355-371
作者:  Nieminski, Nora M.;  Grove, Marty;  Lowe, Donald R.
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/09
Empowering Latina scientists 期刊论文
SCIENCE, 2019, 363 (6429) : 825-826
作者:  Bernal, Ximena E.;  Rojas, Bibiana;  Pinto-E, Maria Alejandra;  Mendoza-Henao, Angela M.;  Herrera-Montes, Adriana;  Isabel Herrera-Montes, Maria;  Caceres Franco, Andrea del Pilar;  Ceron-Souza, Ivania;  Paz, Andrea;  Vergara, Daniela;  Barragan Contreras, Leidy Alejandra;  Salazar, Camilo;  Bohorquez Alonso, Martha Lucia;  Guarnizo, Carlos E.;  Sanchez, Adriana;  Olaya-Castro, Alexandra;  Urbina-Cardona, Nicolas;  Guayasamin, Juan M.;  Uy, Floria Mora-Kepfer;  Feris, Faride Lamadrid;  Franco-Orozco, Barbara;  Munoz, Martha M.;  Patricia Rincon-Diaz, Martha;  Sanchez Herrera, Melissa;  Betancourth-Cundar, Mileidy;  Tarvin, Rebecca D.;  Marquez, Roberto;  Lopez-Aguirre, Camilo;  Ron, Santiago R.;  Ramirez, Santiago;  Paez-Vacas, Monica;  Gaitan-Espitia, Juan Diego;  Navarrete-Mendez, Maria J.;  Vianna, Juliana A.;  Varela-Jaramillo, Andrea;  Sanchez-Martinez, Paola M.;  Caminer Rodriguez, Marcel Adrian;  Garcia-Robledo, Carlos;  Kuprewicz, Erin K.;  Gomez-Bahamon, Valentina;  Chacon-Vargas, Katherine;  Trillo, Alex;  Ramirez Castaneda, Valeria;  Buenaventura, Eliana;  Carolina Monmany-Garzia, A.;  Carolina Carnaval, Ana;  Dick, Christopher W.;  Jose Andrade-Nunez, Maria;  Carvajal Castro, Juan David;  Marcela Pinto, Diana;  Camargo-Sanabria, Angela A.;  Lips, Karen R.;  Motta-Gonzalez, Diana;  Canedo, Clarissa;  Melissa Diaz, Jhandra;  Navarro-Suarez, Adriana M.;  Corredor, Karen;  Roa-Varon, Adela;  Flechas, Sandra V.;  Andres Martinez-Lanfranco, Juan;  Chiarioni Thome, Maria Tereza;  Caldwell, Michael S.;  Ballestas, Onil;  Mejia M, Carolina;  Chaverri, Gloriana;  Rossi, Alejandra;  Bonaccorso, Elisa;  Pimiento, Catalina;  Guerrero, Rafael F.;  Warkentin, Karen M.;  Montoya-Pachongo, Carolina;  Alvarez, Silvia J.;  Gonzalez-Duran, Gustavo;  Anganoy-Criollo, Marvin;  Martinez-Habibe, Maria Cristina;  Ramirez, Juan P.;  Burrowes, Patricia;  Catenazzi, Alessandro;  Riveros, Andre J.;  Targino, Mariane;  Velez, Alejandro;  Vargas, Oscar M.;  Zapata, Felipe;  Waltrick, Camilla Spengler;  Ceron, Karoline;  Segovia Salcedo, Claudia;  Silva-Velasco, Martha;  Ochoa-Herrera, Valeria;  Medina, Iliana;  Narins, Peter M.;  Alves Saccol, Suelen da Silva;  de Castro Godinho, Marcela Brasil;  Velasquez Escobar, Beatriz Eugenia;  Velasco, Julian A.;  Lomascolo, Silvia;  Hoke, Kim;  Zeidemann, Vivian;  Almeida-Santos, Patricia;  Paola Ferraro, Daiana;  Araujo-Vieira, Katyuscia;  da Rocha, Sabine Borges;  Torres, Maria Fernanda;  Daniel Cadena, Carlos;  Collevatti, Rosane Garcia;  Vasconcellos, Mariana Mira;  Recart, Wilnelia;  Mitchell Aide, T.;  Bacon, Christine;  Jeckel, Adriana Moriguchi;  Diele-Viegas, Luisa Maria;  Calijorne Lourenco, Ana Carolina;  Santos, Danusy Lopes;  Rieder Cholak, Luiza;  Mendes, Roberta Graboski;  Silva, Fernanda Magalhaes;  Guedes, Thais;  Lopez-Perilla, Yeny R.;  Fusinatto, Luciana Ardenghi;  Terra, Juliana de Souza;  Rodriguez Brenes, Sofia;  Narvaez, Andrea E.;  Zina, Juliana;  Calderon-Espinosa, Martha L.;  Pardo-Diaz, Carolina;  Abadie, Michelle;  Maldonado-Chaparro, Adriana;  Cespedes Arias, Laura N.;  Montesinos, Rachel;  Fenker, Jessica;  Brunes, Tuliana Oliveira;  Ferreira Lantyer Silva, Amanda Santiago;  Vallejos, Johana Goyes;  Costa Rodrigues, Ana Paula V.;  Friol, Natalia Rizzo;  Herrera-Alvarez, Santiago;  de Souza, Eletra;  Araujo, Olivia G. S.;  Citeli, Nathalie Q. K.;  Ruggeri, Joice;  Fierro-Calderon, Eliana;  Acevedo-Charry, Orlando;  Barato, Paola;  Campos-Cerqueira, Marconi;  Mazzini, Flavia;  Beltran, Ivan;  Alejandra Meneses-Giorgi, Maria;  Jerez, Adriana;  Clavijo, Andrea P.;  Neira Jimenez, Carolina;  Dantas, Gisele P. M.;  Nascimento, Luciana Barreto;  Caballero, Susana J.;  Henao Sepulveda, A. Carolina;  Wolff, Marta;  Barnabe, Paula Cristina;  Quinones-Lebron, Shakira G.;  Bressan, Raissa Fries;  Gomez-Montoya, Nataly;  Gomez, Camila;  Colon-Pineiro, Zuania;  Esquivel Dobles, Carolina;  Bloch, Natasha;  Stynoski, Jennifer L.;  Arango, Daniel;  Marisol Gonzalez, Tania;  Luque Moreno, Francisco;  Taylor, Ryan;  Lawrence, J. P.;  Briscoe, Adriana Darielle Mejia;  Ortiz-Barrientos, Daniel;  Elena Salerno, Patricia;  Restrepo, Silvia;  Pasukonis, Andrius;  Damasceno, Roberta Pacheco;  Cecilia Dalton, Maria;  Proehl, Heike;  Valdez-Ward, Evelyn;  Andrea Rodriguez, Sabrina;  Marquez Garcia, Marcela;  Bianca Bonaparte, Eugenia;  Molina Escobar, Jorge Alberto;  Brown, Jason L.;  Yeager, Justin;  Kikuchi, David;  Ringler, Max;  Duran, Linda Hernandez;  Schulte, Lisa M.;  Vaira, Marcos;  Pereyra, Laura;  Astudillo Bravo, Diana;  Jose Salica, Maria;  Varga, Sandra;  Eguren, Antonieta;  Grattarola, Florencia;  Bernal, Moises A.;  Soledad Gaston, Maria;  Ortega Chinchilla, Jesus Eduardo;  Burdfield-Steel, Emily;  Valencia, Lina M.;  Ringler, Eva;  Rada, Marco;  Melendez-Ackerman, Elvia;  Botero, Carlos A.;  Estrada-Villegas, Sergio;  Orizaola, German;  Pinto, Brendan J.;  Gonzalez-Bellido, Paloma;  Hunter, Kimberly L.;  Rueda Solano, Luis Alberto;  Gordon, Swanne;  Guerra, Monica A.;  Jose Albo, Maria;  Vega-Frutis, Rocio;  Blundo, Cecilia;  Castaneda-Gomez, Laura;  Donnelly, Maureen A.;  Escobar, Betsabe D. Castro;  Isabel Moreno, Maria;  Crawford, Andrew J.;  Jiggins, Chris D.;  Roessler, Daniela C.;  Bravo Valencia, Laura;  Sarmiento, Carolina;  Munoz, Karen A.;  Galeano, Sandra P.;  del Rosario Castaneda, Maria;  Caro Cardenas, Cindy Jeanet;  Zalamea, Paul-Camilo;  Arias, Monica;  Zank, Caroline;  Suarez-Mayorga, Angela M.;  Colombo, Patrick;  Cuervo, Andres M.;  Coriolano, Iara Reinaldo;  de Melo, Lilian Sayuri Ouchi;  Buitrago Cardona, Alexandra;  Elias, Marianne;  Gonzalez, Mabel;  Maria Aldana, Ana;  Gubert, Carolina;  Luis Parra, Juan;  Contador, Tamara;  Coelho, Lorena;  Trillo, Mariana;  Bordin, Kauane;  Zulian, Viviane;  Moreno Arias, Rafael;  Loretto, Matthias-Claudio;  Alejandra Medina, Claudia;  Lyra, Mariana L.;  Pulido-Santacruz, Paola;  Rosser, Neil;  Waldron, Talia;  Moreno Duran, Carmen Helena;  Pizano, Camila;  Hoedl, Walter;  Fratani, Jessica;  Duport Bru, Ana Sofia;  Grosso, Jimena;  Vera Candioti, Florencia;  Adarve Rengifo, Isabel
收藏  |  浏览/下载:28/0  |  提交时间:2019/11/27
Legislation restricts research in Uruguay 期刊论文
SCIENCE, 2018, 362 (6418) : 1008-1008
作者:  Sommaruga, Ruben;  Rodriguez-Grana, Laura;  Calliari, Danilo;  Lercari, Diego;  Aubriot, Luis
收藏  |  浏览/下载:9/0  |  提交时间:2019/11/27