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Extra-intestinal pathogenic E. coli (ExPEC), including avian pathogenic E. coli (APEC), pose a considerable threat to both human and animal health, with illness causing substantial economic loss. APEC strain χ7122 (O78∶K80∶H9), containing three large plasmids [pChi7122-1 (IncFIB/FIIA-FIC), pChi7122-2 (IncFII), and pChi7122-3 (IncI2)]; and a small plasmid pChi7122-4 (ColE2-like), has been used for many years as a model strain to study the molecular mechanisms of ExPEC pathogenicity and zoonotic potential. We previously sequenced and characterized the plasmid pChi7122-1 and determined its importance in systemic APEC infection; however the roles of the other pChi7122 plasmids were still ambiguous. Herein we present the sequence of the remaining pChi7122 plasmids, confirming that pChi7122-2 and pChi7122-3 encode an ABC iron transport system (eitABCD) and a putative type IV fimbriae respectively, whereas pChi7122-4 is a cryptic plasmid. New features were also identified, including a gene cluster on pChi7122-2 that is not present in other E. coli strains but is found in Salmonella serovars and is predicted to encode the sugars catabolic pathways. In vitro evaluation of the APEC χ7122 derivative strains with the three large plasmids, either individually or in combinations, provided new insights into the role of plasmids in biofilm formation, bile and acid tolerance, and the interaction of E. coli strains with 3-D cultures of intestinal epithelial cells. In this study, we show that the nature and combinations of plasmids, as well as the background of the host strains, have an effect on these phenomena. Our data reveal new insights into the role of extra-chromosomal sequences in fitness and diversity of ExPEC in their phenotypes.
Streptococcus pneumoniae still causes severe morbidity and mortality worldwide, especially in young children and the elderly. Much effort has been dedicated to developing protein-based universal vaccines to conquer the current shortcomings of capsular vaccines and capsular conjugate vaccines, such as serotype replacement, limited coverage and high costs. A recombinant live vector vaccine delivering protective antigens is a promising way to achieve this goal. In this review, we discuss the researches using live recombinant vaccines, mainly live attenuated Salmonella and lactic acid bacteria, to deliver pneumococcal antigens. We also discuss both the limitations and the future of these vaccines.
Cyanovirin-N (CV-N) is an antiviral lectin with potent activity against enveloped viruses, including HIV. The mechanism of action involves high affinity binding to mannose-rich glycans that decorate the surface of enveloped viruses. In the case of HIV, antiviral activity of CV-N is postulated to require multivalent interactions with envelope protein gp120, achieved through a pseudo-repeat of sequence that adopts two near-identical glycan-binding sites, and possibly involves a 3D-domain-swapped dimeric form of CV-N. Here, we present a covalent dimer of CV-N that increases the number of active glycan-binding sites, and we characterize its ability to recognize four glycans in solution. A CV-N variant was designed in which two native repeats were separated by the “nested” covalent insertion of two additional repeats of CV-N, resulting in four possible glycan-binding sites. The resulting Nested CV-N folds into a wild-type-like structure as assessed by circular dichroism and NMR spectroscopy, and displays high thermal stability with a Tm of 59 °C, identical to WT. All four glycan-binding domains encompassed by the sequence are functional as demonstrated by isothermal titration calorimetry, which revealed two sets of binding events to dimannose with dissociation constants Kd of 25 μM and 900 μM, assigned to domains B and B’ and domains A and A’ respectively. Nested CV-N displays a slight increase in activity when compared to WT CV-N in both an anti-HIV cellular assay and a fusion assay. This construct conserves the original binding specifityies of domain A and B, thus indicating correct fold of the two CV-N repeats. Thus, rational design can be used to increase multivalency in antiviral lectins in a controlled manner.
Myxoma virus (MYXV) is Leporipoxvirus that possesses a specific rabbit‐restricted host tropism but exhibits a much broader cellular host range in cultured cells. MYXV is able to efficiently block all aspects of the type I interferon (IFN)‐induced antiviral state in rabbit cells, partially in human cells and very poorly in mouse cells. The mechanism(s) of this species‐specific inhibition of type I IFN‐induced antiviral state is not well understood. Here we demonstrate that MYXV encoded protein M029, a truncated relative of the vaccinia virus (VACV) E3 double‐stranded RNA (dsRNA) binding protein that inhibits protein kinase R (PKR), can also antagonize the type I IFN‐induced antiviral state in a highly species‐specific manner. In cells pre‐treated with type I IFN prior to infection, MYXV exploits M029 to overcome the induced antiviral state completely in rabbit cells, partially in human cells, but not at all in mouse cells. However, in cells pre‐infected with MYXV, IFN‐induced signaling is fully inhibited even in the absence of M029 in cells from all three species, suggesting that other MYXV protein(s) apart from M029 block IFN signaling in a speciesindependent manner. We also show that the antiviral state induced in rabbit, human or mouse cells by type I IFN can inhibit M029‐knockout MYXV even when PKR is genetically knocked‐out, suggesting that M029 targets other host proteins for this antiviral state inhibition. Thus, the MYXV dsRNA binding protein M029 not only antagonizes PKR from multiple species but also blocks the type I IFN antiviral state independently of PKR in a highly species‐specific fashion.
The Journal of Surrealism and the Americas: Vol. 1 No. 1 (2007) - Table of Contents
"Introduction to the Journal" by Samantha Kavky, Claudia Mesch, and Amy H. Winter, p. i-iii.
"Anti-Surrealist Cross-Word Puzzles: Breton, Dalí and Print in Wartime America" by Julia Pine, p. 1-29.
"William Carlos Williams’ A Novelette: an American Counterproposal to French Surrealism" by Céline Mansanti, p. 30-43
"The Vernacular as Vanguard: Alfred Barr, Salvador Dalí, and the U.S. Reception of Surrealism in the 1930s" by Sandra Zalman, p. 44-67
"Ben Cobb, Anarchy and Alchemy: The Films of Alejandro Jodorowsky" by David Church, p. 68-71
"Tamayo: A Modern Icon Reinterpreted" by Marta Julia Clapp, p. 72-76
"Robert Desnos, Surrealism, and 'Poetic Politics'" by Terri J. Gordon, p. 77-80
"Dali and the Specter of Cinema" by Frédérique Camille Joseph-Lowery, p. 81-84
"Julia Kelly's Art, Ethnography and the Life of Objects: Paris, c. 1925-1935" by Susan Power, p. 85-90
"The Janus-faced Legacy of Joseph Beuys" by Tatjana Myoko von Prittwitz, p. 91-93
"A.J. Meek, Clarence John Laughlin: Prophet Without Honor" by Jeffrey Ian Ross, p. 94-98
The Journal of Surrealism and the Americas: Vol. 2 No. 1 (2008) - Table of Contents
“Surrealism and Ethnography: Introduction” by Amy H. Winter, p. i-vi.
“Totemic Landscapes and Vanishing Cultures Through the Eyes of Wolfgang Paalen and Kurt Seligmann” by Marie Mauzé, p. 1-24.
“Surrealist Visions of Pre-Columbian Mesoamerica and the Legacy of Colonialism: the Good, the (Revalued) Bad, and the Ugly” by Keith Jordan, p. 25-63.
“Surrealism and Inuit Art: The Fascination of the Far North” by Florence Duchemin-Pelletier, p. 64-94.
“Bound Objects and Blurry Boundaries: Surrealist Display and (Anti)Nationalism” by Susan Power, p. 95-113.
“Man Ray’s Lost and Found Photographs: Arts of the Americas in Context” by Wendy Grossman, p. 114-139.
“T.J. Demos, The Exiles of Marcel Duchamp” by Bradley Bailey, p. 140-144.
“The Dalí Renaissance: New Perspectives on His Life and Art after 1940 and Danser Gala: L’Art Bouffe de Salvador Dalí” by Mary Ann Caws, p. 145-146.
“Review of ‘The Art of Lee Miller’: Victoria and Albert Museum, 2007” by Peter Barberie, p. 147-151.
“Frida Kahlo in Philadelphia: Life and Death” by Samantha Kavky, p. 152-156.
“Thinking the ‘Post-Indian’: Remix: New Modernities in a Post-Indian World” by Claudia Mesch, p. 157-161.
The Journal of Surrealism and the Americas: Vol. 10 No. 1 (2019) - Table of Contents
“Introduction to the Special Issue on Max Ernst” by Samantha Kavky, p. 1-6.
“Napoleon in the Wilderness: The Transmogrification of a Picture by Max Ernst” by Martin Schieder, p. 7-23.
“Seeing Through an (American) Temperament: Max Ernst’s Microbes, 1946-1953” by Danielle M. Johnson, p. 24-45.
“Max Ernst and the Aesthetic of Commercial Tourism: Max Among Some of His Favorite Dolls” by Carolyn Butler Palmer, p, 46-68.
“Arizona Dream: Maxime Rossi Meets Max Ernst” by Julia Drost, p. 69-83.
“Glowing Like Phosphorus: Dorothea Tanning and the Sedona Western” by Catriona McAra, p. 84-105.
“Conference Review: ‘SURREALISMS: the Inaugural Conference of the International Society for the Study of Surrealism’” by Kristen Strange, p. 106-110.
“Exhibition Review of ‘A Home for Surrealism: Fantastic Painting in Midcentury Chicago’” by Jennifer R. Cohen, p. 111-114.
“Exhibition Review: ‘Native American Art at Documenta 14 and the Issue of Democracy’” by Claudia Mesch, p. 115-120.
The Journal of Surrealism and the Americas: Vol. 7 No. 1 (2013) - Table of Contents
“Introduction to the Issue and Special Section on Native American Surrealisms” by Claudia Mesch, p. i-iv.
“George Morrison’s Surrealism” by W. Jackson Rushing III, p. 1-18.
“César Moro’s Transnational Surrealism” by Michele Greet, p. 19-51.
“A Modernist Moment: Native Art and Surrealism at the University of Oklahoma” by Mark A. White, p. 52-70.
“The Opposite of Snake: Surrealism and the Art of Jimmie Durham” by Mary Modeen, p. 71-95.
“‘My World is Surreal,’ or ‘The Northwest Coast’ is Surreal” by Charlotte Townsend-Gault, p. 96-107.
“Complexity and Contradiction in Native American Surrealism” by Robert Silberman, p. 108-130.
“Review of ‘Double Solitaire: The Surreal Worlds of Kay Sage and Yves Tanguy’ & Kay Sage, ‘The Biographical Chronology and Four Surrealist One Act Plays’” by Larry List, p. 131-134.
The Journal of Surrealism and the Americas: Vol. 6 No. 1 (2012) - Table of Contents
“Notes for a Historiography of Surrealism in America, or the Reinterpretation of the Repressed” by Samantha Kavky, p. i-ix.
“What Makes a Collection Surrealist?: Twentieth-Century Cabinets of Curiosities in Paris and Houston” by Katharine Conley, p. 1-23.
“Dalí, Magritte, and Surrealism’s Legacy, New York c. 1965” by Sandra Zalman, p. 24-38.
“‘What Makes Indians Laugh’: Surrealism, Ritual, and Return in Steven Yazzie and Joseph Beuys” by Claudia Mesch, p. 39-60.
“Cracking up an Alligator: Ethnography, Juan Downey’s Videos, and Irony” by Hjorleifur Jonsson, p. 61-86.
“Review of Effie Rentzou, ‘Littérature Malgré Elle: Le Surréalisme et la Transformation du Littéraire’” by Pierre Taminiaux, p. 87-90.
“In Wonderland: the Surrealist Adventures of Women Artists in Mexico and the United States” by Susan L. Aberth, p. 91-94.