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May 16th, 2017
Dual Plug-and-Display Synthetic Assembly Using Orthogonal Reactive Proteins for Twin Antigen Immunization
Brune KD, Buldun CM, Li Y, Taylor IJ, Brod F, Biswas S, Howarth M.

Engineering modular platforms to control biomolecular architecture can advance both the understanding and the manipulation of biological systems. Icosahedral particles uniformly displaying single antigens stimulate potent immune activation and have been successful in various licensed vaccines. However, it remains challenging to display multiple antigens on a single particle and to induce broader immunity protective across strains or even against distinct diseases. Here, we design a dually addressable synthetic nanoparticle by engineering the multimerizing coiled-coil IMX313 and two orthogonally reactive split proteins. SpyCatcher protein forms an isopeptide bond with SpyTag peptide through spontaneous amidation. SnoopCatcher forms an isopeptide bond with SnoopTag peptide through transamidation. SpyCatcher-IMX-SnoopCatcher provides a modular platform, whereby SpyTag-antigen and SnoopTag-antigen can be multimerized on opposite faces of the particle simply upon mixing. We demonstrate efficient derivatization of the platform with model proteins and complex pathogen-derived antigens. SpyCatcher-IMX-SnoopCatcher was expressed in Escherichia coli and was resilient to lyophilization or extreme temperatures. For the next generation of malaria vaccines, blocking the transmission of the parasite from human to mosquito is an important goal. SpyCatcher-IMX-SnoopCatcher multimerization of the leading transmission-blocking antigens Pfs25 and Pfs28 greatly enhanced the antibody response to both antigens in comparison to the monomeric proteins. This dual plug-and-display architecture should help to accelerate vaccine development for malaria and other diseases.

doi: 10.1021/acs.bioconjchem.7b00174
Bioconjug Chem. 2017 May 5.
May 5th, 2017
The Growing Threat of Pandemics: Enhancing Domestic and International Biosecurity
A Scowcroft Institute of International Affairs White Paper

The threat posed by pandemics grows alongside increased globalization and technological innovation. Distant cultures can now be connected in a day’s time, and international trade links global health and economic prosperity. This report details nine priority areas and accompanying action items that will help to address current pandemic response problems.

Developing centralized leadership; coordinating existing agencies and departments; reforming WHO; and providing adequate funding to establish sufficient supplies, infrastructure, expertise ,and institutions are paramount to success in pandemic response.

The reports stresses that Foreign aid for global health and related investments has never been more important to international security and US national security

The Bush school of government and public services
Jan 13th, 2017
The N-terminal domain of Schmallenberg virus envelope protein Gc is highly immunogenic and can provide protection from infection
Kerstin Wernike, Andrea Aebischer, Gleyder Roman-Sosa & Martin Beer

Schmallenberg virus (SBV) is transmitted by insect vectors, and therefore vaccination is one of the most important tools of disease control. In our study, novel subunit vaccines on the basis of an amino-terminal domain of SBV Gc of 234 amino acids (“Gc Amino”) first were tested and selected using a lethal small animal challenge model and then the best performing formulations also were tested in cattle. We could show that neither E. coli expressed nor the reduced form of “Gc Amino” protected from SBV infection. In contrast, both, immunization with “Gc Amino”-encoding DNA plasmids and “Gc-amino” expressed in a mammalian system, conferred protection in up to 66% of the animals. Interestingly, the best performance was achieved with a multivalent antigen containing the covalently linked Gc domains of both, SBV and the related Akabane virus. All vaccinated cattle and mice were fully protected against SBV challenge infection. Furthermore, in the absence of antibodies against the viral N-protein, differentiation between vaccinated and field-infected animals allows an SBV marker vaccination concept. Moreover, the presented vaccine design also could be tested for other members of the Simbu serogroup and might allow the inclusion of additional immunogenic domains.

Nature Scientific Reports 7, Article number: 42500 (2017)


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