Non-reducing SDS-PAGE gel showing purified Dengue virus serotype 4 virus-like particles; envelope protein (E) at approx. 55kDa, and prM protein running at approx. 17-18kDa.

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DENGUE VIRUS SEROTYPE 4 VLP
Dengue Virus Serotype 4 VLP (Virus-Like Particle) is a new, unique product that has been developed in response to the need for highly immunogenic, concentrated Dengue antigens for use in Dengue focussed disease research and vaccine development (including use as an immunogen).
PRODUCT DETAILS – DENGUE VIRUS SEROTYPE 4 VLP
- VLPs are constructed from E, M and preM proteins, with secretion from the cell aided by substituting the C terminal 20% with the corresponding Japanese Encephalitis Virus sequence (all internal/transmembrane).
- Polyprotein amino acids 400-495 produced in HEK293 expression system and tested for stability.
- Concentration and purification by a series of ultracentrifugation and chromatographical methods which result in VLPs of exceptional quality and purity.
- Cleavage of preM protein occurs naturally by furin in the cell and results in a dual population of preM and M-containing VLPs.
BACKGROUND
Virus-Like Particles (VLPs) are an emerging vaccine technology. VLPs consist of protein shells comprising outer proteins specific to the virus in question. VLPs are more representative of how viral antigens are presented in vivo and while they are highly immunogenic they are non-infectious as they lack the core genetic material of the virus. Another important advantage of VLPs is that they more effectively activate key aspects of the immune response to achieve potent immune stimulation and to provide immunological memory. VLP-based vaccines have also shown to provide effective protection and are in current use for several diseases and in development for many others. With more than one-third of the world’s population living in areas at risk of transmission, dengue infection is a leading cause of illness and death in the tropics and subtropics (ref WHO for Guidelines for Diagnosis, Treatment, Prevention & Control, 2009) As many as 100 million people are infected yearly. Dengue is caused by any one of four related viruses transmitted by mosquitoes. There are no vaccines available to prevent infection with dengue virus. Please click here for other serotypes of VLP: Serotype 1, Serotype 2, Serotype 3.
Certificate of AnalysisSafety Datasheet
Publishing research using our reagents? Please let us know so that we can cite your publication as a reference.
1. Metz et al. (2018). Dengue virus-like particles mimic the antigenic properties of the infectious dengue virus envelope. Virol J. 2018 Apr 2;15(1):60 PMID: 29609659
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颗粒型抗原,除了有细菌、红细胞、螺旋体等天然颗粒型抗原,还有吸附有可溶性抗原的非免疫相关颗粒.
颗粒性抗原光镜下可见,比如细菌性抗原、红细胞抗原等;而可溶性抗原在光镜下不可见,如组织浸出液、细菌毒素、蛋白质分子等。
它们不等同于完全抗原和不完全抗原。完全抗原具有免疫原性和抗原性,而不完全抗原只具有抗原性。完全抗原可以是颗粒性抗原,亦可是可溶性抗原,而不完全抗原一般只能是可溶性抗原,不会是颗粒性抗原。
荚膜是某些细菌在细胞壁外包围的一层粘液性物质,一般由糖和多肽组成,是细菌的一种特殊结构。
作用:
①抗吞噬作用:荚膜因其亲水性及其空间占位、屏障作用,可有效抵抗寄主吞噬细胞的吞噬作用。
②黏附作用:荚膜多糖可使细菌彼此间粘连,也可黏附于组织细胞或无生命物体表面,是引起感染的重要因素,具有荚膜的S-型肺炎链球菌毒力强,有助于肺炎链球菌侵染人体;废水生物处理中的细菌荚膜有生物吸附作用,将废水中的有机物、无机物及胶体吸附在细菌体表面上。
③抗有害物质的损伤作用:处于细菌细胞最外层,荚膜犹如盔甲可有效保护菌体免受或少受多种杀菌、抑菌物质的损伤,如溶菌酶、补体等。
④抗干燥作用:荚膜多糖为高度水合分子,含水量在95%以上,可帮助细菌抵抗干燥对生存的威胁。
⑤当缺乏营养时,荚膜可被利用作碳源和能源,有的荚膜还可作氮源。
所以一个细菌或病毒可以有很多的抗原。