Abstract:
:Glycodendrimers are relatively novel synthetic biomacromolecules that are made of biologically relevant carbohydrate ligands constructed at the periphery of a wide range of highly functionalized and repetitive scaffolds having varied molecular weights and structures. They were aimed to fill the gap between glycopolymers, having generally dispersed higher molecular weight, and small glycoclusters, in the study of multivalent carbohydrate protein interactions. In a way, glycodendrimers, with their spheroidal or dendritic (wedge) type structures, were initially designed as bioisosteres of cell surface multiantennary glycans. Taken as a curiosity and elegant molecules at their beginning, they are now considered as potent inhibitors of microbial adhesins. They have also been shown to play some roles in signal transduction and in receptor cross-linking. This brief report will describe advances that have been made toward the syntheses of a range of glycodendrimers bearing the immunodominant T-antigen disaccharide [beta-D-Gal-(1-3)-alpha-D-GalNAc] found on malignant cells of carcinomas, particularly related to breast cancer. This antigen, usually cryptic on healthy tissues, is greatly increased on cancer cells as a result of aberrant glycosylation. It is considered to be an important cancer marker. The high incidence of these carcinomas to invade other tissues such as lymph nodes, lung, and liver by metastasis was one of the arguments raised to generate T-antigen dendrimers that might have the potential to block the receptor sites following surgery. The synthesis of the T-antigen disaccharide will be briefly described, followed by the elaboration of neoglycoproteins and glycopolymers used to raise monoclonal antibodies against the T-antigen and for screening purpose, respectively. Scaffolds made of poly(amidoamine) (PAMAM), poly(propylene imine), N,N'-bis(acrylamido)acetic acid, and finally hyperbranched L-lysine were used to construct relatively small glycodendrimers bearing T-antigen moieties. Few glycodendrimers were also linked to fluorescein and biotin probes to generate ligands that can be used to detect T-Ag receptor sites.
journal_name
J Biotechnoljournal_title
Journal of biotechnologyauthors
Roy R,Baek MGdoi
10.1016/s1389-0352(01)00065-4subject
Has Abstractpub_date
2002-05-01 00:00:00pages
291-309issue
3-4eissn
0168-1656issn
1873-4863pii
S1389-0352(01)00065-4journal_volume
90pub_type
杂志文章,评审abstract::Herbinix hemicellulosilytica is a newly isolated, gram-positive, anaerobic bacterium with extensive hemicellulose-degrading capabilities obtained from a thermophilic biogas reactor. In order to exploit its potential as a source for new industrial arabinoxylan-degrading enzymes, six new thermophilic xylanases, four fro...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2017.04.023
更新日期:2017-09-10 00:00:00
abstract::One important question in microbiome analysis is how to assess the homogeneity of the microbial composition in a given environment, with respect to a given analysis method. Do different microbial samples taken from the same environment follow the same taxonomic distribution of organisms, or the same distribution of fu...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2016.10.020
更新日期:2017-05-20 00:00:00
abstract::During the course of a lifetime, it has been calculated that we may consume between 100 and 700 tons of food. For the average British citizen, this is likely to include some 550 poultry, 36 pigs, 36 sheep, eight oxen, 10000 eggs and dairy products (milk, butter cheese, etc.) equivalent to 18 tonnes of milk. As if that...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/s0168-1656(00)00299-6
更新日期:2000-09-29 00:00:00
abstract::The large scale production of a monoclonal anti-progesterone antibody in serum free medium followed by affinity chromatography on protein G lead to a contamination of the antibody sample with a protein of about 14 kDa. This protein was identified by mass spectrometry as secretory leukocyte protease inhibitor (SLPI). T...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2011.12.025
更新日期:2012-03-31 00:00:00
abstract::Streptomyces lividans TK24 is the standard host for the heterologous expression of a number of different proteins and antibiotic-synthesizing enzymes. As such, it is often used as an experimental microbial cell factory for the production of secreted heterologous proteins including human cytokines and industrial enzyme...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2015.02.004
更新日期:2015-04-10 00:00:00
abstract::Amatoxins are ribosomally synthesized and post-translationally modified peptides (RiPPs) found in poisonous mushrooms. These cyclic peptides are potent inhibitors of RNA polymerase II transcriptional activity. Though the macrocyclization of amatoxin is extensively studied, little is known about its subsequent post-tra...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2019.12.004
更新日期:2020-01-20 00:00:00
abstract::The current validated endotoxin detection methods, in spite of being highly sensitive, present several drawbacks in terms of reproducibility, handling and cost. Therefore novel approaches are being carried out in the scientific community to overcome these difficulties. Remarkable efforts are focused on the development...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.06.018
更新日期:2014-09-30 00:00:00
abstract::This work explores the role of one of the factors explaining lipase/esterase activity: the contribution of electrostatic interactions to lipase/esterase activity. The electrostatic potential distribution on the molecular surface of an enzyme as a function of pH determines, to a large extent, the enzyme's pH activity p...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(00)00360-6
更新日期:2001-02-13 00:00:00
abstract::Poly-l-cysteine (PLCys) is drawing attention as a potential sorbent of thiol (SH)-reactive toxic heavy metal ions in the wastewater and polluted soils. However, preparation of PLCys relies on chemically synthesized polymers, in which SH groups must be protected and deprotected prior to use. On the other hand, α-chymot...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2011.12.021
更新日期:2012-02-10 00:00:00
abstract::The expression of heterologous proteins in microorganisms using genetic recombination is still the high point in the development and exploitation of modern biotechnology. People can produce bioactive proteins from relatively cheap culture medium instead of expensive extraction. Host cell systems for the expression of ...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/j.jbiotec.2006.07.012
更新日期:2007-01-10 00:00:00
abstract::Vacuolar sequestration of valuable secondary metabolites remains the major limitation to the use of immobilization technology for large scale plant-cell-based bioprocesses, which otherwise may be a more efficient culture system than suspension for this biomass. In this initial study, the release of indole alkaloids pr...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/0168-1656(91)90260-3
更新日期:1991-11-01 00:00:00
abstract::Protein modifications by intricate cellular machineries often redesign the structure and function of existing proteins to impact biological networks. Disulfide bond formation between cysteine (Cys) pairs is one of the most common modifications found in extracellularly-destined proteins, key to maintaining protein stru...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2017.03.006
更新日期:2017-04-20 00:00:00
abstract::The circadian clock schedules processes in microalgae cells at suitable times in the day/night cycle. To gain knowledge about these biological time schedules, Neochloris oleoabundans was grown under constant light conditions and nitrogen limitation. Under these constant conditions, the only variable was the circadian ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.07.016
更新日期:2014-10-10 00:00:00
abstract::A novel methodology based on analysis of mtDNA-cytb diagnostic sites was performed to discriminate four closely related species of Thunnus (Thunnus alalunga, Thunnus albacares, Thunnus obesus and Thunnus thynnus) and one species of Euthynnus (Katsuwonus pelamis) genus in raw and canned tuna. The primers used in the pr...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2007.01.032
更新日期:2007-05-01 00:00:00
abstract::Early development datasets are typically unstructured, incomplete and truncated, yet they are readily available and contain relevant process information which is not extracted using classical data analysis techniques. In this paper, we illustrate the power of multivariate data analysis (MVDA) as a Process Analytical T...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.07.006
更新日期:2013-09-10 00:00:00
abstract::Enzyme engineering by molecular modelling and site-directed mutagenesis can be remarkably efficient. Directed enzyme evolution appears as a more general strategy for the isolation of catalysts as it can be applied to most chemical reactions in aqueous solutions. Selections, as opposed to screening, allow the simultane...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/j.jbiotec.2004.03.032
更新日期:2004-09-30 00:00:00
abstract::Experiments in the life sciences often involve tools from a variety of domains such as mass spectrometry, next generation sequencing, or image processing. Passing the data between those tools often involves complex scripts for controlling data flow, data transformation, and statistical analysis. Such scripts are not o...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/j.jbiotec.2017.07.028
更新日期:2017-11-10 00:00:00
abstract::Semi-synthetic β-lactam antibiotics (SSBAs) are one of the most important antibiotic families in the world market. Their enzymatic synthesis can be catalyzed by penicillin G acylases (PGAs). In this study, to improve enzymatic synthesis of ampicillin, site-saturating mutagenesis was performed on three conserved amino ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2015.01.004
更新日期:2015-04-10 00:00:00
abstract::In this paper, we report the chromium(VI) reduction by filtrates of Acidithiobacillus and Thiobacillus cultures. Chromium(VI) reduction by filtrates of A. ferrooxidans cultures under acidic conditions was higher than that observed for A. thiooxidans. However, at pH close to 7, chromium(VI) reduction by filtrates of T....
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.08.031
更新日期:2006-03-09 00:00:00
abstract::Flow cytometry has been used to study the mechanisms of damage to mammalian cells by hydrodynamic forces. Cell damage resulted from the stresses created both by bubble entrainment and by bubble bursting caused by vortex formation in highly agitated culture. Damage to the antigen molecules on the cell surface together ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/0168-1656(93)90158-j
更新日期:1993-11-01 00:00:00
abstract::Batch bioreactor cultivations using Saccharomyces cerevisiae at high (190-305 gl(-1) glucose) or low (21-25 gl(-1) glucose) gravity conditions were monitored on-line using multi-wavelength fluorescence (MWF) and standard monitoring sensors. Partial least squares models were calibrated for the prediction of cell dry we...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.08.018
更新日期:2009-10-26 00:00:00
abstract::A new, chemically defined medium providing dispersed growth and high biomass formation and a method for quantitative extraction of intracellular metabolites was used to investigate the cellular response of Streptomyces coelicolor A3(2) during growth and upon changes in nutrient utilization. Fast changes of the glucose...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(99)00215-1
更新日期:2000-02-17 00:00:00
abstract::The development of SIN-lentivectors has paved the way for the double copy vectors (DCV), which substitute the deletion in the 3'LTR with either transgenic or insulator sequences. However, the limits of this approach remain unclear. Previous results have demonstrated that transduction efficiencies of DCV carrying large...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2010.07.010
更新日期:2010-10-01 00:00:00
abstract::This review is aimed at biochemists and molecular biologists, and covers the chemistry and key features involved in the solid-phase synthesis of a variety of the better known DNA and RNA analogues by the phosphoramidite and H-phosphonate methods. A wide spectrum of biological applications such as inhibition of gene ex...
journal_title:Journal of biotechnology
pub_type: 杂志文章,评审
doi:10.1016/0168-1656(95)00012-f
更新日期:1995-07-31 00:00:00
abstract::The feed profile of glucose during fedbatch cultivation could be used to influence the retention of the periplasmic product ZZ-cutinase. An increased feed rate led to a higher production rate but also to an increased specific leakage, which reduced the periplasmic retention. Three growth rates: 0.3, 0.2 and 0.1 h(-1) ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.05.002
更新日期:2008-07-31 00:00:00
abstract::The PRNP gene encodes a cellular protein named prion, whose misfolded form has been implicated in a number of neuropathic diseases in mammals such as the Bovine Spongiform Encephalopathy (BSE) in cattle. BSE has brought devastating impact on the world economy and human health. Recently, several groups have performed t...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.10.018
更新日期:2013-02-20 00:00:00
abstract::beta-galactosidase reporter plasmids containing different viral or minimal promoters are commonly used to correct variable transfection efficiencies in transient transfection experiments. The transcriptional activity of these promoters is thought to be stable under most circumstances. To determine if expression of bet...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(01)00277-2
更新日期:2001-07-12 00:00:00
abstract::N-Acetylneuraminic acid, an important component of glycoconjugates with various biological functions, can be produced from N-acetyl-D-glucosamine (GlcNAc) and pyruvate using a one-pot, two-enzyme system consisting of N-acyl-D-glucosamine 2-epimerase (AGE) and N-acetylneuraminate lyase (NAL). In this system, the epimer...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.07.003
更新日期:2013-11-01 00:00:00
abstract::Chinese hamster ovary (CHO) cells are widely used for the production of biopharmaceuticals; however, our understanding of several physiological elements that contribute to productivity is limited. One of these is amino acid transport and how its limitation and/or regulation might affect productivity. To further our un...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2013.09.007
更新日期:2013-12-01 00:00:00
abstract::Escherichia coli strain BL21(DE3) was tested as a delivery vector for gene transfer to a murine P388D1 macrophage cell line using a 96-well high-throughput assay. Five recombinant strains of E. coli were compared to identify the effect recombinant listeriolysin O (LLO) and associated gene expression parameters had on ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.07.1815
更新日期:2008-10-10 00:00:00