At the Hellenic Pasteur Institute the procedure of chromatographic analysis by use of Fast Purification Liquid Chromatographic (FPLC) systems has been implemented. A wide range of resins can be used, including affinity, size-exclusion and ion exchange chromatography. For further analysis of the isolated macromolecules, protein electrophoretic systems are also available.
NTUA is a fully equipped lab in terms of protein isolation and purification. The relative equipment includes a customizable modular purification system (pump, mixer, UV detector and fraction collector), which can be adapted to the desired application. The lab also provides a wide array of diffrent separation resins, including ion exchange chromatography, hydrophobic interactions chromatography, gel filtration chromatography, and affinity chromatography.
Protein electrophoresis systems (both SDS-PAGE electrophoresis and IEF), together with ultrafiltration devices, are also available. Overall, the NTUA lab can fully support users aiming to isolate target proteins from microbial culture supernatants, either from native or heterologous microbial hosts, and provide the suitable equipment and expertise to assess the purity of the resulting protein samples, and their quality for subsequent structural studies.
Fraction collector for protein purification. The ASVANTEC Super Fraction Collector has the ability to collect microliter to liter size fraction directly into a variety of containers. The standard test tube rack,which doubles as an ice bath,can collect up to 120 fractions in test tubes. The SF-2120 has a height adjustment system that allows you to use test tubes or bottles up to 180 mm in height. The self adjusting tapered test tube rack can accommodate test tubes from 12 mm to 18 mm in diameter. Bottles can be organized in the test tube tray and large volumes can be collected using the "Bottle Mode"
Mini-PROTEAN 3 Electrophoresis System, 10 well, 0.75 and 1.50 thickness, complete system includes combs, glass plates, casting stand, casting frames, and Electrophoresis Module
Amicon® Stirred Cells
Pressure-based sample concentration
Amicon® stirred cells are ideal for finely separating macrosolutes (DNA, RNA, protein, etc.) in large-volume (400 mL) samples. They are also reliable tools for membrane analysis, because they allow users to insert membranes of choice. Stirred cells concentrate solutions with up to 10% initial macrosolute concentration with high flow rates and high recovery. They can be also used for salt removal followed by concentration in the same unit, and complete product recoveries can generally be achieved.
Gentle magnetic stirring minimizes concentration polarization and shear denaturation. All stirred cells can be autoclaved.
Peristaltic pump and mixer for up to two solvents gradient. Manual and programmed operation.
The Model EM-1 Econo UV monitor is a single-wavelength detector for flowthrough monitoring of effluents from chromatographic columns, centrifugation gradients, and other devices. The monitor consists of a control unit and an optics module that includes both 254 and 280 nm filters and a 2 mm pathlength flow cell. Connection is via Luer-Lok fittings for quick, easy changes. Key features include:
Portable optics module with detection close to the column outlet to maximize resolution
Self-contained filters
Autozeroing function
Coldroom compatibility
LED display of absorbance
Visit the provider's website: http://inspired.aua.gr/instruct/
Chromatography system for Protein purification
Akta purifier from GE Healthcare is used for the protein purification with simple column selection. Its features are:
Automatic titration of buffers across a broad pH range
Quick and easy transfer of methods to production-scale
UNICORN method wizard High performance purification and characterization
State-of-the-art computer-controlled pumps, UV/conductance monitors, and fraction collector
UV-Vis detection of up to three wavelengths simultaneous
Dr. Anastasia Zerva, Biologist, MSc, PhD in Chemical Engineering, is an expert in the use of microbiology methods for submerged batch cultures and bioreactors, but also molecular biology tools for production of biotechnologically relevant enzymes in heterologous hosts. She has experience in methods of isolation, purification and biochemical characterization of enzymes. Moreover, her area of research includes methods of isolation of bioactive compounds from mycelial biomass and culture filtrates.
Fraction collector for protein purification. The ASVANTEC Super Fraction Collector has the ability to collect microliter to liter size fraction directly into a variety of containers. The standard test tube rack,which doubles as an ice bath,can collect up to 120 fractions in test tubes. The SF-2120 has a height adjustment system that allows you to use test tubes or bottles up to 180 mm in height. The self adjusting tapered test tube rack can accommodate test tubes from 12 mm to 18 mm in diameter. Bottles can be organized in the test tube tray and large volumes can be collected using the "Bottle Mode"
Mini-PROTEAN 3 Electrophoresis System, 10 well, 0.75 and 1.50 thickness, complete system includes combs, glass plates, casting stand, casting frames, and Electrophoresis Module
Amicon® Stirred Cells
Pressure-based sample concentration
Amicon® stirred cells are ideal for finely separating macrosolutes (DNA, RNA, protein, etc.) in large-volume (400 mL) samples. They are also reliable tools for membrane analysis, because they allow users to insert membranes of choice. Stirred cells concentrate solutions with up to 10% initial macrosolute concentration with high flow rates and high recovery. They can be also used for salt removal followed by concentration in the same unit, and complete product recoveries can generally be achieved.
Gentle magnetic stirring minimizes concentration polarization and shear denaturation. All stirred cells can be autoclaved.
Peristaltic pump and mixer for up to two solvents gradient. Manual and programmed operation.
The Model EM-1 Econo UV monitor is a single-wavelength detector for flowthrough monitoring of effluents from chromatographic columns, centrifugation gradients, and other devices. The monitor consists of a control unit and an optics module that includes both 254 and 280 nm filters and a 2 mm pathlength flow cell. Connection is via Luer-Lok fittings for quick, easy changes. Key features include:
Portable optics module with detection close to the column outlet to maximize resolution
Self-contained filters
Autozeroing function
Coldroom compatibility
LED display of absorbance
Professor Elias Eliopoulos is the Director of the Genetics Laboratory at the Biotechnology Department of the Agricultural University of Athens (A.U.A.) and leads the bioinformatics and structural biology group. He is professor of Biochemistry, a biophysicist and crystallographer by training with considerable experience in biomolecular structure analysis, epitope mapping of protein receptors, genetic polymorphisms and variation, cloning, with experimental and computational methods, protein structure prediction, ligand and drug design, protein design, in silico antibody design and biosoftware development. The group has experience and international reputation on computational protein folding, ab initio and homology modeling of proteins derived from edge gene research and membrane protein modeling. The group is also involved in many ligand computational design projects for pharmaceutical, medicinal and agricultural applications.
Chromatography system for Protein purification
Dr. Stathis Frillingos is Professor of Biological Chemistry at the University of Ioannina, Department of Medicine, and Director of the Interinstitutional Interdepartmental Programme of Postgraduate Studies in Molecular and Cellular Biology and Biotechnology at the University of Ioannina, Greece (http://msc-mcbb.ac.uoi.gr). His research team focuses on the analysis of structure-function-specificity and evolutionary relationships of membrane transporters, with current emphasis on Solute Carriers responsible for the transmembrane transport of nucleosides, nucleobases and their antimetabolite analogs. His research studies include the functional characterization of new nucleobase/nucleoside transporters from microorganisms and analysis of their binding-site interactions with inhibitors and antimetabolite compounds as potential antimicrobial drugs (http://www.frillingoslab.gr).
Dr. Vassilis Douris is Assistant Professor of Molecular Biology at the University of Ioannina, Department of Biological Applications and Technology. His research team focuses on the analysis of synergistic interactions between molecular mechanisms of insecticide resistance using reverse genetics (CRISPR/Cas9) approaches and functional expression in Drosophila and insect cell-based models, with current emphasis on the potential role of insect chemosensory proteins in insecticide detoxification. His research includes the functional characterization of resistance mutations and detox genes from resistant insects and their employment towards generation of screening platforms for inhibitory compounds to be used as potential synergists (https://www.bri.forth.gr/douris).
Stratos Mylonas studied at the Molecular Biology and Genetics Department at the Democritus University of Thrace in Alexandroupolis and conducted his BSc thesis research at the Immunology lab of Prof. Chris D. Platsoucas at the Temple University of Philadelphia. He was accepted at the EMBL International PhD program and joined the lab of Dr. Dmitri Svergun at EMBL Hamburg, Germany focusing on method development and structural analysis of flexible proteins using Small Angle Scattering. After his PhD, he joined the lab of Dr Naoto Yagi at Spring-8, JASRI, Japan working on the structural analysis and simulations of surfactant assemblies, as potential gene delivery systems, and DNA polypods working mostly in collaboration with the group of Prof. Kazuo Sakurai at the University of Kitakyushu. He, then, worked at the lab of Prof. Michael Kokkinidis at IMBB-FORTH in Heraklion, Crete and was involved in several projects including a protein folding model protein, designing enzymes with new specificities, non-coding RNAs and bacterial Type III Secretion Systems. He will soon join the Department of Chemistry at University of Ioannina as an Assistant Professor of Biochemistry. He is interested in the structural analysis of biological macromolecules, combining information from experimental and computational methods for the better understanding of structure-function relations.
EDUCATION
2019: PhD in Structural Biology and Protein Biomaterials (UoC, IMBB-FORTH - Greece)
2012: M.Sc. in Protein Biotechnology (UoC-Greece)
2009: Diploma Degree in Biology (UoC-Greece)
WORKING EXPERIENCE
Oct 2019 – Now: Post-Doctoral Researcher at I.M.B.B.-F.O.R.TH, Greece
(Laboratory of Structural Biology)
Sep 2020 – Now: Autonomous teaching and exam organizing of the under-graduate courses
"Enzymatic Biotechnology" and “Protein Engineering” at the Dept. of
Biology of the Uni. of Crete
2014 – 2020: Experienced scientist position at I.M.B.B.-F.O.R.TH, Greece (InnovCrete project /FP7-Regpot program) and at University of Crete
Oct. 2010 –Jan. 2011: Laboratory Teaching Assistant of Microbiology Teaching Lab
at the Dept. of Biology, Uni. of Crete
SELECTED PUBLICATIONS
*Kefala K., Kotsifaki D., Providaki M., Kapetaniou E., Rahme L. and Kokkinidis M. Purification, crystallization and preliminary X-ray diffraction analysis of the C-terminal fragment of the MvfR protein of Pseudomonas aeruginosa. (2012). Acta. Cryst F, 68, 695-697
*Kefala A., Kotsifaki D., Providaki M., Amprazi M. and Kokkinidis M. Expression, purification and crystallization of a protein resulting from the inversion of the aminoacid sequence of a helical bundle. (2017). ). Acta. Cryst F, 73, 51-53
Dimovasili C., Fadouloglou V.E., Kefala A., Providaki M., Kotsifaki D, Sarrou I., Plaitakis A., Zaganas I. and Kokkinidis M. Crystal structure of glutamate dehydrogenase 2, a positively selected novel human enzyme involved in brain biology and cancer pathophysiology. Journal of Neurochemistry (accepted)
RESEARCH PROFILE
Being in a Structural Biology group since 2011, Dr. Kefala A. has studied deeply the protein folding problem, elucidating the relation between amino acid sequence and structural properties of α-helical bundles. The knowledge obtained was used for protein design leading to bio-derived materials for bio-medical applications and basic research through structural studies of protein folding through reverse sequences.
Notable achievements include:
The elucidation of the protein folding of mutants of the α-helical protein Rop that is used as a canonical paradigm of this structural motif.
Protein design of novel protein-based biomaterials with specific engineered properties.