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Bioinformatic Approaches To Investigate Hiv Capsid-Nanobody Interaction
(01. Izmir Institute of Technology, 2023) Atik, Şeref Berk; Taşkent Sezgin, Hümeyra; 01. Izmir Institute of Technology
Infection with HIV is still a global pandemic. Since the discovery of this highly mutagenic virus, nearly 40 million people have passed away as a result of HIV-related health problems. Currently, 38.4 million people are HIV-positive. Following infection, the viral genome gets integrated into the host cell genome. The infected person carries the virus for the rest of their life and can spread it to others through bodily fluids. Because there is no treatment for HIV, the World Health Organization recommends that infected people be diagnosed early through comprehensive screening to restrict the virus's spread. As a result, there is still a need to create practical, sensitive diagnostic tools, particularly for use in the field of HIV infection testing. In this study, the interaction between HIV-1 capsid protein, the first antigen found in the blood during the acute phase of HIV infection, and a nanobody (Nb, a single domain antibody) known to bind to capsid is investigated at the molecular level through computational methods. Because the structure of HIV-1 CA binding-Nb is unknown, all-atom models of the Nb structure were constructed using comparative methods, deep-learning-based methods, and hybrid methods (SwissModel, trRosetta, Robetta, AlphaFold2), and promising models were chosen. In the second stage, molecular docking was used to produce HIV-1 capsid- nanobody complex structures, which were then tested for stability and native-likeness using standard molecular dynamics simulations. Understanding the molecular details of the HIV-1 capsid-nanobody complex, we believe, will provide essential data for using this antigen-antibody pair inan immunosensor system for HIV-1 infection diagnosis.
Crude Pectinolytic Enzymes Production in Fed-Batch Shake Flask Cultivation
(01. Izmir Institute of Technology, 2023) Uzuner, Sibel; Uzuner, Sibel; Uzuner, Sibel; Taşkent Sezgin, Hümeyra; 03.08. Department of Food Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
The use of waste in the production of enzymes, which is one of the products with high added value, is one of the right strategies to reduce the production cost of the product and sustainability movement. In this study, the production of polygalacturonase (PGase) and pectin lyase (PLase) enzymes from Bacillus subtilis ATCC 6633 in fed batch submerged fermentation, the conditions and composition of the fermentation medium and the effects of pretreatment methods (thermal, thermo-chemical, microwave assisted dilute acid (MW- DA)) on the conversion of fermentable sugar from black carrot pulp were investigated. The MW-DA was chosen the best with higher fermentable sugar content (FSC). The three different powers (300, 600, 850 W) and 3 different treatment time (30, 60, 90 s) were examined by Taguchi design. The highest FSC was found at 300 Watt for 30 seconds. MW-DA followed by ES produced the most fermentable sugar (0.493 g/g, 87.3% conversion). The amount of fermentable sugar was enhanced from 15.8% to 87.3% when MW-DA treatment is combined with enzymatic saccharification (ES). Yeast extract, whey and pea protein were examined as nitrogen sources. According to the enzyme activity results obtained, the fermentation medium was modified with pea protein. Certain concentrations (2.5%, 5%, 10%, 15%) were fed to the fermentation medium. The highest PGase activity was determined at the 15% feed concentration and 72th hours (164.34±2.26 U/L) whereas the highest PLase activity was obtained at 72th hours (188.22±1.72 U/L) at 5% feed concentration.
Development of a Nucleic Acid-Based Isothermal Diagnostic Test for Border Disease Which Causes Losses in Animal Husbandry
(01. Izmir Institute of Technology, 2022) Meşe Özçivici, Gülistan; Taşkent Sezgin, Hümeyra; Meşe Özçivici, Gülistan; 04.03. Department of Molecular Biology and Genetics; 04. Faculty of Science; 01. Izmir Institute of Technology
Border disease is viral infection of ruminants, and it is associated with abortions, stillbirth, and birth of persistently infected (PI) lambs. It has a great potential to cause an outbreak and it is declared as one of the notifiable diseases of ruminants by World Organization for Animal Health (OIE). Border disease poses a threat against ruminant farming industry by causing major economic losses. Since there is no treatment or vaccine against border disease virus (BDV), early diagnosis and early isolation of infected animals is necessary. RT-qPCR is the gold-standard method for BDV identification, but it can only be applied by trained personnel in a laboratory with expensive instruments. There is a need for a point-of-care (POC) test, specifically designed for BDV. This thesis study aimed to develop a nucleic acid-based loop mediated isothermal amplification (LAMP) technique for BDV identification. LAMP is a nucleic acid identification technique that can be performed using 4-6 primers at a constant temperature with a Bst DNA polymerase. Firstly, multiple alignment of BDV sequences across the world was performed and most conserved region of genome was detected as 5’UTR. Then, three LAMP primer sets 1, 2a and 2b were designed to target 5’UTR. Designed primer sets were optimized in terms of temperature, fluorescent dye, primer mix, Mg2+ and enzyme concentration. After designation of optimum conditions, limit of detection (LOD) was determined for each primer set and their performances were compared. All primer sets have LOD equals to 2x104 copies/μl. Overall, primer set 1 and 2b has higher sensitivity and specificity compared to primer set 2a, therefore they are more suitable to be used for BDV identification with LAMP.

Master Degree / Yüksek Lisans Tezleri

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