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(New page: I based my assignment on this research: [https://www.researchgate.net/publication/320270906_A_synthetic_biology_approach_to_transform_Yarrowia_lipolytica_into_a_competitive_biotechnologica...)
 
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I based my assignment on this research: [https://www.researchgate.net/publication/320270906_A_synthetic_biology_approach_to_transform_Yarrowia_lipolytica_into_a_competitive_biotechnological_producer_of_b-carotene_Production_of_b-carotene_in_Y_lipolytica]
=UVOD=
VBI Vaccines Inc. je biofarmacevtsko podjetje, ki ga poganja imunologija in si prizadeva za močno preprečevanje in zdravljenje bolezni. S svojim inovativnim pristopom k virusom podobnim delcem ("VLP"), vključno s tehnologijo platforme VLP ("eVLP"), VBI razvija kandidate za cepiva, ki posnemajo naravno predstavitev virusov, namenjene izvabljanju prirojene moči človeškega imunskega sistema. 


'''A SYNTHETIC BIOLOGY APPROACH TO TRANSFORM YARROWIA LYPOLYTICA INTO A COMPETITIVE BIOTECHNOLOGICAL PRODUCER OF β-CAROTENE'''
=KAJ JE VBI-2902a CEPIVO=
VBI-2902a je kandidat za preskusno cepivo, ki uporablja ekspresijo virusnih podobnih delcev modificirano verzijo glikoproteina spike SARS-CoV-2 in je zasnovan tako, da inducira nevtralizirajoča protitelesa in imunski odziv, ki ga povzročajo celice, proti SARS-CoV-2 spike proteinu. VBI-2902a z vsebnostjo do 10 μg proteinov in dodatkom aluminijevega fosfata se daje z intramuskularno injekcijo.


'''1.''' [[INTRODUCTION]]
=KLINIČNE ŠTUDIJE=
β-carotene is an orange pigment and a well-known precursor of vitamin A. It is a biochemical synthesized terpenoid and is added to the group of carotenoids- β-carotene can be produced either chemically or biotechnologically, extracting it from the natural producer of  microorganisms such as Blakeslea trispora. Yarrowia lipolytica is an oleaginous yeast greatly investigated and modified, for the sake of production of biotechnologically relevant compounds.  
Študija faze 1/2 bo ovrednotila varnost, prenašanje in imunogenost zdravila VBI-2902a v režimu  enega in dveh odmerkov ter dve ravni odmerka (5 μg in 10 μg spike proteina) v primerjavi s placebom (fiziološka raztopina) pri zdravih odrasli, stari 18 let ali več. Število udeležencev je 780.  


'''2.''' [[THEORETICAL FRAMEWORK]]
Začetna študija faze 1/2 VBI-2902a, se je začela 15. marca 2021 in naj bi bila končana junija 2022.
            '''2.1''' ''MATERIALS AND METHODS – STRAINS AND MEDIA'' 
The materials and methods are divided into a series of steps, intended to create a producer of β-carotene out of the aforementioned yeast, Yarrowia lipolytica. The needest steps are: 1) strain construction, 2) construction of the DNA, 3) β-carotene measurement, 4) developing microscopy images, 5) lipid content quantification, 6) biomass, sugar and acid quantification and lastly come the 7) bioreactor procedures.


'''3.''' [[RESULTS AND DISCUSSION]]
=LITERATURA=
            ''' 3.1''' ''Lipid overproducer strain synthesizes higher amount of β-carotene''
[1] Jeff Baxter, CEO; David E. Anderson, CSO Preclinical Coronavirus Program Data (https://1o976r1jw2eculmeoxz46ig6-wpengine.netdna-ssl.com/wp-content/uploads/2020/08/August-2020-VBI-2900-Preclinical-Data-Announcement_Final.pdf)
Previous set of reports documented that the overexpression of three genes (geranylgeranyl diphosphate synthase (GGS1), pytoene synthase/lycopene cyclase and phytoene dehydrogenase) promote and increase the production of β-carotene in Y. lipolytica. The reseachers used an expression cassette (a car-cassette), where the expression of the GGS1 is controlled by the promoter PGMp. The sole expression, within the cassette itself (in the parental strain) allows a production of a  substantial amount of β-carotene.


          ''' 3.2''' ''Continuous metabolic engineering magnifies carotene content''
[2] Anne-Catherine Fluckiger,  Barthelemy Ontsouka, Jasminka Bozic, Abebaw Diress, Tanvir Ahmed, Tamara Berthoud, Anh Tran, Diane Duque, Mingmin Liao, Michael McCluskie, Francisco Diaz-Mitoma, David E. Anderson, Catalina Soare, “An enveloped virus-like particle vaccine expressing a stabilized prefusion form of the SARS-CoV-2 spike protein elicits potent immunity after a single dose” bioRxiv, 28.4.2021 (https://www.biorxiv.org/content/10.1101/2021.04.28.441832v1.full)
In order to enhance the production of caroteonids, the overexpression of HMG1 (hydroxymethylglutaryl-CoA reductase) is well known. In order to enhance the production of β-carotene, they overexpressed the gene YALI0E04807. It was done under the control of the constitutive TEF promoter in the strain of ob-C. The generated strain (ob-CH) enhanced the production β-carotene by a substantial amount.


            '''3.3''' ''Identifying the best promoter set for the production of β-carotene''
[3] VBI-2902 – Wikipedia https://en.wikipedia.org/wiki/VBI-2902 (pridobljeno 5. 5. 2021)
The increase in promoter strength can enchance the transcription level more than five times. They use the Closing Gate cloning system in promoter shuffling. This strategy consists in a digestion-ligation reaction guided by Bsal defined sites where the three promotors can be introduced and guided within the promotor positions in the car-cassettes. The pool of cassettes were then set for transformation, the wild type parental strains enable the screening of different colour intensity. Once they finished the transformation, they obtained 387 colonies. By analyzing the overall combination of promoters, the presence of a strong TEF promoter is favoured as it stood in the second position of the car-cassette.  


              '''3.4''' ''The construction of the β-carotene overproducer strain''
[4] VBIVACCINE – VBI Vaccines Announces Publication of Preclinical and Challenge Study Data of its eVLP Vaccine Candidate Against COVID-19 (VBI-2902)
Seeing as how an extra copy of the car-cassette in the strain ob-CH increased the production of β-carotene greatly, the cassette was optimized by a set of promoters and as a result there became: carTEF-cassette. By expressing the carTEF-cassette in the strain ob-CH, the production of β-carotene was increased. Moreover, an extra copy of the carTEF-cassette was brought to construct the strain ob-CHCTEFCTEF . Said strain was able to also enhance the production of β-carotene.  
April 28, 2021 https://www.vbivaccines.com/press-releases/vbi-2902-preclinical-and-challenge-study-data/ (pridobljeno 6. 5. 2021)


              '''3.5''' ''A trade off between production titer and yield''
[5] VBIVACCINE - VBI Vaccines Announces Preclinical Coronavirus Program Data and Selection of Clinical Candidates with Potential as One-Dose Vaccines https://www.vbivaccines.com/press-releases/preclinical-coronavirus-data-candidate-selection/ (pridobljeno: 7. 5. 2021)
Two different kinds of media were tested, rich media (YPD) and synthetic media (YNB). A higher concentration of the carbon/nitrogen ratio is known to increase lipid production and by that, it enhances the production of carotenoids. Glucose and glycerol were tested as the first carbon source. The selected media were YPD10, YPD60, YNB20, YNB30, YNB60, and YNBGLY60. They concluded that there wasn't much of an influence on the carbon source since glucose and glycerol showed similar between both titer and yields. The best β-carotene titer so far was found in YPD60, whilst the winning yield is YPD10.  


            ''' 3.6''' ''Boosting β-carotene production by the engineered strain ob-CHCTEFCTEF''
[6] VBI-2902a - ClinicalTrials.gov, Safety, Tolerability, and Immunogenicity of the COVID-19 Vaccine Candidate (VBI-2902a) https://clinicaltrials.gov/ct2/show/NCT04773665 (pridobljeno: 7. 5. 2021)
With the performation of fed-batch fermantation using a rich media (Y10P20D), they added glucose. The glucose concentration began to rise due to the lack of consumption. The strain led to a production of β-carotene and citric acid. Designing a culture media with the double amount of yeast extract and peptone (Y20P40D), they optimized bioreactor conditions. The results show that Y. lipolytica engineered using synthetic biology and metabolic engineering is a potential industrial producer of β-carotene.
 
'''4.''' [[CONCLUSION]]
With the combination of  traditional metabollic engineering strategies and synthetic biology tools, it's been proven that Y. lipolytica serve as a valid production source for β-carotene. The increase of gene copy numbers and lipogenesis with the use of favourable promoters massively enhanced the production of β-carotene and also, the fed-batch fermentation was proven as the best pathway in generating β-carotene.  
The process can also be further improved not only by engineering strains and bioreactor condition optimization but also by the use of low cost carbon sources. The selection of suitable microorganism and strains plays a great role in electing a more successful source of production of β-carotene. The rapid development of synthetic biology tools for genome editing and DNA assembly is alleviating the manipulation of non-conventional organisms, growing the range of biotechnological „vehicles“ for metabolic engineering.

Latest revision as of 09:44, 7 May 2021

UVOD

VBI Vaccines Inc. je biofarmacevtsko podjetje, ki ga poganja imunologija in si prizadeva za močno preprečevanje in zdravljenje bolezni. S svojim inovativnim pristopom k virusom podobnim delcem ("VLP"), vključno s tehnologijo platforme VLP ("eVLP"), VBI razvija kandidate za cepiva, ki posnemajo naravno predstavitev virusov, namenjene izvabljanju prirojene moči človeškega imunskega sistema.

KAJ JE VBI-2902a CEPIVO

VBI-2902a je kandidat za preskusno cepivo, ki uporablja ekspresijo virusnih podobnih delcev modificirano verzijo glikoproteina spike SARS-CoV-2 in je zasnovan tako, da inducira nevtralizirajoča protitelesa in imunski odziv, ki ga povzročajo celice, proti SARS-CoV-2 spike proteinu. VBI-2902a z vsebnostjo do 10 μg proteinov in dodatkom aluminijevega fosfata se daje z intramuskularno injekcijo.

KLINIČNE ŠTUDIJE

Študija faze 1/2 bo ovrednotila varnost, prenašanje in imunogenost zdravila VBI-2902a v režimu enega in dveh odmerkov ter dve ravni odmerka (5 μg in 10 μg spike proteina) v primerjavi s placebom (fiziološka raztopina) pri zdravih odrasli, stari 18 let ali več. Število udeležencev je 780.

Začetna študija faze 1/2 VBI-2902a, se je začela 15. marca 2021 in naj bi bila končana junija 2022.

LITERATURA

[1] Jeff Baxter, CEO; David E. Anderson, CSO Preclinical Coronavirus Program Data (https://1o976r1jw2eculmeoxz46ig6-wpengine.netdna-ssl.com/wp-content/uploads/2020/08/August-2020-VBI-2900-Preclinical-Data-Announcement_Final.pdf)

[2] Anne-Catherine Fluckiger, Barthelemy Ontsouka, Jasminka Bozic, Abebaw Diress, Tanvir Ahmed, Tamara Berthoud, Anh Tran, Diane Duque, Mingmin Liao, Michael McCluskie, Francisco Diaz-Mitoma, David E. Anderson, Catalina Soare, “An enveloped virus-like particle vaccine expressing a stabilized prefusion form of the SARS-CoV-2 spike protein elicits potent immunity after a single dose” bioRxiv, 28.4.2021 (https://www.biorxiv.org/content/10.1101/2021.04.28.441832v1.full)

[3] VBI-2902 – Wikipedia https://en.wikipedia.org/wiki/VBI-2902 (pridobljeno 5. 5. 2021)

[4] VBIVACCINE – VBI Vaccines Announces Publication of Preclinical and Challenge Study Data of its eVLP Vaccine Candidate Against COVID-19 (VBI-2902) April 28, 2021 https://www.vbivaccines.com/press-releases/vbi-2902-preclinical-and-challenge-study-data/ (pridobljeno 6. 5. 2021)

[5] VBIVACCINE - VBI Vaccines Announces Preclinical Coronavirus Program Data and Selection of Clinical Candidates with Potential as One-Dose Vaccines https://www.vbivaccines.com/press-releases/preclinical-coronavirus-data-candidate-selection/ (pridobljeno: 7. 5. 2021)

[6] VBI-2902a - ClinicalTrials.gov, Safety, Tolerability, and Immunogenicity of the COVID-19 Vaccine Candidate (VBI-2902a) https://clinicaltrials.gov/ct2/show/NCT04773665 (pridobljeno: 7. 5. 2021)

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