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Title:Opis fenotipskih lastnosti in primerjalna analiza genomov bakterije Gluconacetobacter entanii : magistrsko delo
Authors:ID Jelenko, Karin (Author)
ID Trček, Janja (Mentor) More about this mentor... New window
Files:.pdf MAG_Jelenko_Karin_2024.pdf (1,81 MB)
MD5: 003EA833D9F263F57BE0695EE8C0CE2C
 
Language:Slovenian
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FNM - Faculty of Natural Sciences and Mathematics
Abstract:Gluconacetobacter entanii je vrsta iz skupine ocetnokislinskih bakterij in taksonomsko spada v družino Acetobacteraceae. Opisana je bila leta 2000 po izolaciji, fenotipski karakterizaciji in analizi osnovnih DNA-taksonomskih markerjev sevov iz industrijskih bioreaktorjev za proizvodnjo alkoholnega kisa v južni Nemčiji. Vsi opisani sevi so tolerirali visoke odstotke ocetne kisline (do 14,6 %). Od vseh sevov je bil le tipski sev LTH 4560T shranjen v mednarodne zbirke mikroorganizmov, a se je kasneje pokazalo, da ni preživel dolgotrajnega shranjevanja v liofilizirani obliki. Taksonomija ocetnokislinskih bakterij je bila v zadnjih letih deležna več sprememb. Med drugim je bila skupina filogenetsko bližnjih sevov znotraj rodu Gluconacetobacter leta 2013 reklasificirana v rod Komagataeibacter, znotraj tega rodu pa je bil leta 2022 osnovan nov rod Novacetimonas. Vrsta G. entanii bi tej reklasifikaciji morala slediti, a zaradi pravil bakterijske taksonomije, ki dovoljuje spremembe samo za kultivabilne vrste, njeno ime ostaja nespremenjeno. V magistrskem delu smo preučili več sevov vrste G. entanii iz zbirke mikroorganizmov Laboratorija za mikrobiologijo, Oddelka za biologijo, na Fakulteti za naravo-slovje in matematiko, Univerze v Mariboru. Sevi so bili pridobljeni v predhodnih raziskavah iz bioreaktorjev za industrijsko proizvodnjo jabolčnega kisa iz različnih kisarn v Sloveniji. Sevom smo sistematično pregledali fenotipske lastnosti in s primerjalno genomiko preiskali podobnost njihovih genomov z genomom tipskega seva G. entanii. Na podlagi funkcijske anotacije genomov smo identificirani gena gmhB in psp, specifična za vrsto G. entanii. S tedenskim precepljanjem seva AV429 na gojišču RAE v prisotnosti 1 vol % ocetne kisline in 1 vol % etanola v obdobju 43 mesecev smo preiskali njegovo genomsko stabilnost. Rezultati so odkrili le točkovne mutacije, ne pa insercij in delecij. Opravljena karakterizacija novih kultivabilnih sevov bakterije G. entanii je odkrila slabo ujemanje fenotipskih lastnostih s tipskim sevom G. entanii, zaradi česar ti sevi ne morejo nadomestiti obstoječega tipskega seva kot neotipska vrsta. V želji poenotenja nadaljnjih raziskav na področju taksonomije rodu Novacetimonas predlagamo, da se sev G. entanii AV429 uporablja kot referenčni sev za bakterijsko vrsto G. entanii.
Keywords:Gluconacetobacter entanii, Novacetimonas, ocetnokislinske bakterije, taksonomija
Place of publishing:Maribor
Place of performance:Maribor
Publisher:[K. Jelenko]
Year of publishing:2024
Number of pages:IX, 59 f.
PID:20.500.12556/DKUM-90178 New window
UDC:579(043.2)
COBISS.SI-ID:208555779 New window
Publication date in DKUM:23.09.2024
Views:239
Downloads:31
Metadata:XML DC-XML DC-RDF
Categories:FNM
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Licences

License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:26.08.2024

Secondary language

Language:English
Title:Phenotypic characterization and comparative genome analysis of bacterium Gluconacetobacter entanii
Abstract:Gluconacetobacter entanii is a species of acetic acid bacteria within the family Acetobacteraceae. It was described in 2000 after isolation, phenotypic description, and analysis of basic DNA-taxonomic markers of strains from industrial bioreactors producing spirit vinegar in southern Germany. The described strains exhibited high tolerance to acetic acid, up to 14.6 %. Of all the strains, only the type strain LTH 4560T was deposited in international microorganism collections, and it was later found that it did not survive long-term storage in a lyophilized form. The taxonomy of acetic acid bacteria has undergone significant revisions in recent years. For example, phylogenetically related strains within the genus Gluconacetobacter were reclassified to the genus Komagataeibacter in 2013. Furthermore, in 2022, and a new genus named Novacetimonas was established. Despite these taxonomic updates, the species G. entanii retained its original name because the rules of bacterial taxonomy only permit name changes for cultivable species. In the master's thesis, we examined several strains of the species G. entanii from the microorganisms collection at the Microbiology Laboratory of the Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor. These strains were previously isolated from bioreactors for the industrial production of apple cider vinegar in various Slovenian vinegar factories. We conducted a systematic phenotypic characterization of these strains and performed the similarity analysis of their genomes with the genome of the type strain G. entanii using comparative genomics. Based on the functional annotation of the genomes, we identified specific genes, gmhB and psp, which are unique to the species G. entanii. Additionally, we investigated the genomic stability of the strain AV429 by subjecting it weekly preculturing on RAE culture medium containing 1 vol % acetic acid and 1 vol % ethanol over a period of 43 months. This long-term study revealed only point mutations, with no significant insertions and deletions. The phenotypic characterization of these new cultivable strains of G. entanii revealed a poor match with the type strain of G. entanii. Consequently, these strains cannot serve as a neotype species replacement for the existing type strain. To unify further research in the taxonomy of the genus Novacetimonas, we propose that the strain G. entanii AV429 be used as a reference strain for the bacterial species G. entanii.
Keywords:Gluconacetobacter entanii, Novacetimonas, acetic acid bacteria, taxonomy


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