2023
Characterisation of invisible conformation of domain 1.1 of σA factor of RNA polymerase from Bacillus subtilis
TUŽINČIN, Dávid, Petr PADRTA, Hana ŠANDEROVÁ, Alžběta RABATINOVÁ, Libor KRÁSNÝ et. al.Základní údaje
Originální název
Characterisation of invisible conformation of domain 1.1 of σA factor of RNA polymerase from Bacillus subtilis
Autoři
TUŽINČIN, Dávid (703 Slovensko, garant, domácí), Petr PADRTA (203 Česká republika), Hana ŠANDEROVÁ (203 Česká republika), Alžběta RABATINOVÁ (203 Česká republika), Libor KRÁSNÝ (203 Česká republika), Lukáš ŽÍDEK (203 Česká republika) a Pavel KADEŘÁVEK (203 Česká republika)
Vydání
19th European Magnetic Resonance Congress, EUROMAR 2023, 2023
Další údaje
Jazyk
angličtina
Typ výsledku
Konferenční abstrakt
Obor
10608 Biochemistry and molecular biology
Stát vydavatele
Česká republika
Utajení
není předmětem státního či obchodního tajemství
Odkazy
Kód RIV
RIV/00216224:14310/23:00131478
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova anglicky
σA factor; RNA polymerase; Bacillus subtilis; NMR; conformational exchange
Změněno: 22. 8. 2023 20:45, Mgr. Dávid Tužinčin
Anotace
V originále
Introduction: σ factors are essential components of bacterial RNA polymerase (RNAP) as they allow to recognize promotor sequences and initiate transcription. Domain 1.1 of vegetative σ factors occupies the primary channel of RNAP and also prevents binding of the σ factor to promoter DNA alone. Here, we show that domain 1.1 of Bacillus subtilis σA exists in two structurally distinct variants in dynamic equilibrium. Aims: To elucidate the structure and dynamics of minor conformation and to discover how does minor conformation affect transcription. Methods: Relaxation dispersion analysis, chemical exchange saturation transfer analysis, in vitro transcription Results: The major conformation at room temperature is represented by a previously reported well-folded structure solved by nuclear magnetic resonance, but 4 % of the protein molecules are present in a less thermodynamically favorable state. We show that this population increases with temperature and we predict its significant elevation at higher but still biologically relevant temperatures. We found that, in contrast to the major state, the detected minor state is partially unfolded. Its propensity to form secondary structure elements is especially decreased for the first and third α helices, while the second α helix and β strand close to the C-terminus are more stable. Functional experiments with full length σA and its shortened version lacking domain 1.1(σA_∆1.1) then revealed that while full length σA increases transcription activity of RNAP with increasing temperature, transcription with σA_∆1.1 remains constant. Conclusions: In conclusion, this study reveals conformational dynamics of domain 1.1 and provides a basis for studies of its interaction with RNAP and effects on transcription regulation.
Návaznosti
EF18_070/0009846, projekt VaV |
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GA22-12023S, projekt VaV |
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GJ18-04197Y, projekt VaV |
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LM2018127, projekt VaV |
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LX22NPO5103, projekt VaV |
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MUNI/A/1413/2022, interní kód MU |
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