a 2023

DECIPHERING THE FUNCTIONALITY OF THE UNSTRUCTURED N-TERMINAL DOMAIN OF THE BACTERIAL INITIATION FACTOR 2

ZAFAR, Hassan; Ludmila VESELÁ; Ahmed Adel Ibrahim Hassona HASSAN; Xueliang GE; Suparna SANYAL et al.

Základní údaje

Originální název

DECIPHERING THE FUNCTIONALITY OF THE UNSTRUCTURED N-TERMINAL DOMAIN OF THE BACTERIAL INITIATION FACTOR 2

Autoři

ZAFAR, Hassan; Ludmila VESELÁ; Ahmed Adel Ibrahim Hassona HASSAN; Xueliang GE; Suparna SANYAL a Gabriel DEMO

Vydání

NIVB meeting 2023, 2023

Další údaje

Jazyk

angličtina

Typ výsledku

Konferenční abstrakta

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Označené pro přenos do RIV

Ne

Organizace

Středoevropský technologický institut – Masarykova univerzita – Repozitář

ISSN

Klíčová slova česky

translace; inicializace; KryoEM; struktura

Klíčová slova anglicky

translation; initiation; cryoEM; structure

Návaznosti

LX22NPO5103, projekt VaV.
Změněno: 19. 1. 2024 03:19, RNDr. Daniel Jakubík

Anotace

V originále

Compartmentalization is a hallmark of living cells that allows them to perform complex tasks by dynamically coordinating matter and energy fluxes in space and time. This compartmentalization of membrane-less organelles in prokaryotes is driven by Liquid-Liquid Phase Separation (LLPS). Studies have shown LLPS to be a major driving force in the subcellular organization of bacterial cells. These biomolecular condensates are comprised of proteins that are generally rich in intrinsically disordered regions (IDRs). In prokaryotes, translation Initiation Factor 2 (IF-2) is a GTPase that binds the initiator tRNA and catalyzes the ribosomal subunit joining to form the elongation competent 70S complex. A large portion of the N-terminal domain of IF-2 contains IDRs, making the protein a favorable candidate to form LLPS. Additionally, due to the dynamic behaviour of the N-terminus of IF-2 the structure of the full-length protein is still missing. Therefore, the mechanistic understanding of its functional role is quite elusive, especially in ribosomal subunit joining. Here, we present biochemical evidence that IF-2 can phase separate under specific conditions. The IF-2 LLPS formation can provide deeper insight into compartmentalized translation machinery in bacterial cells. We also use timeresolved cryo-EM to capture intermediate states of the initiation process using native GTP and its non-hydrolysable analogue GDPCP. Here, the main goal is to gain structural insight about the disorded N-terminus of IF-2 and its role in ribosomal subunit joining.
Zobrazeno: 3. 5. 2026 02:50