Understanding the Functional Role of the C-Terminal Domain of the Conserved Protein LepA
Notice bibliographique
Résumé
A large number of biochemical reactions that enable and regulate life are mediated by enzymatic proteins, which work by lowering the activation barrier of a biochemical reaction to increase the rate at which the reaction occurs. During translation, the ribosome is assisted by multiple different proteins which efficiently catalyze the formation polypeptides, to achieve a functional protein with as little error as possible. Many of the ribosomal associated proteins are GTPases, such as the Elongation Factors (EF-Tu and EF-G), which act as molecular switches by catalyzing the hydrolysis of GTP into GDP and an inorganic phosphate. For example, EF-G catalyzes the translocation of peptidyl-tRNA from the aminoacyl site, to the peptidyl site, as well as the movement of mRNA by one codon. There are many translational GTPases whose functions are still unknown, one of them being LepA. LepA is a highly conserved GTPase, present in bacteria and eukaryotic mitochondria and chloroplasts. It is the third most highly conserved protein in bacteria, falling behind EF-Tu and EF-G, implying that it is likely serves a significant function in the cell. LepA is very similar in structure EF-G, apart from it’s unique C-terminal domain (CTD). The role of the CTD and how it makes LepA different from EF-G in function are still unknown and is the basis for this study. For my project, six variants of LepA were constructed to study the role of the CTD including C-terminal truncations and single point mutations. Initial data from our lab showed that several of these variants had altered GTP hydrolysis rates presumably because key functional amino acids in the CTD were removed or mutated. To ensure this was the case, several control experiments were carried out including measuring the binding affinity of LepA wild type and variants to nucleotides (GTP / GDP) were measured via rapid kinetics using a stopped flow. To do so, a fluorescent analog of GTP / GDP was used to monitor binding and unbinding to LepA. The results showed that all LepA variants tested were able to bind nucleotides with the same affinity, suggesting that altered nucleotide binding was not responsible for the change in GTP hydrolysis observed prior, and also that LepA has approximately 8 times higher affinity toward GDP when compared to GTP. Overall the work has contributed to the understanding of the CTD in LepA, and thereby helping to determine the functional role of LepA in protein synthesis. *Indicates presenter
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».