Aliarcobacter butzleri is an emerging foodborne and zoonotic pathogen, yet many of its encoded proteins remain functionally uncharacterized. This lack of annotation limits understanding of its molecular mechanisms and hampers the identification of novel therapeutic targets. In this study, we systematically performed functional annotation of essential hypothetical proteins from the BNI-3166 strain using an integrative-in-silico approach to uncover potential drug and vaccine candidates. 2,367 protein-coding sequences were retrieved from the RefSeq database and were identified 356 as hypothetical proteins. Using BLASTp, we screened these HPs against the Database of Essential Genes and the human proteome to identify essential non-homologous proteins, resulting in 20 ENH candidates. Functional annotation was performed using several domain-based databases, including Pfam, InterPro, SMART, and SUPERFAMILY. Subsequently, physicochemical properties were analyzed and predicted subcellular localization using PSORTb and CELLO. To assess druggability, the ChEMBL database was used. Virulence factors using VFDB, VICMpred, and VirulentPred 2.0 were also predicted. Gene Ontology annotations were generated via ARGOT2.5. Furthermore, we explored protein-protein interactions using STRING and predicted tertiary structures with AlphaFold3. Moreover, Ligand binding pockets were predicted using PrankWeb, and antigenicity of vaccine candidates was assessed using VaxiJen v2.0. We identified 20 essential non-homologous hypothetical proteins, of which 10 were confidently annotated based on conserved domain analysis. These proteins were classified as enzymes, binding proteins, transporters, regulatory proteins, and potential virulence factors. Among them, eight exhibited characteristics of promising drug targets, while two showed potential as vaccine candidates based on subcellular localization. Druggability analysis revealed that nine proteins had no similarity to known drug targets, suggesting novel therapeutic potential. Predicted 3D structures generated using AlphaFold3 yielded pTM scores ranging from 0.44 to 0.92, indicating acceptable to high modeling confidence. Ligand binding site analysis confirmed druggability in six candidates, and antigenicity screening identified one protein as a potential vaccine target. This study provides a computational framework for identifying functionally important proteins in A. butzleri BNI-3166 and highlights novel therapeutic candidates for experimental validation, offering new directions in drug and vaccine development against this underexplored pathogen.
Key words: Aliarcobacter butzleri, Drug Target Identification, Functional Annotation, Hypothetical Proteins, In Silico Analysis
Received: 08.07.2025; Accepted: 01.09.2025; Early view: 24.09.2025 Published: 10.01.2026
DOI: 10.62063/ecb-66
Citation: Paul, S., Barua, S., & Barua, J.D. (2026). In-silico functional annotation and structural characterization of hypothetical proteins from Aliarcobacter butzleri BNI-3166: Insights into novel virulence and drug targets. The European chemistry and biotechnology journal, 5, 22-39. https://doi.org/10.62063/ecb-66
The copyrights of the studies published in The European Chemistry and Biotechnology Journal (EUCHEMBIOJ) belong to their authors
This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)(https://creativecommons.org/licenses/by-nc/4.0/).
It leaves the audience with a haunting realization: The Kent family can never go back to the way things were. The charm of the show has always been the "family drama" disguised as a superhero show. By the end of this episode, the disguise is gone, and they are forced to face the reality of their extraordinary lives. It is a turning point that redefines the series, stripping away the comfort of the status quo to reveal the raw, unyielding heroism underneath.
Despite efforts by Lois and Sam Lane to rescue her, Lucy lures them into a trap. Her betrayal leads to Sam being seriously injured and Clark being left vulnerable to Ally's energy-draining abilities.
While Jordan and Clark fight the physical battle, Jonathan is left to grapple with the fallout on the ground. This echoes the classic Lois Lane dynamic—being the most vulnerable person in a room full of invulnerable people. The episode reinforces that heroism in the Kent family is not defined by Kryptonian DNA, but by the willingness to stand in the fire, regardless of power levels. Jonathan’s arc here is one of acceptance; he accepts the danger of his father’s legacy, proving he is a "Super" son without needing a cape.
Season 2 has struggled with the status of Jonathan Kent, and Episode 13 highlights his unique path. In a family of gods and superheroes, Jonathan is the only one who is purely "human." In the context of the episode's high stakes, Jonathan's lack of powers forces him into a position of profound vulnerability.
The episode picks up immediately after the Métallo attack. Jon-El (Bizarro Jonathan) merges with Jonathan Kent using Ally’s pendant, causing a violent energy reaction. Superman tries to separate them, but the pendant’s power triggers a — a swirling black hole-like rupture in the atmosphere, draining the sun’s energy. If it collapses, it will vaporize half of Smallville. Lois races to find a way to reach Ally Allston in the Inverse World, while Jordan and John Henry Irons attempt to slow the vortex’s growth.
The defining moment of "Man of Steel" is the systematic dismantling of Clark Kent’s anonymity. For two seasons, the central tension of the show was the barrier between the Kent family and the world. In this episode, that barrier is obliterated.
The scene where Clark removes his glasses on live television is a subversion of the classic trope. Usually, the "glasses trick" is mocked as absurd. By having him take them off on purpose, the show acknowledges the absurdity and replaces it with the weight of consequence. He is sacrificing his privacy, his wife's safety, and his sons' normalcy for the greater good. It is the ultimate Christ-like sacrifice: laying down his life (his private life) for his friends.
A deeper analysis of the in the Natalie/John Henry vs. Ally fight? How this episode sets the stage for the Season 2 finale ?
Critically, the episode explores the theme of . Whether it is Lana Cushing distancing herself from the Kents to protect her family or Lucy Lane betraying her father out of a misguided search for belonging, "All Is Lost" suggests that secrets—even those kept for protection—inevitably cause decay in relationships.
It leaves the audience with a haunting realization: The Kent family can never go back to the way things were. The charm of the show has always been the "family drama" disguised as a superhero show. By the end of this episode, the disguise is gone, and they are forced to face the reality of their extraordinary lives. It is a turning point that redefines the series, stripping away the comfort of the status quo to reveal the raw, unyielding heroism underneath.
Despite efforts by Lois and Sam Lane to rescue her, Lucy lures them into a trap. Her betrayal leads to Sam being seriously injured and Clark being left vulnerable to Ally's energy-draining abilities.
While Jordan and Clark fight the physical battle, Jonathan is left to grapple with the fallout on the ground. This echoes the classic Lois Lane dynamic—being the most vulnerable person in a room full of invulnerable people. The episode reinforces that heroism in the Kent family is not defined by Kryptonian DNA, but by the willingness to stand in the fire, regardless of power levels. Jonathan’s arc here is one of acceptance; he accepts the danger of his father’s legacy, proving he is a "Super" son without needing a cape. superman & lois s02e13 msv
Season 2 has struggled with the status of Jonathan Kent, and Episode 13 highlights his unique path. In a family of gods and superheroes, Jonathan is the only one who is purely "human." In the context of the episode's high stakes, Jonathan's lack of powers forces him into a position of profound vulnerability.
The episode picks up immediately after the Métallo attack. Jon-El (Bizarro Jonathan) merges with Jonathan Kent using Ally’s pendant, causing a violent energy reaction. Superman tries to separate them, but the pendant’s power triggers a — a swirling black hole-like rupture in the atmosphere, draining the sun’s energy. If it collapses, it will vaporize half of Smallville. Lois races to find a way to reach Ally Allston in the Inverse World, while Jordan and John Henry Irons attempt to slow the vortex’s growth. It leaves the audience with a haunting realization:
The defining moment of "Man of Steel" is the systematic dismantling of Clark Kent’s anonymity. For two seasons, the central tension of the show was the barrier between the Kent family and the world. In this episode, that barrier is obliterated.
The scene where Clark removes his glasses on live television is a subversion of the classic trope. Usually, the "glasses trick" is mocked as absurd. By having him take them off on purpose, the show acknowledges the absurdity and replaces it with the weight of consequence. He is sacrificing his privacy, his wife's safety, and his sons' normalcy for the greater good. It is the ultimate Christ-like sacrifice: laying down his life (his private life) for his friends. It is a turning point that redefines the
A deeper analysis of the in the Natalie/John Henry vs. Ally fight? How this episode sets the stage for the Season 2 finale ?
Critically, the episode explores the theme of . Whether it is Lana Cushing distancing herself from the Kents to protect her family or Lucy Lane betraying her father out of a misguided search for belonging, "All Is Lost" suggests that secrets—even those kept for protection—inevitably cause decay in relationships.