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/).
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The mention of a "television broadcast" might indicate a fictional scenario where Haruhi's character organizes a broadcast challenge. However, the term "cabul" is strong and might be part of a translation or a specific inside joke. I should consider that the user might be looking for a positive spin on a potentially controversial topic or a creative take on Haruhi's storyline.
"Good report" might be a request for a positive or detailed report. The part in quotes seems to be a mix of Indonesian and possibly some other language. Breaking it down: "sgki027" could be a model or product number. "Tantangan cabul" translates to "perverted challenge" in English. "Siaran televisi" means "television broadcast". "Haruka Suzumiya" is a character from the anime "The Melancholy of Haruhi Suzumiya". "Work" could be a typo for "work" or "works", but "sgki027" sounds like a specific product code.
To respond appropriately, I need to provide a good report, so I should avoid any harmful or explicit content. Explaining that the query might involve inappropriate terms and offering assistance with a respectful and creative report based on the anime's lore would be best. Also, advising the user on how to rephrase their query for clarity and appropriateness is important.
I should also be cautious about any explicit content. Since the main topic is Haruhi Suzumiya, a well-known anime character, the user might be a fan creating content related to it. The product code suggests it's a specific item, but I need to clarify if that's a real product or a fictional creation.
I need to check if there's any actual product or content under this title that's appropriate. Alternatively, the user might be referencing a fictional scenario in the Haruhi Suzumiya universe where such a challenge exists. It's also possible that the user is asking for a creative report, perhaps a fan fiction or an analysis, despite the potentially inappropriate terms used.
Putting it all together, the user might be asking for a report about a "perverted challenge" related to Haruhi Suzumiya, possibly in the context of a television broadcast, but the exact connection isn't clear. The product code "sgki027" might be a fan-made item or a merchandise code. However, "tantangan cabul" could refer to inappropriate content, which is concerning.