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/).
However, the operators of these platforms utilize a tactic known as "domain hopping." Within hours of a URL being blocked by local Internet Service Providers (ISPs), the operators migrate their entire library to a new domain name or an unlisted IP address, notifying their user base via Telegram channels, Twitter (X), or Facebook groups. Despite the regulatory pressure, the high search volume for terms like "layarkaca21 duta movie" proves that consumer demand keeps the market alive. The Shift Toward Legal Streaming Alternatives
Many of these unauthorized portals prompt users to download specific browser extensions or video players to view content. These files can contain tracking scripts designed to steal personal data, browser histories, and saved passwords. Conclusion: The New Era of Digital Consumption
The phrase "layarkaca21 duta movie" represents a fascinating chapter in the history of Indonesia’s digital adaptation. While these platforms initially democratized access to global entertainment when official options were scarce, the modern internet landscape has evolved. With the rise of affordable, safe, and culturally tailored legal streaming services, the reliance on risky, ad-heavy piracy sites is steadily declining, paving the way for a healthier and more sustainable creative industry in Indonesia.
is a prominent Indonesian streaming platform that serves as a massive directory for movies and TV shows found across the internet. Similarly, Duta Movie (or Dutamovie21) acts as an alternative portal, often used when other sites like Rebahin or Dunia21 are inaccessible. These sites are popular because they provide:
The phrase "layarkaca21 duta movie" is a digital fossil—a reminder of an era when piracy was the easiest path to nostalgia. But as Indonesian streaming grows, viewers now have a choice. Watching Duta through legal channels supports the very people who made it, and ensures that more films like it can be made in the future.
The digital landscape in Indonesia has undergone a massive transformation over the past decade. High-speed mobile internet and affordable smartphones completely changed how people consume entertainment. Instead of buying physical DVDs or waiting for television broadcasts, millions of viewers turned to online streaming. In this shifting landscape, platforms like (often abbreviated as LK21) and Duta Movie became household names.
🎬 Siapa di sini yang masih suka nostalgia lewat Layarkaca21? Kali ini saya coba nonton Duta Movie — film yang cukup menyita perhatian.
In the bustling world of online entertainment, few names have resonated as strongly within the Indonesian digital landscape as (LK21). Often referred to as "Duta Movie" by its dedicated user base, this site has long served as a go-to platform for streaming films, television series, and popular Asian dramas. As of mid-2026, the demand for free, accessible entertainment remains high, but the landscape surrounding platforms like Layarkaca21 has evolved significantly, balancing immense popularity with persistent legal challenges.
In many developing nations, the combined monthly cost of multiple subscription services (such as Netflix, Disney+, HBO Max, and Prime Video) is prohibitively expensive. Free streaming sites democratized access to global pop culture.
These platforms emerged as cultural phenomena, shaping the viewing habits of a generation. However, their rise also brought significant controversies, legal battles, and security concerns. Understanding the history, impact, and current reality of Layarkaca21 and Duta Movie offers a fascinating look into internet culture, piracy, and the evolving entertainment industry in Southeast Asia. The Rise of Layarkaca21 and Duta Movie
However, the operators of these platforms utilize a tactic known as "domain hopping." Within hours of a URL being blocked by local Internet Service Providers (ISPs), the operators migrate their entire library to a new domain name or an unlisted IP address, notifying their user base via Telegram channels, Twitter (X), or Facebook groups. Despite the regulatory pressure, the high search volume for terms like "layarkaca21 duta movie" proves that consumer demand keeps the market alive. The Shift Toward Legal Streaming Alternatives
Many of these unauthorized portals prompt users to download specific browser extensions or video players to view content. These files can contain tracking scripts designed to steal personal data, browser histories, and saved passwords. Conclusion: The New Era of Digital Consumption
The phrase "layarkaca21 duta movie" represents a fascinating chapter in the history of Indonesia’s digital adaptation. While these platforms initially democratized access to global entertainment when official options were scarce, the modern internet landscape has evolved. With the rise of affordable, safe, and culturally tailored legal streaming services, the reliance on risky, ad-heavy piracy sites is steadily declining, paving the way for a healthier and more sustainable creative industry in Indonesia. layarkaca21 duta movie
is a prominent Indonesian streaming platform that serves as a massive directory for movies and TV shows found across the internet. Similarly, Duta Movie (or Dutamovie21) acts as an alternative portal, often used when other sites like Rebahin or Dunia21 are inaccessible. These sites are popular because they provide:
The phrase "layarkaca21 duta movie" is a digital fossil—a reminder of an era when piracy was the easiest path to nostalgia. But as Indonesian streaming grows, viewers now have a choice. Watching Duta through legal channels supports the very people who made it, and ensures that more films like it can be made in the future. However, the operators of these platforms utilize a
The digital landscape in Indonesia has undergone a massive transformation over the past decade. High-speed mobile internet and affordable smartphones completely changed how people consume entertainment. Instead of buying physical DVDs or waiting for television broadcasts, millions of viewers turned to online streaming. In this shifting landscape, platforms like (often abbreviated as LK21) and Duta Movie became household names.
🎬 Siapa di sini yang masih suka nostalgia lewat Layarkaca21? Kali ini saya coba nonton Duta Movie — film yang cukup menyita perhatian. These files can contain tracking scripts designed to
In the bustling world of online entertainment, few names have resonated as strongly within the Indonesian digital landscape as (LK21). Often referred to as "Duta Movie" by its dedicated user base, this site has long served as a go-to platform for streaming films, television series, and popular Asian dramas. As of mid-2026, the demand for free, accessible entertainment remains high, but the landscape surrounding platforms like Layarkaca21 has evolved significantly, balancing immense popularity with persistent legal challenges.
In many developing nations, the combined monthly cost of multiple subscription services (such as Netflix, Disney+, HBO Max, and Prime Video) is prohibitively expensive. Free streaming sites democratized access to global pop culture.
These platforms emerged as cultural phenomena, shaping the viewing habits of a generation. However, their rise also brought significant controversies, legal battles, and security concerns. Understanding the history, impact, and current reality of Layarkaca21 and Duta Movie offers a fascinating look into internet culture, piracy, and the evolving entertainment industry in Southeast Asia. The Rise of Layarkaca21 and Duta Movie