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
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While Ass.Parade.12.2007.P1 is frustratingly obscure, its naming convention reveals a cultural touchstone of the adult industry at a specific moment in time. It connects a massive media brand, a niche series, a specific year of adult film production, and the decentralized file-sharing culture of the 2000s. It serves as a reminder of the shift to digital, the importance of series branding, and how content naming conventions remain a window into internet history.
For episodic content, magazines, or websites that updated on a regular schedule, the month and year of release were used instead of season or episode numbers. This allowed archiving software to index files chronologically.
The identifier Ass.Parade.12.2007.P1 corresponds to a 2007 adult film entry directed by Preston Parker and produced by Bang Bros. It is not an academic paper, but rather a title, often listed as a 2007 video release featuring performers like Eva Angelina. Details on the film are available on IMDb . Ass Parade 12 (Video 2007) - IMDb
The production featured an ensemble of the era's highest-profile adult performers, including Sunny Lane, Alexis Texas, Eva Angelina, Gianna Michaels, Bobbi Starr, and Holly Morgan.
Released during the peak of internet-exclusive adult content studio models, Ass Parade 12 was directed by Preston Parker and featured high-profile performers of the era.
In conclusion, while the specifics of Ass.Parade.12.2007.P1 may remain a mystery, the significance and impact of parades on communities are undeniable. As we celebrate the past, present, and future of parades, we honor the creativity, diversity, and community spirit that they embody.
In 2007, broadband internet was still evolving. Standard file systems (like FAT32) had file size limits, and optical media (CD-Rs and DVD-Rs) had strict storage capacities. Large video files were routinely split into smaller, manageable parts (Part 1, Part 2) using tools like WinRAR or HJSplit. If one segment corrupted during download, the user only had to redownload that specific 15MB to 100MB chunk rather than the entire file. The Infrastructure: BitTorrent, eDonkey, and Usenet
While Ass.Parade.12.2007.P1 is frustratingly obscure, its naming convention reveals a cultural touchstone of the adult industry at a specific moment in time. It connects a massive media brand, a niche series, a specific year of adult film production, and the decentralized file-sharing culture of the 2000s. It serves as a reminder of the shift to digital, the importance of series branding, and how content naming conventions remain a window into internet history.
For episodic content, magazines, or websites that updated on a regular schedule, the month and year of release were used instead of season or episode numbers. This allowed archiving software to index files chronologically.
The identifier Ass.Parade.12.2007.P1 corresponds to a 2007 adult film entry directed by Preston Parker and produced by Bang Bros. It is not an academic paper, but rather a title, often listed as a 2007 video release featuring performers like Eva Angelina. Details on the film are available on IMDb . Ass Parade 12 (Video 2007) - IMDb
The production featured an ensemble of the era's highest-profile adult performers, including Sunny Lane, Alexis Texas, Eva Angelina, Gianna Michaels, Bobbi Starr, and Holly Morgan.
Released during the peak of internet-exclusive adult content studio models, Ass Parade 12 was directed by Preston Parker and featured high-profile performers of the era.
In conclusion, while the specifics of Ass.Parade.12.2007.P1 may remain a mystery, the significance and impact of parades on communities are undeniable. As we celebrate the past, present, and future of parades, we honor the creativity, diversity, and community spirit that they embody.
In 2007, broadband internet was still evolving. Standard file systems (like FAT32) had file size limits, and optical media (CD-Rs and DVD-Rs) had strict storage capacities. Large video files were routinely split into smaller, manageable parts (Part 1, Part 2) using tools like WinRAR or HJSplit. If one segment corrupted during download, the user only had to redownload that specific 15MB to 100MB chunk rather than the entire file. The Infrastructure: BitTorrent, eDonkey, and Usenet