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/).
Look for ap1g2-k9w7 and 15.3(3)JF15 .
From console (or SSH if IP is set):
This specific firmware version, , allows network administrators to run these access points in "Autonomous" (standalone) mode without requiring a wireless LAN controller (WLC). Key Specifications & Identification
The file for the legacy Cisco Aironet 1600 Series Access Points . Because this product family has passed its End-of-Support (EoS) lifecycle, Cisco has completely withdrawn it from the official software center. Network engineers and lab hobbyists must understand how to safely acquire this file and flash it via standard networking tools. File Overview & Key Specifications
Once the reload completes, log back into the device command-line interface to confirm a successful installation. AccessPoint> enable AccessPoint# show version Use code with caution.
Download a lightweight TFTP software host like SolarWinds TFTP or TFTPd32/64.
This is the smoothest path. If your organization has an active Cisco service contract covering the Aironet 1600 series, you can log into the official Cisco Software Download Center with your credentials. Once logged in, you can search for the file by name ( ap1g2-k9w7-tar.153-3.JF15.tar ) and download it directly.
: Any file sourced outside of Cisco's primary portal must be rigorously checked against the original MD5 string ( 17c7d8abdc195b96f3ea67bd35b3d2bd ) via command line tool or checksum utility before flashing. Step-by-Step Installation: Flashing via TFTP Server
Ensure your profile is tied to an active service agreement or a valid that explicitly grants software download privileges for wireless legacy products.
refers to Cisco's "Generation 2" internal hardware architecture for lightweight and autonomous access points. Documentation
The file is a specific Cisco Aironet IOS software image used to convert or update a select group of Cisco enterprise wireless access points (APs) into Autonomous (Standalone) mode . Cisco hardware models belonging to the ap1g2 platform family include the legacy Cisco Aironet 1600 Series Access Points (such as the AIR-CAP1602I or AIR-SAP1602E).
While holding down the button, plug the PoE Ethernet cable back into the unit to supply power.
The standard method to install the autonomous IOS image on your 1600 series AP is using the archive download-sw command in privileged EXEC mode ( enable ). The general syntax is as follows:
# Verify MD5 Checksum md5sum ap1g2-k9w7-tar.153-3.JF15.tar
is the official standalone Cisco IOS Software image used to convert Cisco Aironet 1600 Series Access Points (specifically the AIR-CAP1602i and AIR-CAP1602e platforms) from Lightweight (CAPWAP/Controller-managed) mode into Autonomous (Standalone) mode.
tar -xavf Ap1g2-k9w7-tar.153-3.jf15.tar
Look for ap1g2-k9w7 and 15.3(3)JF15 .
From console (or SSH if IP is set):
This specific firmware version, , allows network administrators to run these access points in "Autonomous" (standalone) mode without requiring a wireless LAN controller (WLC). Key Specifications & Identification
The file for the legacy Cisco Aironet 1600 Series Access Points . Because this product family has passed its End-of-Support (EoS) lifecycle, Cisco has completely withdrawn it from the official software center. Network engineers and lab hobbyists must understand how to safely acquire this file and flash it via standard networking tools. File Overview & Key Specifications
Once the reload completes, log back into the device command-line interface to confirm a successful installation. AccessPoint> enable AccessPoint# show version Use code with caution. Ap1g2-k9w7-tar.153-3.jf15.tar Download-
Download a lightweight TFTP software host like SolarWinds TFTP or TFTPd32/64.
This is the smoothest path. If your organization has an active Cisco service contract covering the Aironet 1600 series, you can log into the official Cisco Software Download Center with your credentials. Once logged in, you can search for the file by name ( ap1g2-k9w7-tar.153-3.JF15.tar ) and download it directly.
: Any file sourced outside of Cisco's primary portal must be rigorously checked against the original MD5 string ( 17c7d8abdc195b96f3ea67bd35b3d2bd ) via command line tool or checksum utility before flashing. Step-by-Step Installation: Flashing via TFTP Server
Ensure your profile is tied to an active service agreement or a valid that explicitly grants software download privileges for wireless legacy products. Look for ap1g2-k9w7 and 15
refers to Cisco's "Generation 2" internal hardware architecture for lightweight and autonomous access points. Documentation
The file is a specific Cisco Aironet IOS software image used to convert or update a select group of Cisco enterprise wireless access points (APs) into Autonomous (Standalone) mode . Cisco hardware models belonging to the ap1g2 platform family include the legacy Cisco Aironet 1600 Series Access Points (such as the AIR-CAP1602I or AIR-SAP1602E).
While holding down the button, plug the PoE Ethernet cable back into the unit to supply power.
The standard method to install the autonomous IOS image on your 1600 series AP is using the archive download-sw command in privileged EXEC mode ( enable ). The general syntax is as follows: Because this product family has passed its End-of-Support
# Verify MD5 Checksum md5sum ap1g2-k9w7-tar.153-3.JF15.tar
is the official standalone Cisco IOS Software image used to convert Cisco Aironet 1600 Series Access Points (specifically the AIR-CAP1602i and AIR-CAP1602e platforms) from Lightweight (CAPWAP/Controller-managed) mode into Autonomous (Standalone) mode.
tar -xavf Ap1g2-k9w7-tar.153-3.jf15.tar