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/).
: Although Adobe no longer supports CS3, you might find it through resellers. Keep in mind that it won't receive updates or support.
During a transitional period several years ago, Adobe provided for some legacy products. These installers came with pre‑embedded serial numbers that bypassed the need for online activation. For example, one user reported: "The advice was correct at the time, was perfectly legal, and would not have invited malware onto your system since the special activation‑free installer came directly from Adobe! I obtained the relevant version for my edition of CS3 via this officially supported route at the time, and it still works for installation today."
: Purchasing software or subscribing to services directly supports the developers and allows them to continue creating and improving their products.
The search for an "authorization code for Photoshop CS3" is ultimately a search for a solution to a problem that no longer exists in the way it once did. While the original authorization system is now defunct, Adobe did provide a workaround that is no longer accessible. Pursuing cracks or unauthorized keys is a dangerous and futile endeavor that exposes your system to significant risk.
If you own CS3 legitimately, contact Adobe. If you don’t, any “authorization code” you find online will likely lead to wasted time, viruses, or frustration — not a working copy.
Searching for "authorization code for photoshop cs3" online often leads to websites offering "Keygens" (Key Generators) or patches.
Users logged into their Adobe account, provided their original serial number, and received a new installer and a "universal" serial number that bypassed the need for an authorization server. Current Status:
: Because the activation servers are offline, the standard "Phone Activation" or "Internet Activation" screens will fail, and you cannot generate a new authorization code. No Longer Supported
Modern Apple Silicon M-series chips (M1, M2, M3, etc.) cannot execute this legacy code, even with the Rosetta 2 translation environment. To run CS3 on a Mac, you must use an antique machine running macOS Mojave (10.14) or earlier. Free and Modern Alternatives to Photoshop CS3
Whether you are getting an error or a "Serial Number Invalid" error
If you're looking for an alternative to Photoshop CS3, Adobe offers a range of creative cloud applications, including Photoshop CC, which provides a more modern and feature-rich image editing experience.
Before pursuing any "unofficial" method, it's essential to consider the legal and security implications.
When the servers were shut down, Adobe issued a universal "replacement" installer and serial number for customers who already owned the software. This version did not require an online authorization code. To use this, you must have your .
If you absolutely must run CS3, there are limited, unofficial options, but they come with high risks.
So why do people still search for “authorization code for Photoshop CS3”? Mostly because they find old installation disks, or they download abandonware versions from untrusted sites, and then hit the activation wall. The codes floating around on keygen sites are either:
If you still have access to your
: Avoid websites or methods that offer cracks, keygens, or unauthorized activation codes. Not only is this illegal, but it also exposes your computer to potential malware risks.
Adobe no longer supports the original activation process for CS3. This means that even with a valid, original serial number, the software cannot "phone home" to verify the license. 🛑 Avoid "Keygen" and Crack Sites
: Although Adobe no longer supports CS3, you might find it through resellers. Keep in mind that it won't receive updates or support.
During a transitional period several years ago, Adobe provided for some legacy products. These installers came with pre‑embedded serial numbers that bypassed the need for online activation. For example, one user reported: "The advice was correct at the time, was perfectly legal, and would not have invited malware onto your system since the special activation‑free installer came directly from Adobe! I obtained the relevant version for my edition of CS3 via this officially supported route at the time, and it still works for installation today."
: Purchasing software or subscribing to services directly supports the developers and allows them to continue creating and improving their products.
The search for an "authorization code for Photoshop CS3" is ultimately a search for a solution to a problem that no longer exists in the way it once did. While the original authorization system is now defunct, Adobe did provide a workaround that is no longer accessible. Pursuing cracks or unauthorized keys is a dangerous and futile endeavor that exposes your system to significant risk.
If you own CS3 legitimately, contact Adobe. If you don’t, any “authorization code” you find online will likely lead to wasted time, viruses, or frustration — not a working copy. authorization code for photoshop cs3
Searching for "authorization code for photoshop cs3" online often leads to websites offering "Keygens" (Key Generators) or patches.
Users logged into their Adobe account, provided their original serial number, and received a new installer and a "universal" serial number that bypassed the need for an authorization server. Current Status:
: Because the activation servers are offline, the standard "Phone Activation" or "Internet Activation" screens will fail, and you cannot generate a new authorization code. No Longer Supported
Modern Apple Silicon M-series chips (M1, M2, M3, etc.) cannot execute this legacy code, even with the Rosetta 2 translation environment. To run CS3 on a Mac, you must use an antique machine running macOS Mojave (10.14) or earlier. Free and Modern Alternatives to Photoshop CS3 : Although Adobe no longer supports CS3, you
Whether you are getting an error or a "Serial Number Invalid" error
If you're looking for an alternative to Photoshop CS3, Adobe offers a range of creative cloud applications, including Photoshop CC, which provides a more modern and feature-rich image editing experience.
Before pursuing any "unofficial" method, it's essential to consider the legal and security implications.
When the servers were shut down, Adobe issued a universal "replacement" installer and serial number for customers who already owned the software. This version did not require an online authorization code. To use this, you must have your . The search for an "authorization code for Photoshop
If you absolutely must run CS3, there are limited, unofficial options, but they come with high risks.
So why do people still search for “authorization code for Photoshop CS3”? Mostly because they find old installation disks, or they download abandonware versions from untrusted sites, and then hit the activation wall. The codes floating around on keygen sites are either:
If you still have access to your
: Avoid websites or methods that offer cracks, keygens, or unauthorized activation codes. Not only is this illegal, but it also exposes your computer to potential malware risks.
Adobe no longer supports the original activation process for CS3. This means that even with a valid, original serial number, the software cannot "phone home" to verify the license. 🛑 Avoid "Keygen" and Crack Sites