PROTAC Compound Library

Name: PROTAC Library
Brand: BOC Sciences

What Is a PROTAC Library?

A PROTAC (Proteolysis-Targeting Chimeras) library is a systematically organized collection of bifunctional degrader compounds designed for targeted protein degradation research. Each compound in the library typically consists of three structural components: a ligand that engages the protein of interest, a linker that connects the two functional ends, and a ligand that recruits a specific E3 ubiquitin ligase. These collections are built to support researchers who need to screen, compare, and optimize degraders across multiple targets and E3 ligase systems without synthesizing each compound individually.

BOC Sciences offers an extensive range of PROTAC library products spanning multiple E3 ubiquitin ligase categories and target protein classes. Our collections are designed to support screening campaigns, target validation, lead optimization, and mechanistic studies in targeted protein degradation research.

Our PROTAC Library Catalog by E3 Ubiquitin Ligase

BOC Sciences organizes its PROTAC library collection by E3 ubiquitin ligase to help researchers select compounds that match their cellular context, target profile, and screening objectives. The E3 ligase determines which ubiquitination machinery is recruited to the target protein, directly influencing degradation efficiency, selectivity, and cellular applicability. Our collections span over 2,700 PROTAC compounds across established and emerging E3 ligase systems.

CRBN-Targeted PROTAC Libraries

Our CRBN-targeted PROTAC library represents our largest collection, featuring over 1,700 compounds. Cereblon (CRBN) is the substrate recognition component of the CRL4^CRBN E3 ubiquitin ligase complex and serves as one of the most widely exploited E3 systems in degrader research. CRBN-recruiting ligands such as thalidomide, pomalidomide, and lenalidomide analogs are well-characterized and compatible with diverse target classes. Our CRBN library includes compounds targeting kinases, epigenetic regulators, nuclear receptors, and transcription factors, with varied linker chemistries spanning PEG, alkyl, and rigid heterocyclic linkers. Researchers screening this collection can explore degradation across multiple target families while maintaining a consistent E3 recruitment strategy. For projects focused on CRBN-based degraders, we also offer CRBN-based PROTAC development solutions.

VHL-Targeted PROTAC Libraries

Our VHL-targeted PROTAC library contains over 800 compounds. Von Hippel-Lindau (VHL) protein is the substrate recognition subunit of the CRL2^VHL E3 ligase complex and was the first E3 system employed in PROTAC design. VHL-recruiting degraders often demonstrate high potency and well-defined structure-activity relationships. Our VHL collection spans compounds targeting protein kinases, BET family proteins, histone deacetylases, and nuclear receptors, with systematic linker variation enabling exploration of optimal target-ligase geometry. VHL-based PROTACs are particularly valuable for targets where CRBN-based approaches may be limited by cell-type-specific expression or competing endogenous substrates. BOC Sciences also provides dedicated VHL-based PROTAC development services for customized projects.

cIAP1-Targeted PROTAC Libraries

Our cIAP1-targeted PROTAC library includes a focused collection of compounds. Cellular inhibitor of apoptosis protein 1 (cIAP1) is a member of the IAP family that functions as a RING-domain E3 ligase. cIAP1-recruiting PROTACs offer an alternative degradation pathway that may be effective in cellular contexts where CRL4^CRBN or CRL2^VHL systems show limited activity. Our cIAP1 collection features compounds with IAP ligands derived from SMAC mimetic scaffolds, connected to target ligands through optimized linkers. These compounds are particularly relevant for research involving apoptosis-related proteins, kinase targets, and oncology-focused degradation programs.

XIAP-Targeted PROTAC Libraries

Our XIAP-targeted PROTAC library comprises a specialized set of compounds. X-linked inhibitor of apoptosis protein (XIAP) is another IAP family E3 ligase that binds caspase-regulatory proteins and modulates apoptotic signaling. XIAP-recruiting degraders provide researchers with an additional IAP-family option that may yield different degradation profiles compared to cIAP1-based approaches. Our XIAP collection includes compounds designed for targets where alternative E3 recruitment strategies are desired, supporting comparative studies across IAP family members.

MDM2-Targeted PROTAC Libraries

Our MDM2-targeted PROTAC library contains a dedicated collection of compounds. Mouse double minute 2 (MDM2) is an E3 ubiquitin ligase that negatively regulates the tumor suppressor p53 and has been successfully repurposed as a PROTAC-recruiting system. MDM2-based degraders are particularly relevant for oncology research and for targets where p53 pathway engagement may contribute to the desired biological outcome. Our MDM2 collection features compounds with nutlin-derived ligands and optimized linker architectures, providing options for researchers exploring this E3 system in degradation programs.

Emerging E3 Ligase-Focused PROTAC Libraries

In addition to established E3 systems, BOC Sciences offers emerging E3 ligase-focused PROTAC collections that provide alternative recruitment strategies for specialized research contexts. Our emerging ligase collections include degraders recruiting IAP family members, FEM1B, AhR, and CRL4-associated substrate receptors such as DCAF11, DCAF15, and DCAF16, as well as RING-domain ligases including RNF114 and RNF4. Together, our PROTAC library covers dozens of E3 ubiquitin ligase systems, giving researchers broad flexibility to match E3 recruitment with their cellular and target requirements.

Our PROTAC Library Catalog by Target Protein

In addition to E3 ligase-based organization, BOC Sciences structures its PROTAC library collections by target protein class. This arrangement helps researchers quickly locate degraders relevant to their specific target of interest, regardless of which E3 ligase system they prefer to employ. Our target-organized collections span major protein families relevant to oncology, immunology, neuroscience, and metabolic disease research.

Kinase-Targeted PROTAC Libraries

Protein kinases represent one of the most extensively targeted protein families in PROTAC research. Our kinase-targeted PROTAC library includes degraders directed against diverse kinase families, including tyrosine kinases, serine/threonine kinases, and lipid kinases. Target coverage includes EGFR, BTK, CDK family members, ALK, JAK, PI3K, and FAK, among others. Kinase degraders offer advantages over traditional kinase inhibitors by eliminating the target protein entirely rather than merely blocking its catalytic activity. This can overcome resistance mechanisms such as kinase domain mutations and amplification events. Our kinase collections span multiple E3 ligase systems, enabling researchers to compare degradation profiles across CRBN, VHL, and alternative recruitment strategies.

Epigenetic Regulator-Targeted PROTAC Libraries

Epigenetic proteins regulate gene expression through chromatin modification and recognition, and many have proven highly amenable to degradation. Our epigenetic regulator-targeted PROTAC library features degraders against BET family bromodomains (BRD2, BRD3, BRD4, BRDT), histone deacetylases (HDAC6), histone methyltransferases (EZH2), and chromatin remodeling complexes (SMARCA2, SMARCA4). BET-targeted degraders are among the most extensively studied PROTACs, demonstrating robust target elimination and profound downstream transcriptional effects. Our epigenetic collections support research into chromatin biology, transcriptional regulation, and oncology programs where epigenetic machinery drives disease progression.

Nuclear Receptor-Targeted PROTAC Libraries

Nuclear receptors are ligand-activated transcription factors that play critical roles in hormone signaling, metabolism, and proliferation. Our nuclear receptor-targeted PROTAC library includes degraders directed against androgen receptor (AR), estrogen receptor (ER), and related steroid hormone receptors. Nuclear receptor degraders are particularly valuable because they eliminate the receptor protein, blocking both ligand-dependent and ligand-independent signaling mechanisms. This approach has shown particular promise in oncology indications where receptor-driven transcription programs sustain malignant growth. Our nuclear receptor collections feature both antagonist-derived and selective binder ligands connected through optimized linkers.

Additional Therapeutic Target Classes

Beyond kinases, epigenetic regulators, and nuclear receptors, BOC Sciences maintains PROTAC libraries targeting additional protein classes of high research interest. These include transcription factors such as STAT3 and BRD4, E3 ligases themselves, and signaling proteins involved in proliferation and survival pathways. Our collections also cover emerging targets in neurodegeneration, autoimmune disease, and metabolic disorders. For researchers working with specialized target classes, we offer ligand design for target protein services to support the development of custom degrader collections.

Applications Supported by Our PROTAC Libraries

BOC Sciences PROTAC libraries are designed to support diverse research workflows across the degrader discovery and optimization pipeline. Our collections enable applications ranging from initial hit identification through lead optimization and mechanistic characterization.

PROTAC Libraries for High-Throughput Degrader Screening

Our PROTAC libraries are formatted for high-throughput screening campaigns, providing researchers with diverse chemical starting points for degrader discovery. Systematic collections organized by E3 ligase and target class enable parallel evaluation of multiple recruitment strategies against a target of interest. Screening-ready libraries reduce the time and resources required for initial hit identification, allowing research teams to focus on validating and optimizing promising degrader chemotypes.

PROTAC Libraries for Target Validation Screening

Target validation is a critical step in drug discovery, and PROTAC libraries provide powerful tools for confirming whether a protein is amenable to degradation-based functional knockdown. By screening a diverse collection against a target of interest, researchers can rapidly determine if degradation produces the expected phenotypic consequences. Our libraries support validation workflows by providing multiple independent degrader chemotypes against the same target, strengthening the correlation between target elimination and observed biological effects.

PROTAC Libraries for Selectivity Profiling

Understanding degrader selectivity is essential for developing compounds with favorable target profiles. Our organized PROTAC collections enable systematic selectivity profiling by providing structurally related compounds that can be evaluated across panels of related targets. Libraries organized by target class facilitate comparison of degradation activity against family members, while E3 ligase-organized collections help determine which recruitment strategies yield the most selective degradation. Selectivity evaluation services complement our library offerings with detailed characterization support.

PROTAC Libraries for Lead Optimization

Once initial degrader hits are identified, lead optimization requires systematic exploration of structure-activity relationships. Our PROTAC libraries support optimization campaigns by providing analog sets that vary linker length, composition, and E3 ligase pairing around established target ligands. This structured diversity enables researchers to identify optimal degrader configurations and prioritize analogs for further development. Custom library expansion services allow teams to generate additional analogs around promising lead structures.

PROTAC Libraries for Mechanism-of-Action Screening

Understanding how degraders work at the molecular level is essential for rational compound design. Our PROTAC libraries support mechanism-of-action studies by providing well-characterized compounds for evaluating ternary complex formation, ubiquitination efficiency, and downstream signaling consequences. Collections with defined E3 ligase and target ligand pairings enable researchers to dissect the contributions of each molecular component to overall degradation activity. Binding affinity measurement and degradation ability assay services provide additional analytical support for mechanism-focused research.

PROTAC Libraries for SAR Screening

Structure-activity relationship (SAR) screening is fundamental to degrader optimization. Our PROTAC libraries are designed with systematic structural variation to enable efficient SAR exploration. By screening collections that incrementally vary linker length, rigidity, chemistry, and E3 ligase pairing, researchers can map how specific molecular features influence degradation potency, selectivity, and kinetics. This systematic approach accelerates the identification of optimal degrader configurations and informs subsequent medicinal chemistry strategies.

Advantages of Using PROTAC Libraries in Degrader Research

PROTAC libraries offer distinct advantages over traditional single-compound approaches in targeted protein degradation research. The systematic organization, structural diversity, and screening-ready format of these collections address key challenges in degrader discovery and optimization.

Systematic Exploration of Structure-Activity Relationships

PROTAC libraries enable parallel evaluation of multiple structural variables, including linker length, linker chemistry, E3 ligase pairing, and target ligand orientation. This systematic approach reveals how each molecular component contributes to degradation activity, providing a comprehensive understanding of structure-activity relationships that would be impractical to achieve through individual compound synthesis. Researchers can identify optimal configurations more rapidly and make data-driven decisions about which analogs to prioritize for further optimization.

Accelerated Hit Identification and Optimization

By providing immediate access to diverse, pre-synthesized degrader collections, PROTAC libraries compress the timeline from target selection to active degrader identification. Rather than designing and synthesizing individual compounds serially, research teams can screen organized collections and identify promising hits within weeks. This acceleration is particularly valuable for competitive research programs and for targets with urgent biological validation needs.

Improved Selectivity Profiling Through Diverse Analog Sets

Selectivity is a critical consideration in degrader development, and PROTAC libraries facilitate comprehensive selectivity assessment by providing multiple chemotypes against the same target. By evaluating degradation across related targets using structurally diverse compounds, researchers can distinguish on-target degradation from off-target effects and identify compounds with favorable selectivity profiles. The availability of multiple independent degrader series against a target strengthens confidence in selectivity conclusions.

Reduced Design Cycle Time Compared to Individual Synthesis

The modular nature of PROTAC design, combined with pre-organized library collections, significantly reduces the design-synthesize-test cycle time. Researchers can evaluate multiple linker lengths, E3 ligase systems, and target ligand pairings in parallel, eliminating the sequential synthesis bottleneck that characterizes traditional medicinal chemistry. This efficiency translates to faster identification of lead degrader candidates and more informed optimization decisions.

PROTAC Library Options from BOC Sciences

Beyond our pre-assembled PROTAC library collections, BOC Sciences offers flexible options for researchers with specialized requirements. Our capabilities span custom library design, synthesis, and integrated analytical support.

Custom PROTAC Library Design and Preparation

For projects requiring specialized target coverage or unique structural features, BOC Sciences provides custom PROTAC library design and synthesis services. Our team works with researchers to define library scope, select appropriate target ligands and E3 ligase ligands, design linker variations, and execute synthesis at scales suitable for screening campaigns. Custom libraries can be organized around specific target classes, E3 ligase systems, or structural hypotheses, providing tailored collections that address project-specific research questions. Our custom PROTAC synthesis services support library preparation with flexible scale and purity options.

Integrated Support for Screening, Synthesis, and Optimization

BOC Sciences offers integrated support that extends beyond compound provision to encompass the full degrader discovery workflow. Our capabilities include virtual screening for library design, in vitro evaluation of degrader activity, activity assays for potency determination, and scale-up production for hit-to-lead progression. This integrated approach enables seamless transition from library screening through lead optimization, with consistent quality and expert technical support at each stage.

Why Choose BOC Sciences PROTAC Library?

BOC Sciences provides comprehensive PROTAC library products and services designed to support targeted protein degradation research at every stage. Our collections combine breadth, quality, and flexibility to meet the diverse needs of academic and industrial research teams.

Ready-to-Screen PROTAC Library Collections

Our pre-assembled PROTAC libraries are available for immediate screening, eliminating synthesis delays and enabling rapid project initiation. Collections are organized by E3 ligase and target protein class to facilitate efficient compound selection.

Broad Coverage Across E3 Ligase and Target Categories

With over 2,700 compounds spanning CRBN, VHL, cIAP1, XIAP, MDM2, and emerging E3 ligase systems, our libraries provide extensive coverage of degrader chemical space across major target protein families.

Custom PROTAC Library Design and Synthesis

For specialized research needs, we offer custom library design and preparation services, enabling researchers to define target scope, structural parameters, and screening formats aligned with specific project objectives.

Integrated Degrader Discovery and Analytical Support

Our capabilities extend beyond compound provision to encompass virtual screening, in vitro evaluation, activity assays, and scale-up production, providing seamless support from library screening through lead optimization.

Frequently Asked Questions (FAQ)

Frequently Asked Questions

Still have questions?

What does BOC Sciences PROTAC library include?

BOC Sciences PROTAC library includes diverse bifunctional degrader compounds organized for targeted protein degradation research. The collection can be selected by E3 ubiquitin ligase category, target protein class, linker structure, and screening purpose. It covers major E3 ligase-focused groups such as CRBN, VHL, cIAP1, XIAP, and MDM2, as well as selected emerging E3 ligase categories. Target-focused options include kinase-targeted, epigenetic regulator-targeted, nuclear receptor-targeted, and additional target protein classes. These products help researchers perform degrader screening, hit identification, target validation, selectivity profiling, and SAR exploration.

How does BOC Sciences support high-throughput screening?

BOC Sciences supports high-throughput degrader screening by providing organized PROTAC library products that allow researchers to evaluate many compound designs in parallel. Instead of testing one degrader structure at a time, teams can compare compounds with different target ligands, E3 ligase recruiters, linker lengths, linker chemistries, and molecular architectures. This approach helps identify productive degrader hits earlier and provides a clearer basis for follow-up compound design. BOC Sciences can also help customers select a focused compound set based on target class, E3 ligase preference, screening objective, and planned downstream analysis.

How can BOC Sciences support target validation?

BOC Sciences PROTAC libraries can support target validation by helping researchers evaluate whether degradation of a selected protein produces meaningful research readouts in the chosen experimental system. A library provides multiple chemically distinct degraders, which is more informative than relying on a single compound. Researchers can compare different E3 ligase recruiters, linker designs, and target ligand analogs to determine whether target reduction is consistent across independent structures. BOC Sciences can also connect library selection with degradation ability assays, binding affinity measurement, and selectivity evaluation to help customers interpret screening results more confidently.

How can researchers customize a PROTAC library?

Researchers can work with BOC Sciences to customize a PROTAC library by sharing the target protein, available ligand information, preferred E3 ligase category, linker design direction, screening purpose, and follow-up research goals. Based on these inputs, BOC Sciences can help design a target-focused library, E3 ligase comparison library, linker scanning library, or analog expansion set around a promising degrader structure. The purpose of customization is not simply to increase compound number, but to build a chemically meaningful library that directly addresses the customer’s research questions and supports efficient downstream decision-making.

What support is available after library screening?

After PROTAC library screening, BOC Sciences can support hit review, analog prioritization, linker optimization, E3 ligase strategy comparison, and custom follow-up compound preparation. Initial screening hits often require additional evaluation because degradation behavior depends on target engagement, linker geometry, E3 recruitment, molecular properties, and selectivity. BOC Sciences can help customers design focused follow-up analog sets around promising structures and connect these compounds with relevant evaluation services. This integrated support helps research teams move from broad library screening to more directed SAR exploration and degrader optimization.

Client Feedback on PROTAC Library Products

Comprehensive Library for Screening Campaigns

"The breadth of the CRBN and VHL collections allowed us to screen multiple target classes in parallel. Having access to systematically varied linkers and ligand pairings accelerated our degrader discovery timeline significantly compared to individual compound synthesis."

— Senior Scientist, Drug Discovery, North America

Valuable for Target Validation Studies

"We used the kinase-targeted PROTAC library to validate several emerging oncology targets. The organized collection made it straightforward to compare degradation profiles and confirm which targets were amenable to PROTAC-mediated knockdown."

— Principal Investigator, Cancer Research Institute, Europe

Efficient Procurement Process

"The product information was clearly organized by E3 ligase and target class, which simplified our internal review process. Our procurement and research teams could quickly identify relevant collections and coordinate screening logistics."

— Procurement Manager, Biotechnology Company

Support for Custom Library Expansion

"After identifying promising hits from the standard collection, we worked with BOC Sciences to expand the analog series around our lead compounds. The integrated approach from screening through custom synthesis streamlined our optimization program."

— Director of Chemistry, Pharmaceutical R&D