Thiomyristoyl

Target: Thiomyristoyl targets SIRT2 selectively, with much weaker inhibition of SIRT1 and limited SIRT3 activity.

Mechanism of Action: Thiomyristoyl can be considered a SIRT2-recognition ligand for targeted-degradation design. A PROTAC based on this ligand would attach a linker and E3 ligase ligand to a derivatization site that preserves SIRT2 binding. The SIRT2-binding element localizes the bifunctional molecule to the deacetylase, while the E3-binding element recruits ubiquitin-ligase machinery. Effective degradation requires ternary-complex formation that positions SIRT2 for ubiquitin transfer. Polyubiquitinated SIRT2 is then expected to be recognized and degraded by the proteasome. This establishes a testable protein-depletion mechanism for research assays.

• PROTAC Linker Chemistry Optimization: Thiomyristoyl can be used to tune PROTAC physicochemical properties, including hydrophobicity, membrane association, and conformational flexibility. In targeted protein degradation studies, varying thiomyristoyl-containing linker contexts may improve ternary complex formation and degradation potency by modulating spatial orientation between the E3 ligase-recruiting and target-binding elements.

• Membrane-Associated Degradation Studies: Thiomyristoyl motifs can support membrane proximity effects that are relevant for degrading membrane-proximal or trafficking-associated proteins. Incorporating thiomyristoyl into PROTAC designs may enhance local effective concentration near cellular compartments, enabling systematic evaluation of degradation efficiency across subcellular localization states.

• E3 Ligase Recruiting Context Tuning: Thiomyristoyl can be explored as part of the PROTAC architecture to influence how the E3-recruiting moiety engages the ubiquitin-proteasome pathway. By adjusting linker placement and hydrophobic character, researchers can probe relationships between E3 engagement kinetics, ubiquitination patterns, and downstream target protein turnover.

• Structure–Activity Relationship Mapping: Thiomyristoyl-containing variants are suitable for SAR campaigns that correlate degradation outcomes with linker length, attachment position, and overall molecular shape. Systematic comparison of thiomyristoyl-enabled PROTACs can identify design rules that maximize degradation selectivity while minimizing off-target stabilization or reduced ubiquitination efficiency.

• Compartment-Specific Target Turnover: Thiomyristoyl can be leveraged to investigate whether targeted degradation depends on cellular compartment accessibility. PROTAC constructs incorporating thiomyristoyl may be tested in parallel with localization markers to determine how altered trafficking or compartment residence affects degradation kinetics, extent, and recovery after washout.

Thiomyristoyl is a selective SIRT2 inhibitor built on a peptide-like thiomyristoyl recognition motif, making it relevant for studies of deacylase-target engagement and degrader feasibility. Its extended lipophilic thioacyl chain and carbamate/amide groups require careful linker-position optimization. This molecule is described in detail below.

Structure: The structure contains a benzyl carbamate, an anilide terminus, a chiral amino-acid-like backbone, and a tetradecanethioyl substituent. The long thioacyl chain mimics acyl-lysine recognition features and contributes substantial hydrophobic surface area.

Reactivity: For SIRT2 degrader design, modification should avoid replacing the thiomyristoyl chain if it is required for recognition, and linker growth should be evaluated from the benzyl carbamate or terminal aryl-amide region only after biochemical confirmation. Because the molecule is lipophilic, shorter alkyl or mixed alkyl-PEG linkers may help balance physicochemical properties when paired with CRBN or VHL ligands, while IAP recruiters could be screened in cells as an alternative E3-ligase context.