IMP-2958 

IMP-2958 is an inactive enantiomeric negative control probe with significantly reduced binding to RAB27A/B-Cys123.IMP-2958 serves as a negative control probe for off-target binding in phenotypic assays related to RAB27A/B studies.IMP-2958 functions as a control for stereoselective targeted covalent inhibitors of the RAB27-effector protein-protein interaction^[1].

IMP-2958 does not inhibit the WF pocket interaction of nRAB27A^Cys123, with an IC₅₀ > 100 μM in the FP competition assay^[1].
IMP-2958 (10 μM; 1 h) shows minimal covalent engagement of nRAB27A-Cys123, with only 7.7% labeling after 1-hour incubation at 10 μM^[1].
IMP-2958 (10 μM; 2 h) does not engage endogenous RAB27A or RAB27B in MDA-MB-231 cells at 10 μM, as it fails to compete with probe IMP-2566 for target binding^[1].
IMP-2958 (10-20 μM; 14 h) does not disrupt the RAB27A-SLP2-A protein-protein interaction in MDA-MB-231 cells at concentrations up to 20 μM after 14-hour incubation^[1].
IMP-2958 (10 μM; 24 h) does not phenocopy RAB27A knockout in melan-a mouse melanocytes at 10 μM after 24-hour incubation, as it does not induce perinuclear melanosome accumulation^[1].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

522.58

C₂₅H₂₆N₆O₅S

O=C([C@@H]1CCCN1S(C2=CC=C(NC(C=C)=O)C=C2)(=O)=O)NC3=CC=C(C(NC4=NN(C)C=C4)=O)C=C3

Room temperature in continental US; may vary elsewhere.

Please store the product under the recommended conditions in the Certificate of Analysis.

• [1]. De Vita E, et al. Discovery of stereoselective targeted covalent inhibitors of the RAB27-effector protein-protein interaction. bioRxiv. 2026:2026-05.