Actin Protein (MICAL-Oxidized): Rabbit Skeletal Muscle (Rabbit Muscle, > 95% Pure )

MICAL interacts with F-actin and uses NADPH as a cofactor to oxidize actin at Met44 and Met47 (b-actin nomenclature). Functionally, oxidation of Met44 has a profound effect on actin polymerization because the residue resides in the D-loop of subdomain 2 of the protein, which is critical for actin subunit contacts; thus, upon oxidation, Met44 becomes negatively charged and interferes with actin monomer-monomer interaction and promotes F-actin severing and depolymerization. Regulation of actin oxidation at Met44/Met47 has been shown to destabilize F-actin in vivo and to play a key role in a growing number of cellular processes. As part of the MOXtrue product line, rabbit skeletal muscle actin protein (MICAL-oxidized) (MXA95) has been enzymatically oxidized at methionines 44 and 47 with the MICAL flavoprotein monoxygenase protein. Purified MICAL-oxidized actin has reduced susceptibility to subtilisin A cleavage at M47/G48 by > 90%, and has also been validated for downstream applications such as sedimentation assays.

To learn more about using MICAL-oxidized Actin as a research tool see our datasheet

To learn more about the MICAL/MsrB/Actin physiological redox system see our Newsletter

Each lot of purified protein is quality controlled to provide high batch to batch consistency, see COA documents.

Actin Protein (MICAL-Oxidized) Purity Determination

A 50 ?g sample of actin protein (MICAL-oxidized) was separated by electrophoresis in a 4- 20% tris-glycine gel and stained with Coomassie Blue. Protein quantitation was performed using the Precision Red^TM Protein Assay Reagent (Cat. # ADV02). Mark12 standard molecular weight markers are from Invitrogen.

Subtilisin Assay on MICAL-Oxidized Actin vs Native Actin

Actin (Cat. # AKL99) and MICAL-oxidized actin (Cat. # MXA95) was diluted to 0.1 mg/ml (2.3 ?M). 2 ?g of each sample was then left untreated, or treated with subtilisin (1:200 w/w) for 15 min. Samples were then separated by SDS-PAGE and visualized with Coomassie staining.

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Actin Sedimentation Oxidized Versus Native Actin

Actin (Cat# AKL99) and MIcal-oxidized actin was diluted to 0.2 mg/ml (4.6 ?M) or 0.8 mg/ml (18.4 ?M) (see method). Samples were then incubated with 2x polymerization buffer at room temperature. Samples were spun in an ultracentrifuge at 100, 000 g for 1.5 h. Samples were then separated by SDS-PAGE and visualized with Coomassie staining.

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For more information contact: signalseekercytoskeleton.com

Associated Products:

MOXtrue 6xHis MICAL-1 Protein (Cat. # MIC01)

MOXtrue 6xHis MsrB2 Protein (Cat. # MB201)

MOXtrue MICAL-oxidized Pyrene Labeled Actin (Cat. # MPAX1)

Rabbit Skeletal Muscle Actin (Cat. # AKL95)

Pyrene Labeled Rabbit Skeletal Muscle Actin (Cat.# AP05)