Catalog # MP5181

Myosin IIA Heavy Chain (Ser-1803), phospho-specific Antibody

Rabbit Polyclonal

Application / Dilution

ELISA	1:1000
WB	1:1000

Size 100 μl

Species Reactivity Hu, Rt, Ms, Ck

MW 200 kDa

Non-muscle myosin II is an actin-based motor protein essential to cell motility, division, migration, adhesion and polarity. This myosin forms a hexameric complex comprised of two heavy chains (NMHC-II), two essential light chains, and two regulatory light chains (RLC). In vertebrates, there are three NMHC-II isoforms (NMHC-IIA, NMHC-IIB, and NMHC-IIC), which exhibit distinct patterns of expression in cells and tissues. Regulation of NMHC-II activity occurs through RLC and HC phosphorylation. RLCs are phosphorylated at Thr-18 and Ser-19, which activates myosin II motor activity and promotes filament stability. By contrast, PKC phosphorylation of Ser-1/Ser-2 and Thr-9 in RLC may decrease activated myosin II interaction with actin. Several kinases phosphorylation NMHC-II isoforms directly. TRPM7 phosphorylates Thr-1800, Ser-1803, and Ser-1808, which reduces NMHC-IIA incorporation into the actin cytoskeleton. PKC phosphorylates NMHC-IIA on Ser-1916 and NMHC-IIB on multiple tailpiece serines leading to inhibition of filament assembly. Casein kinase II phosphorylates NMHC-IIA on Ser-1943 and increases disassembly of NMHC-IIA filaments.

References

Dulyaninova, N. & Bresnick, A. (2013) BioArchitect. 3(4):1.
Breckenridge, M.T. et al. (2009) Mol Biol Cell 20:338.
Dulyaninova, N.G. et al. (2007) Mol Biol Cell 18:3144.
Murakami, N. et al. (1998) Biochemistry 37:1989.

Western blot image of human A431 cells stimulated with calyculin A (100 nM, 30 min). The blots were untreated (lanes 1, 3 & 5) or treated with lambda phosphatase (lanes 2, 4 & 6), and probed with rabbit polyclonals Myosin IIA Heavy Chain (a.a. 1936-1950) (lanes 1 & 2), Myosin IIA Heavy Chain (Ser-1803), phospho-specific (lanes 3 & 4) or Myosin IIA Heavy Chain (Ser-1916) phospho-specific (lanes 5 & 6).

Phospho-Myosin IIA Heavy Chain (Ser-1803) synthetic peptide (coupled to KLH) corresponding to amino acid residues surrounding Ser-1803 in human myosin IIA heavy chain. This peptide sequence is highly conserved in rat and mouse myosin IIA heavy chain, and the site has some homology to the conserved sites in nonmuscle myosin IIB and smooth muscle myosin heavy chains.

*For more information, see UniProt Accession P35579

Rabbit polyclonal, affinity-purified antibody is supplied in 100μl phosphate-buffered saline, 50% glycerol, 1 mg/ml BSA, and 0.05% sodium azide. Store at –20°C. Stable for 1 year.

The products are are safely shipped at ambient temperature for both domestic and international shipments. Each product is guaranteed to match the specifications as indicated on the corresponding technical data sheet. Please store at -20C upon arrival for long term storage.

This antibody was cross-adsorbed to unphosphorylated Myosin IIA Heavy Chain (Ser-1803) peptide before affinity purification using phospho-Myosin IIA Heavy Chain (Ser-1803) peptide (without carrier). The antibody detects a 200 kDa* protein corresponding to Myosin IIA Heavy Chain on SDS-PAGE immunoblots of human A431 cells treated with Calyculin A. This reactivity is removed after treatment with lambda phosphatase.

*All molecular weights (MW) are confirmed by comparison to Bio-Rad Rainbow Markers and to western blot mobilities of known proteins with similar MW.

Product References:

Cao, Y. et al. (2018) Exp Cell Res. 373(1-2):119. (WB: human HeLa)

This kit contains: