Catalog # NX4095

phospho-iNOS (Tyr-1055) Peptide

Blocking Peptide

Application / Dilution
ELISA50 ng/well

Size 50 μg



Nitric oxide synthases (NOS), the enzymes responsible for synthesis of NO, are homodimers whose monomers are themselves two fused enzymes: a cytochrome reductase and a cytochrome that requires three cosubstrates (L-arginine, NADPH, and oxygen) and five cofactors or prosthetic groups (FAD, FMN, calmodulin, tetrahydrobiopterin, and heme). Several distinct NOS isoforms are produced from three distinct genes, inducible NOS (iNOS, NOS-II), neuronal NOS (bNOS, NOS-I), and endothelial NOS (eNOS, ecNOS, NOS-III). The inducible form of NOS, iNOS, is Ca2+ independent and is expressed in a broad range of cell types in response to stimulation with cytokines and exposure to microbial products. Phosphorylation of iNOS may regulate its activity and stability. Src kinase-induced phosphorylation of Tyr-1055 in iNOS reduces proteasomal degradation of iNOS leading to increased NO production. Thus, phosphorylation may be an additional control for regulating iNOS activity in response to inflammatory conditions.



Tyryshkin, A. et al. (2009) J Biol Chem. 285(1):784.
Kleinert, H. et al. (2003) Biol Chem. 384(10-11):1343.
Xie, Q.W. et al. (1992) Science 256:225.

Phospho-iNOS (Tyr-1055) synthetic peptide corresponds to amino acids surrounding Tyr-1055 in human iNOS. This sequence is well conserved in rat and mouse iNOS, and has some homology to the conserved sites in eNOS (Tyr-1087) and nNOS (Tyr-1326).

*For more information, see UniProt Accession P35228
Blocking peptide is supplied in 50µl phosphate-buffered saline and 0.05% sodium azide.

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.

The peptide is specifically recognized by anti-iNOS (Tyr-1055) phospho-specific antibody (NP4091) in ELISA, and has been shown to block the reactivity of NP4091 during Western blot. In addition, the peptide is recommended for use in blocking NP4091 reactivity in immunocytochemistry.

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

This kit contains: