phospho-cytokeratin-8 (K8) (Ser431), Mouse anti-Human, Mouse, Clone: 5B3, Millipore Sigma™

Mouse Monoclonal Antibody

Catalog Number	Mfr. No.	Quantity
MABT33825UG	MilliporeSigma MABT33825UG	25 μg
MABT338100	MilliporeSigma MABT338100UG	100 μg

Description

Anti-phospho-cytokeratin-8 (K8) (Ser431), clone 5B3, Cat. No. MABT338, is a mouse monoclonal antibody that detects type II Cytokeratin-8 phopshorylated on serine 431 and has been tested for use in Immunofluorescence and Western Blotting.

Keratin, type II cytoskeletal 8 (UniProt: P05787; also known as Cytokeratin-8, CK-8 Keratin-8, K8, Type-II keratin Kb80) is encoded by the KRT8 (also known as CYK8) gene (Gene ID: 3856) in human. Cytokeratin-8 is a type II, neutral to basic, protein of the intermediate filament family that together with Cytokeratin-19 (KRT19) helps to link the contractile apparatus to dystrophin at the costameres of striated muscle. Cytokeratin-8 can undergo phosphorylation on three major serine residues: Serine 23, 431, and 73. Serine 23 is shown to be highly conserved in all type II keratins. Phosphorylation at Serine 431 is reported to increase during mitosis and upon treatment with epidermal growth factor. Cytokeratin-8 can also undergo O-glycosylation in a cell cycle-dependent manner and glycosylation increases its solubility and reduces stability by inducing proteasomal degradation. Mutations in KRT8 gene have been linked to liver cirrhosis that is characterized by severe panlobular liver-cell swelling with Mallory body formation, prominent pericellular fibrosis, and marked deposits of copper. Two isoforms of Cytokeratin-8 have been described that are produced by alternative splicing.

Specifications

• Antigen: phospho-cytokeratin-8 (K8) (Ser431)
• Dilution: Immunofluorescence Analysis: A representative lot detected phospho-cytokeratin-8 (K8) (Ser431) in Immunofluorescence applications (Ku, N.O., et. al. (1997). J Biol Chem. 272(11):7556-64).Western Blotting Analysis: A representative lot detected phospho-cytokeratin-8 (K8) (Ser431) in Western Blotting applications (Yoon, K.H., et. al. (2001). J Cell Biol. 153(3):503-16; Ridge, K.M., et. al. (2005). J Biol Chem. 280(34):30400-5; Ku, N.O., et. al. (1997). J Biol Chem. 272(11):7556-64).
• Classification: Monoclonal
• Form: Purified
• Regulatory Status: RUO
• Target Species: Human, Mouse
• Gene Alias: Keratin;type II cytoskeletal 8;CK-8;Keratin-8;K8;Type-II keratin Kb80
• Gene Symbols: KRT8;CYK8
• Isotype: IgG1 κ
• Purification Method: Protein G purified
• Test Specificity: Clone 5B3 specifically detects cytokeratin-8 phosphorylated on serine 431.

• Clone: 5B3
• Applications: Immunofluorescence, Western Blot
• Conjugate: Unconjugated
• Host Species: Mouse
• Research Discipline: Cell Structure
• Formulation: Purified mouse monoclonal antibody IgG1 in buffer containing 0.1 M Tris-Glycine (pH 7.4), 150 mM NaCl with 0.05% sodium azide.
• Gene ID (Entrez): NP_001243222
• Immunogen: Cytokeratin-8/18 purified from okadaic acid-treated HT29 cells.
• Primary or Secondary: Primary
• Content And Storage: Stable for 1 year at 2-8°C from date of receipt.