• USA Home
  • P6244 - Protein Tyrosine Phosphatase 1B human

P6244 Sigma-Aldrich

Protein Tyrosine Phosphatase 1B human

recombinant, expressed in E. coli

Synonym: PTP-1B



Related Categories Cell Biology, Cell Signaling and Neuroscience, Kinase/Phosphatase Biology, Tyrosine Phosphatase (TP), Tyrosine Phosphatase Biology More...
Quality Level   200
recombinant   expressed in E. coli
form   solution
specific activity   ≥20 units/mg protein
mol wt   37.4 kDa
concentration   ≥0.5 mg/mL
relevant disease(s)   cancer, diabetes, obesity
shipped in   dry ice
storage temp.   −70°C
Gene Information   human ... PTPN1(5770)


General description

Protein tyrosine phosphatase 1B human (PTP1B) is encoded by the gene PTPN1. In human chromosome, the gene PTPN1 is localized on 20q13.13. The protein has 37 kDa catalytic domain and the C-terminal hydrophobic residues targets the protein to the cytoplasmic side of the endoplasmic reticulum membrane.


Protein Tyrosine Phosphatase 1B (PTP1B) human has been used in treating cell lysate prior to immunoprecipitation and protein pull-down studies. It has also been used in PTP1B activity assay and also for the evaluation of inhibitors like betulinic acid (BA) and sodium orthovanadate (Na3VO4), and 6-chloro-3-formyl-7-methylchromone (CFM) on PTP1B.

Protein tyrosine phosphatase 1B (PTP1B) is a pharmaceutical target used to study the treatment of various diseases such as obesity, cancer and type II diabetes mellitus.

The inhibitory effect of 8-(4-chlorophenylthio)-cAMP and 8-(4-chlorophenylthio)-cGMP on protein tyrosine phosphatase-1B has been assayed.

Biochem/physiol Actions

PTP-1B is a recombinant, non-transmembrane protein expressed in E. coli containing amino acid residues 1-322 of human PTP-1B. It has a molecular mass of 37.4 kDa. It is an abundant intracellular enzyme that is thought to act as a negative regulator of certain signaling pathways. It dephosphorylates tyrosine-phosphorylated proteins and peptides, and is usually localized in the cytostolic domain of the ER.

PTP1B dephosphorylates c-Src in several human breast cancer cell lines has a regulatory role for PTP1B in the control of c-Src kinase activity. PTP1B is regulates the cardiovascular effects of leptin. PTP1B controls the JAK/STAT signaling pathway by dephosphorylation of JAK2.

Polymorphism in the gene PTPN1 is associated with type 2 diabetes and obesity.

Unit Definition

One unit will hydrolyze 1.0 μmole of a phosphopeptide, EGFR fragment 988-998, per minute at pH 7.2 at 30 °C

Physical form

Supplied as a solution in 50 mM HEPES (pH 7.2), 1 mM EDTA, 5 mM DTT, and 0.05% NP-40

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

Please Enter a Lot Number

Certificate of Origin (COO)

Please Enter a Lot Number
Protocols & Articles
Peer-Reviewed Papers


Related Products

Technical Service:

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

Bulk Ordering & Pricing:

Need larger quantities for your development, manufacturing or research applications?