Recombinant Human DNA Topoisom

DNA topoisomerase 1, EC 5.99.1.2, DNA topoisomerase I, TOP1, Scl-70.

TOP1 is an important nuclear enzyme that interconverts supercoiled DNA to the necessary topological conformations for standard DNA replication and transcription. TOP1 is the target antigen for TOP1 autoantibodies. TOP1 antibodies are a specific marker in scleroderma patients (specificity 98-100%) and are related with the existence of diffuse skin involvement and pulmonary fibrosis. In human tissues top1 enzyme is primarily synthesized as a protein with a molecular weight of 100-kDa. Most of this precursor is then proteolytically processed to a 70-kDa size, from which the TOP1 antigen has derived its name.

Recombinant TOP1 70kDa protein is an enzyme fragment having a molecular mass of 72KDa (pH 9.4). TOP1 70kDa protein is fused to a hexa-histidine purification tag.

Sf9 insect cells.

TOP1 70kDa is supplied in 20mM HEPES buffer pH-8.0, 500mM NaCl, and 20% glycerol.

1. Binds IgG-type human auto-antibodies.

2. Standard ELISA test (checkerboard analysis of positive/negative samples) and immunodot test with positive/negative samples.

Western blot with anti TOP1 70kDa autoantibody positive sample or monoclonal anti-hexa-His-tag antibody.

0.5-0.8 µg/ml (depending on the type of ELISA plate and coating buffer). Suitable for labeling of functional groups.

Greater than 95% as determined by SDS-PAGE.

Store at 4°C if entire vial will be used within 2-4 weeks. Store, frozen at -20°C for longer periods of time. 
Avoid multiple freeze-thaw cycles.

SDS

Prospec's products are furnished for LABORATORY RESEARCH USE ONLY. The product may not be used as drugs, agricultural or pesticidal products, food additives or household chemicals.