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RB Active human

recombinant, expressed in E. coli, ≥80% (SDS-PAGE)

p105-Rb, Retinoblastoma 1, OSRC, RB1, Retinoblastoma-associated protein

biological source



expressed in E. coli


≥80% (SDS-PAGE)


aqueous solution

mol wt

43.5 kDa


pkg of 200 μg

storage condition

avoid repeated freeze/thaw cycles


>0.02 mg/mL

NCBI accession no.

UniProt accession no.

shipped in

dry ice

storage temp.


Gene Information

human ... RB1(5925)

General description

The gene encoding Retinoblastoma-associated protein (RB1) is a tumor suppressor gene localized on human chromosome 13q14.2. Human recombinant RB protein (773-end) with N-terminal GST tag (GenBank Accession No. NM_000321), expressed in a E. coli expression system.


Retinoblastoma-associated protein (RB1) has been used in cell activity assay. It is also used as a kinase substrate for the kinase assay and in Western blotting.

Biochem/physiol Actions

Retinoblastoma-associated protein (RB1) modulates the cell cycle. It acts as a repressor of transcription mediated by E2 factor (E2F) and influences transcriptional silencing. RB1 modulates mitochondrial activities and has a role in the organisation of heterochromatin. Mutations in the gene encoding this protein have been associated with childhood retinoblastoma.

Physical form

Formulated in 25 mM Tris-HCl, pH 8.0, 100 mM NaCl, 0.05% Tween-20, 30% glycerol and 3 mM DTT.

Preparation Note

Thaw on ice. Upon first thaw, briefly spin tube containing enzyme to recover full content of the tube. Aliquot enzyme into single use aliquots. Store remaining undiluted enzyme in aliquots at -70°C. Note: Enzyme is very sensitive to freeze/thaw cycles.

Storage Class Code

10 - Combustible liquids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Certificate of Analysis

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Certificate of Origin

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Michael J O'Connor et al.
Oncogene, 40(30), 4872-4883 (2021-06-24)
Cyclin D1 is an essential regulator of the G1-S cell-cycle transition and is overexpressed in many cancers. Expression of cyclin D1 is under tight cellular regulation that is controlled by many signaling pathways. Here we report that PARP14, a member
Daniele Simoneschi et al.
Nature, 592(7856), 789-793 (2021-04-16)
D-type cyclins are central regulators of the cell division cycle and are among the most frequently deregulated therapeutic targets in human cancer1, but the mechanisms that regulate their turnover are still being debated2,3. Here, by combining biochemical and genetics studies in
Don Anushka Sandaruwan Elvitigala et al.
Developmental and comparative immunology, 52(1), 48-57 (2015-04-29)
Apoptosis plays a key role in the physiology of multicellular organisms and is regulated by different promoting and inhibitory mechanisms. Cytokine-induced apoptotic inhibitor (CIAPI) was recently identified as a key factor involved in apoptosis inhibition in higher vertebrate lineages. However
Isabel C Lopez-Mejia et al.
Molecular cell, 68(2), 336-349 (2017-10-21)
The roles of CDK4 in the cell cycle have been extensively studied, but less is known about the mechanisms underlying the metabolic regulation by CDK4. Here, we report that CDK4 promotes anaerobic glycolysis and represses fatty acid oxidation in mouse
Sylviane Lagarrigue et al.
The Journal of clinical investigation, 126(1), 335-348 (2015-12-15)
Insulin resistance is a fundamental pathogenic factor that characterizes various metabolic disorders, including obesity and type 2 diabetes. Adipose tissue contributes to the development of obesity-related insulin resistance through increased release of fatty acids, altered adipokine secretion, and/or macrophage infiltration

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