Biological Information

Background Information:

Phosphorylase kinase (Phk) is a complex enzyme consisting of four different subunits, (abgd)4, and isoforms or splice variants exist for each subunit. A muscle specific form of Phk deficiency is caused by mutations in the gene for the muscle isoform of the a subunit, PHKA1, whereas liver Phk deficiency can be caused by mutations in three genes: PHKA2, PHKB, and PHKG2. PHKB mutations cause autosomal recessive Phk deficiency of both liver and muscle, but liver symptoms predominate and the biochemical muscle involvement is often not clinically apparent. Ten different mutations in the PHKB gene have been identified in seven patients. PHKG2, also autosomal, encodes the testis/liver isoform of the catalytic g subunit. PHKG2 is a serine/threonine kinase that plays an important role in glycogen metabolism. Inhibition of PHKG2 may result in recurrent hypoglycemia, liver fibrosis and increased risk of cirrhosis.

Family:

Kinase

Sub Family:

CAMK

Class:

Protein Ser/Thr

Protein Name:

PHKG2

Uniprot Number:

P15735

Protein Aliases:

PHK-gamma-T|PSK-C3|Phosphorylase kinase subunit gamma-2

Gene Name:

PHKG2

Gene ID:

5261

Accession Number:

NM_000294

Organism:

Human

Construct Details:

1-301; F290L recombinant

Assay Information

Assay Type:

Biochemical

Assay Sub Type:

Enzymatic

Functional Mode:

Antagonist

Detection Method:

Radiometric

Measured Response:

Scintillation

Testing Information

Procedure Summary:

PhKg2 (h) is incubated with 8 mM MOPS pH 7.0, 0.2 mM EDTA, 250 µM KKLNRTLSFAEPG, 10 mM MgAcetate and [gamma-33P]-ATP (specific activity and concentration as required). The reaction is initiated by the addition of the Mg/ATP mix. After incubation for 40 minutes at room temperature, the reaction is stopped by the addition of phosphoric acid to a concentration of 0.5%. An aliquot of the reaction is then spotted onto a filter and washed four times for 4 minutes in 0.425% phosphoric acid and once in methanol prior to drying and scintillation counting

Substrate:

250 uM KKLNRTLSFAEPG

Tracer:

33P

ATP Concentration:

[ATP]= 10µM (Km= 11.26µM )

Incubation:

40 min at Room temperature

Control Inhibitor:

Staurosporine

Test Sample Requirements:

Please provide compounds dissolved in 100% DMSO (PBS or HBSS prohibited).
Stock solution should be ≥50× the final assay concentration (a 10 mM stock is also acceptable).
Required volume:
– <60 kinase assays: 120 µL of 50× stock
– ≥60 assays: 420 µL of 50× stock
If you supply 10 mM stocks or powder (pre-weighed), we will apply the appropriate conversion.
For batches of ~50 compounds supplied as solids, the TAT will be extended.

Minimum Order Quantity:

2

Turnaround Time

Standard:

6 Business Days

Service Scheduling Note:

Assay is run on a weekly schedule beginning on Friday.  Compounds and purchase order must be received on or before 13:00 CET Thursday for the order to be included on the service run that begins on Friday of the same week.

Reference Compound Data

PubChem ID

122130844

Name

Staurosporine

Measurement

1.38nM - IC50

Clinical Relevance

Therapeutic Area:

Metabolic Diseases

Additional Information

Brand:

LeadHunter

Testing Location:

KP - France - Celle L'Evescault

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