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G4256

Sigma-Aldrich

Galactose-1-phosphate Uridyltransferase from galactose-adapted yeast

Type IV, lyophilized powder, 20-60 units/mg protein (modified Warburg-Christian)

Synonym(s):

GALT, UDP glucose:α-D-galactose-1-phosphate uridyltransferase

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About This Item

CAS Number:
Enzyme Commission number:
MDL number:
UNSPSC Code:
12352204
NACRES:
NA.54

type

Type IV

form

lyophilized powder

specific activity

20-60 units/mg protein (modified Warburg-Christian)

composition

Protein, 15-35%

foreign activity

6-phosphogluconate dehydrogenase ≤0.5%
UDP glucose pyrophosphorylase and galactokinase ≤0.2%

storage temp.

−20°C

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General description

Research area: Cell Signaling

Galactose-1-phosphate uridyltransferase (GALT) is a galactose metabolizing enzyme that facilitates the simultaneous conversion of uridine diphosphoglucose (UDP-glucose) and galactose-1-phosphate (gal-1P) to uridine diphosphogalactose (UDP-galactose) and glucose-1-phosphate. Classic Galactosemia (CG) is an inherited metabolic condition caused by deficiency of GALT activity. GALT gene is mapped to human chromosome 9p13. Deficiency of GALT results in type 1 galactosemia.

Application

Galactose-1-phosphate Uridyltransferase from galactose-adapted yeast has been used to perform enzyme assays.

Unit Definition

One unit will form 1.0 μmole of glucose 1-phosphate from UDP-glucose, galactose 1-phosphate and NADP+ per min at pH 8.7 at 25 °C as detected by a coupled system using phosphoglucomutase.

Physical form

Contains buffer salts as citrate and reduced glutathione

Storage Class Code

11 - Combustible Solids

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Jane Odhiambo Mumma et al.
Molecular genetics and metabolism, 93(2), 160-171 (2007-11-06)
Galactose is metabolized in humans and other species by the three-enzyme Leloir pathway comprised of galactokinase (GALK), galactose 1-P uridylyltransferase (GALT), and UDP-galactose 4'-epimerase (GALE). Impairment of GALT or GALE in humans results in the potentially lethal disorder galactosemia, and
J M Flanagan et al.
Heredity, 104(2), 148-154 (2009-07-30)
Classical or transferase-deficient galactosaemia is an inherited metabolic disorder caused by mutation in the human Galactose-1-phosphate uridyl transferase (GALT) gene. Of some 170 causative mutations reported, fewer than 10% are observed in more than one geographic region or ethnic group.
Deborah S Barbouth et al.
Pediatric research, 62(6), 720-724 (2007-10-25)
Classic galactosemia is caused by impaired galactose-1-phosphate uridyltransferase (GALT EC 2.7.712). If discovered and treated within the first days of life, the acute problems of hepatocellular damage, sepsis, and death are prevented. However, chronic problems such as ataxia, tremor, dyspraxic
Daniel Lazarevic et al.
Carbohydrate research, 344(12), 1449-1452 (2009-06-30)
All monodeoxygenated galactoses were treated with galactokinase, and for the 2-, 3-, and 4-deoxy compounds, transformation into the corresponding galactopyranosyl phosphates could be observed. In case of the 2-deoxy derivative, further reaction via UDP-2-deoxy-D-lyxo-hexose (UDP-2-deoxygalactose), which was also obtained chemically
E Crushell et al.
Journal of inherited metabolic disease, 32(3), 412-415 (2009-05-07)
Classical galactosaemia is relatively common in Ireland due to a high carrier rate of the Q188R GALT mutation. It is screened for using a bacterial inhibition assay (BIA) for free galactose. A Beutler assay on day one of life is

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