Literature summary for 2.4.1.122 extracted from

Aryal, R.P.; Ju, T.; Cummings, R.D.
The endoplasmic reticulum chaperone Cosmc directly promotes in vitro folding of T-synthase (2010), J. Biol. Chem., 285, 2456-2462.

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Cloned(Commentary)

Cloned (Comment)	Organism
soluble T-synthase is made by co-expressing N-terminal HPC4 epitope-tagged soluble T-synthase with wild-type full-length Cosmc in Hi-5 insect cells using the Baculovirus system	Homo sapiens

Molecular Weight [Da]

Molecular Weight [Da]	Molecular Weight Maximum [Da]	Comment	Organism
39000	-	HPC4-tagged soluble T-synthase, determined by SDS-PAGE	Homo sapiens

Organism

Organism	UniProt	Comment	Textmining
Homo sapiens	-	-	-

Renatured (Commentary)

Renatured (Comment)	Organism
the chaperone Cosmc promotes renaturation of denatured T-synthase in vitro, HPC4-tagged soluble T-synthase is denatured in 1 ml of 6 M guanidinium hydrochloride, pH 7.2 for 90 min at room temperature, the sample is diluted 100times in reconstitution buffer (10 mM HEPES, 150 mM NaCl, 12 mM MgCl2, pH 7.8), reconstitution is initiated by the addition of 6His-sCosmc and ATP where the final concentration is 2.27 microM and 5 mM, reaction is incubated for 45 min at room temperature, 6His-sCosmc can cause up to 75% restoration of heat-denatured HPC4-tagged soluble T-synthase activity depending on how long the protein is heat-treated, and that it can restore 30% of activity to HPC4-tagged soluble T-synthase denatured by guanidinium hydrochloride treatment	Homo sapiens

Renatured (Comment)

Organism

the chaperone Cosmc promotes renaturation of denatured T-synthase in vitro, HPC4-tagged soluble T-synthase is denatured in 1 ml of 6 M guanidinium hydrochloride, pH 7.2 for 90 min at room temperature, the sample is diluted 100times in reconstitution buffer (10 mM HEPES, 150 mM NaCl, 12 mM MgCl2, pH 7.8), reconstitution is initiated by the addition of 6His-sCosmc and ATP where the final concentration is 2.27 microM and 5 mM, reaction is incubated for 45 min at room temperature, 6His-sCosmc can cause up to 75% restoration of heat-denatured HPC4-tagged soluble T-synthase activity depending on how long the protein is heat-treated, and that it can restore 30% of activity to HPC4-tagged soluble T-synthase denatured by guanidinium hydrochloride treatment

Homo sapiens

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg]	Specific Activity Maximum [µmol/min/mg]	Comment	Organism
additional information	-	inactive HPC4-tagged soluble T-synthase regained activity within 5 min after the addition of chaprone 6His-sCosmc, at 37°C	Homo sapiens

Synonyms

Synonyms	Comment	Organism
T-synthase	-	Homo sapiens

General Information

General Information	Comment	Organism
malfunction	mutations in the chaperone Cosmc, which is encoded by the X-chromosome gene (Xq24) in humans, leads to loss of T-synthase activity and expression of the abnormal Tn (GalNAc1-Ser/Thr) and Sialyl Tn (NeuAc2-3GalNAc1-Ser/Thr) antigens, which are also known as tumor-associated carbohydrate antigens, Tn syndrome is a rare autoimmune disease in which subpopulations of blood cells in all lineages carry an incompletely glycosylated membrane	Homo sapiens
physiological function	T-synthase is the key beta3-galactosyltransferase essential for biosynthesis of core 1 O-glycans (Gal beta1-3GalNAc alpha1-Ser/Thr) in animal cell glycoproteins	Homo sapiens