Activities in Family	UDP-Glc: glycogen glucosyltransferase (EC 2.4.1.11); ADP-Glc: starch glucosyltransferase (EC 2.4.1.21); NDP-Glc: starch glucosyltransferase (EC 2.4.1.242); UDP-Glc: α-1,3-glucan synthase (EC 2.4.1.183) UDP-Glc: α-1,4-glucan synthase (EC 2.4.1.-)
Mechanism	Retaining
3D Structure Status	GT-B
Statistics	GenBank accession (22020); Uniprot accession (3415); PDB accession (20); 3D entries (8); cryst (0)

Archaea
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
UDP-Glc/ADP-Glc glycogen synthase (PAB2292)	2.4.1.11 2.4.1.21	Pyrococcus abyssi GE5	CAB49000.1 NP_125769.1	Q9V2J8	2BFW[A] 1.80 2BIS[A,B,C] D-1-deoxy-Glcp 2.01 3FRO[A,B,C] D-1-deoxy-Manp 2.50 3L01[A,B] α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp 1.35 5U09[A] 2.40
Bacteria
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
glycogen synthase 1 (GlgA)	2.4.1.21	Agrobacterium tumefaciens A348	AAD03474.1 CAV22810.1	P0A3F3 P39670	1RZU[A,B] 1.60 1RZV[A,B] 2.30
granule bound starch synthase		Cyanobacterium sp. CLg1	AHB52786.1		6GNF[A,B,C] <non_carb>-(1-4)-α-D-6-deoxy-Glcp4N-(1-4)-α-D-Glcp-(1-4)-β-D-Glcp α-D-Glcp 2.76
glycogen synthase (GlgA;b3429)	2.4.1.21	Escherichia coli str. K-12 substr. MG1655	AAC76454.1 AAA23870.1 AAA58227.1 AAA98737.1 AAE32680.1 ACI76461.1 ACI76462.1 ACI76463.1 ACI76464.1 ACI76465.1 AIZ89571.1 ALI38891.1 AMC96312.1 AUG18132.1 AVI53588.1 AYG17629.1 CAP11378.1 CAV22746.1 NP_417887.1	P08323	2QZS[A] α-D-Glcp 2.29 2R4T[A] α-D-Glcp 1.90 2R4U[A] α-D-Glcp 1.24 3COP[A] α-D-Glcp 2.31 3CX4[A] α-D-Glcp-(1-4)-α-D-Glcp α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-β-D-Glcp 2.25 3D1J[A] 2.50 3GUH[A] D-1-deoxy-Glcp 2.20
Eukaryota
Protein Name	EC#	Organism	GenBank	Uniprot	PDB/3D Carbohydrate Ligands Resolution (Å)
starch synthase IV (SsIV;At4g18240) (AtSS4)	2.4.1.21	Arabidopsis thaliana	CAA16796.1 AEE84015.1 AID66007.1 BAE98723.1 CAB78826.1 NP_193558.1	O49727 Q0WVX5	6GNE[A,B] <non_carb>-(1-4)-α-D-6-deoxy-Glcp4N-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp α-D-Glcp-(1-4)-α-D-Glcp 1.83
granule-bound starch synthase		Cyanophora paradoxa	ABW83990.1	A8V967	6GNG[A,B] <non_carb>-(1-4)-α-D-6-deoxy-Glcp4N-(1-4)-α-D-Glcp-(1-4)-β-D-Glcp 3.25
starch synthase I (SSI)	2.4.1.21	Hordeum vulgare	AAF37876.1 CAX51357.1	Q9M5A3	4HLN[A] α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-α-D-Glcp-(1-4)-D-1-deoxy-Glcp 1.20
starch synthase 1 (WaxyG;Wx;Gbss1;Os06g0133000)	2.4.1.21	Oryza sativa Japonica Group	CCW36717.1 AAA33918.1 AAC61675.2 AAF72561.1 AAN77101.1 AAN77102.1 AAN77103.1 AAO33149.1 AAY22376.1 ABC17738.1 ABC17739.1 ABC17740.1 ABC17741.1 ABC17742.1 ABC17743.1 ABC17744.1 ABC17745.1 ABC17746.1 ABC17747.1 ABC17748.1 ABC17749.1 ABC17750.1 ABC17751.1 ABC17752.1 ABC17753.1 ABC17754.1 ABC17755.1 ABC17756.1 ABC17757.1 ABC17758.1 ABC17759.1 ABC17761.1 ABC17762.1 ABC17763.1 ABC17764.1 ABC17765.1 ABC17766.1 ABC17767.1 ABC17768.1 ABC17769.1 ABC17770.1 ABC17771.1 ABC17772.1 ABC17773.1 ABC17774.1 ACE88263.1 ACJ86348.1 ACJ86349.1 ACJ86350.1 ACJ86352.1 ACJ86355.1 ACJ86356.1 ACJ86360.1 ACJ86361.1 ACJ86364.1 ACJ86365.1 ACJ86366.1 ACJ86367.1 ACO48868.1 ACT52668.1 ACT52669.1 ACU82447.1 ACU82450.1 ACU82451.1 ACV52658.1 ACV52662.1 ACV52663.1 ACV52664.1 ACY26077.1 ACY41284.1 ACY56268.1 ACY56272.1 AEB52353.1 AGK90263.1 AII21926.1 AII21930.1 ALC78409.1 BAB19379.1 BAB88209.1 BAB88210.1 BAF18618.1 BAF92691.1 BAF92692.1 BAF92693.1 BAF92694.1 BAF92695.1 BAF92696.1 BAF92697.1 BAG91947.1 BAJ16183.1 BAJ16184.1 BAS95999.1 CAA37732.1 CAA41186.1 CAA44065.1 CAA46294.1 CAT81055.1 CCW36718.1 QBM91836.1 QBM91837.1	B7EHV0 P19395 Q0DEV5 Q8GZD6	3VUE[A] 1.99 3VUF[A] 1.76
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