Glycoside Hydrolase Family 31 / Subf 7

Activities in Sub Family	α-3-isomaltosyltransferase / cycloalternan-forming enzyme (EC 2.4.1.387); [retaining] cycloalternan-specific α-1,3-glucosidase / α-1,3-isomaltosidase (EC 3.2.1.204);
Mechanism	Retaining a
Clan	GH-D
3D Structure Status	( β / α ) ₈ barrel
Catalytic Nucleophile/Base	Asp
Catalytic Proton Donor	Asp
Note	Subfamily classification initiated by Arumapperuma et al. 2023 [PMID:36806678]
External resources	CAZypedia; PROSITE;
Commercial Enzyme Provider(s)	MEGAZYME;
Statistics	GenBank accession (493); Uniprot accession (9); PDB accession (13); 3D entries (3); cryst (0)


Bacteria
Protein Name	EC#	Reference	Organism	GenBank	Uniprot	PDB/3D	Subf
3-α-isomaltosyltransferase (CtsY;IMT)	2.4.1.387	pubmed	Arthrobacter globiformis A19	BAD34979.1	Q6BD67		7
cycloalternan-specific α-1,3-glucosidase / α-1,3-isomaltosidase (Kfla_1895)	3.2.1.204	pubmed	Kribbella flavida DSM 17836	ADB30989.1	D2PPM7	5X3I[A,B] 5X3J[A,B] 5X3K[A,B]	7
3-α-isomaltosyltransferase (IMT;Kfla_4052)	2.4.1.387	pubmed	Kribbella flavida DSM 17836	ADB33101.1	D2PSG3		7
cycloalternan-degrading enzyme (Lmo0182)	3.2.1.204	pubmed	Listeria monocytogenes EGD-e	CAC98397.1 NP_463713.1	Q8YAE8		7
cycloalternan-forming enzyme / 3-α-isomaltosyltransferase (CAFE;LmCAFE;Lmo2446)	2.4.1.387	pubmed	Listeria monocytogenes EGD-e	CAD00524.1 NP_465969.1	Q8Y4J2	4KMQ[A] 4KWU[A] 5F7U[A] 5HPO[A] 5HXM[A] 5I0D[A,B]	7
isomaltosyltransferase (CtsW)	2.4.1.387	pubmed	Sporosarcina globispora C11	BAB88401.1	Q8RQV2		7
3-α-isomaltosyltransferase (CtsY)	2.4.1.387	pubmed	Sporosarcina globispora C11	BAB88403.1 ABJ31058.1	Q8RQV0		7
3-α-isomaltosyltransferase (CtsY;IMT)	2.4.1.387	pubmed	Sporosarcina globispora N75	BAC54957.1 ABJ31059.1	Q84IQ3		7
cycloalternan-specific α-1,3-glucosidase (CADE;TpCADE;TpLmo0182;CQ11_05330)	3.2.1.204	pubmed	Trueperella pyogenes TP6375	AHU89502.1	A0A806M5Y7	5F7S[A,B] 5I0E[B] 5I0F[B] 5I0G[B]	7
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