Annotations: 1SLL

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1slla1	All beta proteins	Concanavalin A-like lectins/glucanases	Concanavalin A-like lectins/glucanases	Leech intramolecular trans-sialidase, N-terminal domain	Leech intramolecular trans-sialidase, N-terminal domain	North American leech (Macrobdella decora ) [TaxId: 6405 ],	SCOPe (2.08)
A	d1slla2	All beta proteins	6-bladed beta-propeller	Sialidases	Sialidases (neuraminidases)	Leech intramolecular trans-sialidase, C-terminal domain	North American leech (Macrobdella decora ) [TaxId: 6405 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Concanavalin A-like lectins/glucanases	8041453	3000120	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Sialidases	8042835	3001607	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF02973	e1sllA1	A: beta sandwiches	X: jelly-roll	H: Concanavalin A-like	T: Concanavalin A-like lectins/glucanases	F: PF02973	ECOD (1.6)
A	PF13088	e1sllA2	A: beta duplicates or obligate multimers	X: beta-propeller-like	H: beta-propeller	T: 6-bladed	F: PF13088	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.120.200	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
A	2.120.10.10	Mainly Beta	6 Propeller	Neuraminidase		CATH (4.3.0)
A	2.40.220.10	Mainly Beta	Beta Barrel	Intramolecular trans-sialidase	domain 3	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF13088	BNR repeat-like domain (BNR_2)	BNR repeat-like domain	-	Repeat
A	PF02973	Sialidase, N-terminal domain (Sialidase)	Sialidase, N-terminal domain	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	SIALIDASE L	anhydrosialidase activity lyase activity carbon-oxygen lyase activity, acting on polysaccharides catalytic activity carbon-oxygen lyase activity hydrolase activity, acting on glycosyl bonds alpha-sialidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity exo-alpha-sialidase activity	carbohydrate metabolic process organic substance metabolic process primary metabolic process metabolic process	extracellular region cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR013320	Concanavalin A-like lectin/glucanase domain superfamily	Homologous Superfamily
A	IPR004124	Glycoside hydrolase, family 33, N-terminal	Domain
A	IPR011040	Sialidase	Domain
A	IPR026856	Sialidase family	Family
A	IPR023364	Trans-sialidase, domain 3	Homologous Superfamily
A	IPR036278	Sialidase superfamily	Homologous Superfamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	anhydrosialidase M-CSA #612	Intramolecular trans-sialidase (IT-sialidase) specifically cleaves the terminal N-acetyl-neuraminic acid-alpha-2-3-Galactose linkage in sialoglyco-conjugates. The released product is 2,7-anhydro-N-acetyl-neuraminic acid, indicating that the enzyme carries out an intramolecular reaction mechanism. This is in contrast to the hydrolytic sialidases whose product is free N-acetyl-neuraminic acid.	Defined by 3 residues: ASP:A-238 [auth A-318]GLU:A-515 [auth A-595]TYR:A-633 [auth A-713] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.2.1.18 (PDB Primary Data) Search M-CSA Motif + EC 3.2.1.18

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