Annotations: 8XC4

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D		e8xc4D01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F:	ECOD (v294.2)
A		e8xc4A01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F:	ECOD (v294.2)

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D, F	Light Chain	IGKV1	Kappa	glycoprotein	SAbDab (2026-05-08)
C, E	Heavy Chain	IGHV4	-	glycoprotein	SAbDab (2026-05-08)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D, F	1E5-VL	-	-	-
C, E	1E5-VH	-	-	-
A, B	Glycoprotein	hydrolase activity, acting on glycosyl bonds alpha-sialidase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity exo-alpha-sialidase activity catalytic activity host cell surface binding binding host cell surface receptor binding	virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral process viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction symbiont entry into host cell symbiont entry into host	virion component viral membrane viral envelope host cell plasma membrane host cellular component cellular anatomical structure host cell part host cell membrane other organism part virion membrane

Chains	Accession	Name	Type
A, B	IPR016285	Haemagglutinin-neuraminidase	Family
A, B	IPR036278	Sialidase superfamily	Homologous Superfamily
A, B	IPR000665	Haemagglutinin/haemagglutinin-neuraminidase, paramyxovirus	Family

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.

8XC4 | pdb_00008xc4