4OR4

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d4or4a_	Alpha and beta proteins (a+b)	Influenza virus PB2 cap binding domain-like	Influenza virus PB2 cap binding domain-like	automated matches	automated matches	(Influenza B virus ) [TaxId: 11520 ],	SCOPe (2.08)
B	d4or4b_	Alpha and beta proteins (a+b)	Influenza virus PB2 cap binding domain-like	Influenza virus PB2 cap binding domain-like	automated matches	automated matches	(Influenza B virus ) [TaxId: 11520 ],	SCOPe (2.08)

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Flu_PB2_5th	e4or4A1	A: a+b three layers	X: Polymerase basic protein 2 cap-binding domain (From Topology)	H: Polymerase basic protein 2 cap-binding domain (From Topology)	T: Polymerase basic protein 2 cap-binding domain	F: Flu_PB2_5th	ECOD (1.6)
B	Flu_PB2_5th	e4or4B1	A: a+b three layers	X: Polymerase basic protein 2 cap-binding domain (From Topology)	H: Polymerase basic protein 2 cap-binding domain (From Topology)	T: Polymerase basic protein 2 cap-binding domain	F: Flu_PB2_5th	ECOD (1.6)

Chains	Accession	Name	Description	Comments	Source
A, B	PF00604	Influenza RNA polymerase PB2 CAP binding domain (Flu_PB2_5th)	Influenza RNA polymerase PB2 CAP binding domain	Influenza virus encodes a large, multidomain RNA-dependent RNA polymerase that can both transcribe and replicate the viral RNA genome. In influenza virus, the polymerase is composed of three polypeptides: PB1, PB2 and PA/P3. PB1 houses the polymerase ...	Influenza virus encodes a large, multidomain RNA-dependent RNA polymerase that can both transcribe and replicate the viral RNA genome. In influenza virus, the polymerase is composed of three polypeptides: PB1, PB2 and PA/P3. PB1 houses the polymerase active site, whereas PB2 and PA/P3 contain, respectively, cap-binding [1] and endonuclease domains required for transcription initiation by cap-snatching [2]. This entry represents the CAP binding domain [2].	Domain