Annotations: 4K7B

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF18240	e4k7bA1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Oxygen-evolving enhancer protein 3 (From Topology)	T: Oxygen-evolving enhancer protein 3	F: PF18240	ECOD (1.6)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.1740	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Sodium ion translocating NADH-quinone reductase subunit C-like	CATH (4.3.0)

Chains	Accession	Name	Description	Comments	Source
A	PF18240	Photosystem II Psb31 protein (PSII_Pbs31)	Photosystem II Psb31 protein	This domain is Psb31, an extrinsic protein found in photosystem II (PSII) present in Chaetoceros gracilis. Photosystem II (PSII) is a multisubunit, membrane protein complex located in the thylakoid membranes of oxygenic photosynthetic organisms from ...	This domain is Psb31, an extrinsic protein found in photosystem II (PSII) present in Chaetoceros gracilis. Photosystem II (PSII) is a multisubunit, membrane protein complex located in the thylakoid membranes of oxygenic photosynthetic organisms from cyanobacteria to higher plants. The four helices in the N-terminal domain are arranged in an up-down-up-down fold and are similar in structure to PsbQ protein in Spinach, despite low sequence homology [1].	Domain