Annotations: 2WVO

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	HeLo-like	8050043	4006740	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	HET-s N-terminal domain-like	8053462	3002191	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	HET-s N-terminal domain-like	8053462	3002191	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	HeLo	e2wvoA1	A: alpha bundles	X: HET-S N-terminal domain (From Topology)	H: HET-S N-terminal domain (From Topology)	T: HET-S N-terminal domain	F: HeLo	ECOD (1.6)
B	HeLo	e2wvoB1	A: alpha bundles	X: HET-S N-terminal domain (From Topology)	H: HET-S N-terminal domain (From Topology)	T: HET-S N-terminal domain	F: HeLo	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.1020	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Prion-inhibition and propagation, HeLo domain	CATH (4.3.0)
B	1.20.120.1020	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Prion-inhibition and propagation, HeLo domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF14479	Prion-inhibition and propagation (HeLo)	Prion-inhibition and propagation	This N-terminal region, HeLo, has a prion-inhibitory effect in cis on its own prion-forming domain (PFD) and in trans on HET-s prion propagation [1]. The domain is found exclusively in the fungal kingdom. Its structure, as it occurs in the HET-s/HET- ...	This N-terminal region, HeLo, has a prion-inhibitory effect in cis on its own prion-forming domain (PFD) and in trans on HET-s prion propagation [1]. The domain is found exclusively in the fungal kingdom. Its structure, as it occurs in the HET-s/HET-S proteins, consists of two bundles of alpha-helices that pack into a single globular domain [1]. The domain boundary determined from its structure and from protease-resistance experiments overlaps with the C-terminal prion-forming domain of HET-s (PF11558 [2]. The HeLo domains of HET-s and HET-S are very similar and their few differences (and not the prion-forming domains) determine the compatibility-phenotype of the fungi in which the proteins are expressed. The mechanism of the HeLo domain-function in heterokaryon-incompatibility is still under investigation, however the HeLo domain is found in similar protein architectures as other cell death and apoptosis-inducing domains. The only other HeLo protein to which a function has been associated is LopB from L. maculans [3]. Although its specific role in L. maculans is unknown, LopB- mutants have impaired ability to form lesions on oilseed rape. The HeLo domain is not related to the HET domain (PF06985) which is another domain involved in heterokaryon incompatibility.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	SMALL S PROTEIN	identical protein binding protein binding binding	cellular process apoptotic process cell death programmed cell death	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR038305	HeLo domain superfamily	Homologous Superfamily
A, B	IPR021084	Het-s prion-forming domain	Domain
A, B	IPR029498	Prion-inhibition and propagation, HeLo domain	Domain

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.