Annotations: 4YDZ

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Hsp20 chaperone-like	8089927	3001242	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Hsp20 chaperone-like	8089927	3001242	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Hsp20 chaperone-like	8089927	3001242	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Hsp20 chaperone-like	8089927	3001242	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	HSP20	e4ydzA1	A: beta sandwiches	X: HSP20-like	H: HSP20-like chaperones (From Topology)	T: HSP20-like chaperones	F: HSP20	ECOD (1.6)
B	HSP20	e4ydzB1	A: beta sandwiches	X: HSP20-like	H: HSP20-like chaperones (From Topology)	T: HSP20-like chaperones	F: HSP20	ECOD (1.6)
C	HSP20	e4ydzC1	A: beta sandwiches	X: HSP20-like	H: HSP20-like chaperones (From Topology)	T: HSP20-like chaperones	F: HSP20	ECOD (1.6)
D	HSP20	e4ydzD1	A: beta sandwiches	X: HSP20-like	H: HSP20-like chaperones (From Topology)	T: HSP20-like chaperones	F: HSP20	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	2.60.40.790	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
B	2.60.40.790	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
C	2.60.40.790	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)
D	2.60.40.790	Mainly Beta	Sandwich	Immunoglobulin-like		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF00011	Hsp20/alpha crystallin family (HSP20)	Hsp20/alpha crystallin family	Not only do small heat-shock-proteins occur in eukaryotes and prokaryotes but they have also now been shown to occur in cyanobacterial phages as well as their bacterial hosts [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	Stress-induced protein 1	unfolded protein binding protein binding binding	protein refolding primary metabolic process gene expression macromolecule biosynthetic process protein maturation protein folding biosynthetic process metabolic process cellular process protein metabolic process macromolecule metabolic process multicellular organismal process determination of adult lifespan developmental process protein refolding primary metabolic process gene expression macromolecule biosynthetic process protein maturation protein folding biosynthetic process metabolic process cellular process protein metabolic process macromolecule metabolic process multicellular organismal process determination of adult lifespan developmental process multicellular organism development embryo development ending in birth or egg hatching anatomical structure development embryo development response to stimulus response to stress response to heat response to abiotic stimulus response to temperature stimulus	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle intracellular organelle organelle nucleus intracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR002068	Alpha crystallin/Hsp20 domain	Domain
A, B, C, D	IPR001436	Alpha crystallin/Small heat shock protein, animal type	Family
A, B, C, D	IPR008978	HSP20-like chaperone	Homologous Superfamily

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.