Annotations: 3L1F

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Hsp20 chaperone-like	8089921	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	e3l1fA1	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)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	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	Alpha-crystallin A chain	unfolded protein binding protein binding binding structural molecule activity structural constituent of eye lens cation binding ion binding metal ion binding small molecule binding identical protein binding	regulation of growth regulation of biological process regulation of cellular process regulation of cellular component organization biological regulation growth positive regulation of biological process positive regulation of cell growth regulation of cell growth cell growth cellular component organization positive regulation of growth cellular process cellular component organization or biogenesis regulation of growth regulation of biological process regulation of cellular process regulation of cellular component organization biological regulation growth positive regulation of biological process positive regulation of cell growth regulation of cell growth cell growth cellular component organization positive regulation of growth cellular process cellular component organization or biogenesis positive regulation of cellular process regulation of protein stability regulation of biological quality protein stabilization tubulin complex assembly cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly developmental process multicellular organismal process sensory organ development eye development animal organ development visual system development multicellular organism development camera-type eye development anatomical structure development sensory system development lens development in camera-type eye system development negative regulation of programmed cell death regulation of apoptotic process negative regulation of biological process regulation of programmed cell death cell death negative regulation of apoptotic process negative regulation of cellular process apoptotic process programmed cell death negative regulation of intracellular transport regulation of localization cellular localization transport regulation of transport intracellular transport negative regulation of transport establishment of localization localization regulation of cellular localization establishment of localization in cell regulation of intracellular transport response to light stimulus response to stimulus response to radiation response to abiotic stimulus response to UV response to UV-A cellular developmental process cell development cell morphogenesis epithelial cell differentiation eye morphogenesis lens morphogenesis in camera-type eye cell differentiation animal organ morphogenesis camera-type eye morphogenesis lens fiber cell morphogenesis epithelium development tissue development lens fiber cell development anatomical structure morphogenesis epithelial cell development sensory organ morphogenesis lens fiber cell differentiation response to decreased oxygen levels response to hypoxia response to stress response to oxygen levels sensory perception of light stimulus system process sensory perception nervous system process visual perception embryonic eye morphogenesis embryo development embryonic camera-type eye development embryonic organ development embryonic organ morphogenesis embryonic morphogenesis embryonic camera-type eye morphogenesis regulation of biosynthetic process negative regulation of metabolic process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression negative regulation of gene expression biosynthetic process negative regulation of biosynthetic process negative regulation of macromolecule biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process negative regulation of macromolecule metabolic process organelle organization mitochondrion organization actin cytoskeleton organization actin filament organization actin filament-based process supramolecular fiber organization cytoskeleton organization response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species response to heat response to temperature stimulus microtubule-based process apoptotic process involved in development apoptotic process involved in morphogenesis	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen cellular anatomical structure intracellular anatomical structure cytoplasm cytosol membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen protein-containing complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002068	Alpha crystallin/Hsp20 domain	Domain
A	IPR003090	Alpha-crystallin, N-terminal	Domain
A	IPR055269	Alpha crystallin/Heat shock protein Hsp-16.1/Hsp-16.2	Family
A	IPR008978	HSP20-like chaperone	Homologous Superfamily
A	IPR001436	Alpha crystallin/Small heat shock protein, animal type	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.