Alpha-crystallin A chain - P02489 (CRYAA_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Contributes to the transparency and refractive index of the lens (PubMed:18302245). In its oxidized form (absence of intramolecular disulfide bond), acts as a chaperone, preventing aggregation of various proteins under a wide range of stress conditions (PubMed:22120592, PubMed:31792453). Required for the correct formation of lens intermediate filaments as part of a complex composed of BFSP1, BFSP2 and CRYAA (PubMed:28935373). UniProt
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Subunit Structure
Heteropolymer composed of three CRYAA and one CRYAB subunits (PubMed:20836128). Inter-subunit bridging via zinc ions enhances stability, which is crucial as there is no protein turn over in the lens (PubMed:22890888). Can also form homodimers and homotetramers (dimers of dimers) which serve as the building blocks of homooligomers (PubMed:17909943, PubMed:31792453). Within homooligomers, the zinc-binding motif is created from residues of 3 different molecules. His-100 and Glu-102 from one molecule are ligands of the zinc ion, and His-107 and His-154 residues from additional molecules complete the site with tetrahedral coordination geometry (By similarity). Part of a complex required for lens intermediate filament formation composed of BFSP1, BFSP2 and CRYAA (PubMed:28935373). UniProt
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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