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ChaN is an iron-regulated, heme-binding protein This family represents a domain found in ChaN, a heme-binding/iron-regulated lipoprotein from Campylobacter jejuni. ChaN, possibly involved in the uptake of heme-iron, contains a pair of cofacial heme groups situated between two ChaN monomers. A single tyrosine residue contacts the heme-bound iron atom while the heme-binding regions of each monomer also have contacts to the heme in the complementary monomer. ChaN presumably associates with an outer membrane-associated receptor, ChaR. Campylobacter jejuni is an important cause of food-borne illness, and is dependent on iron uptake from the host. ChaN like proteins are related to the Tiki/TraB like family of proteases. Proteins containing this domain also include protein reticulata-related from Arabidopsis which may play a role in leaf development.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",