Information obtained from PDB's Chemical Component Dictionary
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[(2R,3S,4S)-5-(7,8-dimethyl-2,4-dioxo-benzo[g]pteridin-10-yl)-2,3,4-trihydroxy-pentyl] dihydrogen phosphate

Proceedings of the National Academy of Sciences of the United States of America
Structural basis of photosensitivity in a bacterial light-oxygen-voltage/helix-turn-helix (LOV-HTH) DNA-binding protein.

EL222 = Erythrobactor litoralis HTCC2594 protein, 222aa total. GB incorrectly annotated to function and start Met aa.

first three residues (GEF) are vector-derived; remainder of sequence are residues 14-222 of protein

Crystal Structure Of Light Activated Transcription Factor El222 From Erythrobacter Litoralis

sensor histidine kinase [Erythrobacter litoralis HTCC2594]

histidine kinase [Erythrobacter litoralis]

Delaglio, Grzesiek, Vuister, Zhu, Pfeifer and Bax