This domain family is found in bacteria and eukaryotes, and is typically between 179 and 201 amino acids in length. The family is found in association with Pfam:PF00037. LdpA (light-dependent period) plays a role in controlling the redox state in cyanobacteria to modulate its. circadian clock. LdpA is a protein with Iron-Sulfur cluster-binding motifs.

1: ldpA encodes an iron-sulfur protein involved in light-dependent modulation of the circadian period in the cyanobacterium Synechococcus elongatus PCC 7942. Katayama M, Kondo T, Xiong J, Golden SS; J Bacteriol. 2003;185:1415-1422. PMID:12562813