Family based of PDB:3B5P encoded by ZP_00108531 from nitrogen-fixing cyanobacterium Nostoc punctiforme pcc 73102 is a CADD-like protein of unknown function. Superposition between protein structures encoded by CT610 from Chlamydia trachomatis (PDB code 1rwc), pyrroloquinolinquinone synthase C (PqqC, PDB code 1otv) and ZP_00108531 revealed that putative active sites in CT610 and ZP_00108531 are identical. ( REF: http://www.topsan.org/Proteins/JCSG/3B5P).