s-Candidatus Izimaplasma bacterium HR1 Octapeptide-1 is a single chain protein synthetically produced based on a sequence from Holliday junction branch migration complex subunit RuvA which is found in the microorganism, Candidatus izimaplasma bacterium HR1. It consists of arginine, glutamic acid, histidine, isoleucine, tyrosine and valine. Holliday junction branch migration complex subunit RuvA contains 185 amino acids which may contain disulfide bonds and/or glycosylation and consists of the proper sequence of the 20 amino acids.