This family of proteins is functionally uncharacterised. This family of proteins is found in cyanobacteria. Proteins in this family are approximately 90 amino acids in length. A member of this family, the ssr1528 gene was found to be regulated by an sRNA NsiR4 [1]. In addition the expression of that gene was repressed under conditions of nitrogen depletion suggesting it may have a role related to cellular nitrogen status [1].

1: The sRNA NsiR4 is involved in nitrogen assimilation control in cyanobacteria by targeting glutamine synthetase inactivating factor IF7. Klahn S, Schaal C, Georg J, Baumgartner D, Knippen G, Hagemann M, Muro-Pastor AM, Hess WR; Proc Natl Acad Sci U S A. 2015;112:E6243-E6252. PMID:26494284