This Pfam family contains the sigma-54 modulation protein family and the S30AE family of ribosomal proteins which includes the light- repressed protein (lrtA) (Swiss:P47908) [1].

1: A light-repressed transcript found in Synechococcus PCC 7002 is similar to a chloroplast-specific small subunit ribosomal protein and to a transcription modulator protein associated with sigma 54. Tan X, Varughese M, Widger WRM; J Biol Chem 1994;269:20905-20912. PMID:8063707