YbxF and YlxQ are bacterial homologs of L7Ae and bind K-turns but not K-loops.
Baird, N.J., Zhang, J., Hamma, T., Ferre-D'Amare, A.R.(2012) RNA 18: 759-770
- PubMed: 22355167 
- DOI: 10.1261/rna.031518.111
- Primary Citation of Related Structures:  
3V7E, 3V7Q - PubMed Abstract: 
The archaeal protein L7Ae and eukaryotic homologs such as L30e and 15.5kD comprise the best characterized family of K-turn-binding proteins. K-turns are an RNA motif comprised of a bulge flanked by canonical and noncanonical helices. They are widespread in cellular RNAs, including bacterial gene-regulatory RNAs such as the c-di-GMP-II, lysine, and SAM-I riboswitches, and the T-box ...