<p>This small protein has a single S4 domain (<db_xref db="INTERPRO" dbkey="IPR002942"/>); it is also found in bacterial S4 ribosomal proteins, some pseudouridine synthases and tyrosyl-tRNA synthetases.</p><p>The S4 domain may bind RNA. Members of this protein are found almost exclusively in the Firmicutes, and almost invariably just a few nucleotides upstream of the gene for the DNA replication and repair protein RecF. The few members that are not near recF are found instead near dnaA and/or dnaN, the usual neighbours of recF, near the origin of replication. The conserved location suggests a possible role in replication in the Firmicutes lineage.</p>