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. 1993 Aug;175(15):4885–4894. doi: 10.1128/jb.175.15.4885-4894.1993

Cloning and characterization of a Bacillus subtilis gene encoding a homolog of the 54-kilodalton subunit of mammalian signal recognition particle and Escherichia coli Ffh.

K Honda 1, K Nakamura 1, M Nishiguchi 1, K Yamane 1
PMCID: PMC204942  PMID: 8335643

Abstract

By using a DNA fragment of Escherichia coli ffh as a probe, the Bacillus subtilis ffh gene was cloned. The complete nucleotide sequence of the cloned DNA revealed that it contained three open reading frames (ORFs). Their order in the region, given by the gene product, was suggested to be ORF1-Ffh-S16, according to their similarity to the gene products of E. coli, although ORF1 exhibited no significant identity with any other known proteins. The orf1 and ffh genes are organized into an operon. Genetic mapping of the ffh locus showed that the B. subtilis ffh gene is located near the pyr locus on the chromosome. The gene product of B. subtilis ffh shared 53.9 and 32.6% amino acid identity with E. coli Ffh and the canine 54-kDa subunit of signal recognition particle, respectively. Although there was low amino acid identity with the 54-kDa subunit of mammalian signal recognition particle, three GTP-binding motifs in the NH2-terminal half and amphipathic helical cores in the COOH-terminus were conserved. The depletion of ffh in B. subtilis led to growth arrest and drastic morphological changes. Furthermore, the translocation of beta-lactamase and alpha-amylase under the depleted condition was also defective.

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