Neisseria gonorrhoeae PilA is an FtsY homolog

Cindy Grove Arvidson, Ted Powers, Peter Walter, Magdalene "Maggie" So

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The pilA gene of Neisseria gonorrhoeae was initially identified in a screen for transcriptional regulators of pilE, the expression locus for pili, the major structural component of gonococcal pili. The predicted protein sequence for PilA has significant homology to two GTPases of the mammalian signal recognition particle (SRP), SRP54 and SRα. Homologs of SRP54 and SRα were subsequently identified in bacteria (Ffh and FtsY, respectively) and appear to form an SRP-like apparatus in prokaryotes. Of the two proteins, PilA is the most similar to FtsY (47% identical and 67% similar at the amino acid level). Like FtsY, PilA is essential for viability and hydrolyzes GTP. The similarities between PilA and the bacterial FtsY led us to ask whether PilA might function as the gonococcal FtsY. In this work, we show that overproduction of PilA in Escherichia coli leads to an accumulation of pre- β-lactamase, similar to previous observations with other bacterial SRP components. Low-level expression of pilA in an ftsY conditional mutant can complement the ftsY mutation and restore normal growth to this strain under nonpermissive conditions. In addition, purified PilA can replace FtsY in an in vitro translocation assay using purified E. coli SRP components. A PilA mutant that is severely affected in its GTPase activity cannot replace FtsY in vivo or in vitro. However, overexpression of the GTPase mutant leads to the accumulation of pre-β-lactamase, suggesting that the mutant protein may interact with the SRP apparatus to affect protein maturation. Taken together, these results show that the gonococcal PilA is an FtsY homolog and that the GTPase activity is necessary for its function.

Original languageEnglish (US)
Pages (from-to)731-739
Number of pages9
JournalJournal of Bacteriology
Volume181
Issue number3
StatePublished - Feb 1999
Externally publishedYes

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Signal Recognition Particle
Neisseria gonorrhoeae
GTP Phosphohydrolases
Escherichia coli
Proteins
Mutant Proteins
Guanosine Triphosphate
Bacteria
Amino Acids
Mutation
Growth
Genes

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Immunology

Cite this

Arvidson, C. G., Powers, T., Walter, P., & So, M. M. (1999). Neisseria gonorrhoeae PilA is an FtsY homolog. Journal of Bacteriology, 181(3), 731-739.

Neisseria gonorrhoeae PilA is an FtsY homolog. / Arvidson, Cindy Grove; Powers, Ted; Walter, Peter; So, Magdalene "Maggie".

In: Journal of Bacteriology, Vol. 181, No. 3, 02.1999, p. 731-739.

Research output: Contribution to journalArticle

Arvidson, CG, Powers, T, Walter, P & So, MM 1999, 'Neisseria gonorrhoeae PilA is an FtsY homolog', Journal of Bacteriology, vol. 181, no. 3, pp. 731-739.
Arvidson CG, Powers T, Walter P, So MM. Neisseria gonorrhoeae PilA is an FtsY homolog. Journal of Bacteriology. 1999 Feb;181(3):731-739.
Arvidson, Cindy Grove ; Powers, Ted ; Walter, Peter ; So, Magdalene "Maggie". / Neisseria gonorrhoeae PilA is an FtsY homolog. In: Journal of Bacteriology. 1999 ; Vol. 181, No. 3. pp. 731-739.
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