Differential roles of individual domains in selection of secretion route of a Streptococcus parasanguinis serine-rich adhesin, Fap1

Qiang Chen, Baiming Sun, Hui Wu, Zhixiang Peng, Paula M. Fives-Taylor

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Fimbria-associated protein 1 (Fap1) is a high-molecular-mass glycosylated surface adhesin required for fimbria biogenesis and biofilm formation in Streptococcus parasanguinis. The secretion of mature Fap1 is dependent on the presence of SecA2, a protein with some homology to, but with a different role from, SecA. The signals that direct the secretion of Fap1 to the SecA2-dependent secretion pathway rather than the SecA-dependent secretion pathway have not yet been identified. In this study, Fap1 variants containing different domains were expressed in both secA2 wild-type and mutant backgrounds and were tested for their ability to be secreted by the SecA- or SecA2-dependent pathway. The presence or absence of the cell wall anchor domain (residues 2531 to 2570) at the C terminus did not alter the selection of the Fap1 secretion route. The Fap1 signal peptide (residues 1 to 68) was sufficient to support the secretion of a heterologous protein via the SecA-dependent pathway, suggesting that the signal peptide was sufficient for recognition by the SecA-dependent pathway. The minimal sequences of Fap1 required for the SecA2-dependent pathway included the N-terminal signal peptide, nonrepetitive region I (residues 69 to 102), and part of nonrepetitive region II (residues 169 to 342). The two serine-rich repeat regions (residues 103 to 168 and 505 to 2530) were not required for Fap1 secretion. However, they were both involved in the specific inhibition of Fap1 secretion via the SecA-dependent pathway.

Original languageEnglish (US)
Pages (from-to)7610-7617
Number of pages8
JournalJournal of bacteriology
Volume189
Issue number21
DOIs
StatePublished - Nov 2007
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Fingerprint Dive into the research topics of 'Differential roles of individual domains in selection of secretion route of a Streptococcus parasanguinis serine-rich adhesin, Fap1'. Together they form a unique fingerprint.

Cite this