The YSIRK-G/S motif of staphylococcal protein A and its role in efficiency of signal peptide processing

Taeok Bae, Olaf Schneewind

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Many surface proteins of pathogenic gram-positive bacteria are linked to the cell wall envelope by a mechanism requiring a C-terminal sorting signal with an LPXTG motif. Surface proteins of Streptococcus pneumoniae harbor another motif, YSIRK-G/S, which is positioned within signal peptides. The signal peptides of some, but not all, of the 20 surface proteins of Staphylococcus aureus carry a YSIRK-G/S motif, whereas those of surface proteins of Listeria monocytogenes and Bacillus anthracis do not. To determine whether the YSIRKG/S motif is required for the secretion or cell wall anchoring of surface proteins, we analyzed variants of staphylococcal protein A, an immunoglobulin binding protein with an LPXTG sorting signal. Deletion of the YSIR sequence or replacement of G or S significantly reduced the rate of signal peptide processing of protein A precursors. In contrast, cell wall anchoring or the functional display of protein A was not affected. The fusion of cell wall sorting signals to reporter proteins bearing N-terminal signal peptides with or without the YSIRK-G/S motif resulted in hybrid proteins that were anchored in a manner similar to that of wild-type protein A. The requirement of the YSIRK-G/S motif for efficient secretion implies the existence of a specialized mode of substrate recognition by the secretion pathway of gram-positive cocci. It seems, however, that this mechanism is not essential for surface protein anchoring to the cell wall envelope.

Original languageEnglish (US)
Pages (from-to)2910-2919
Number of pages10
JournalJournal of Bacteriology
Volume185
Issue number9
DOIs
StatePublished - May 2003
Externally publishedYes

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Staphylococcal Protein A
Protein Sorting Signals
Membrane Proteins
Cell Wall
Bacillus anthracis
Gram-Positive Cocci
Protein Precursors
Sequence Deletion
Secretory Pathway
Listeria monocytogenes
Gram-Positive Bacteria
Streptococcus pneumoniae
Staphylococcus aureus
Immunoglobulins
Carrier Proteins
Proteins

ASJC Scopus subject areas

  • Applied Microbiology and Biotechnology
  • Immunology

Cite this

The YSIRK-G/S motif of staphylococcal protein A and its role in efficiency of signal peptide processing. / Bae, Taeok; Schneewind, Olaf.

In: Journal of Bacteriology, Vol. 185, No. 9, 05.2003, p. 2910-2919.

Research output: Contribution to journalArticle

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