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Substance Name: Protein A (Staphylococcus aureus strain Cowan I)
RN: 91932-65-9


  • A protein present in the cell wall of most Staphylococcus aureus strains. The protein selectively binds to the Fc region of human normal and myeloma-derived IMMUNOGLOBULIN G. It elicits antibody activity and may cause hypersensitivity reactions due to histamine release; has also been used as cell surface antigen marker and in the clinical assessment of B lymphocyte function.
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Names and Synonyms

MeSH Heading

  • Staphylococcal protein A


  • CCRIS 4112
  • EINECS 295-242-9

Systematic Names

  • Protein A
  • Protein A (Staphylococcus aureus strain Cowan I)

Registry Numbers

CAS Registry Number

  • 91932-65-9

System Generated Number

  • 0091932659