Phenol-soluble modulins (PSMs) are a family of small proteins, that carry out a variety of functions, including acting as toxins, assisting in biofilm formation, and colony spreading. PSMs are produced by Staphylococcus bacteria including Methicillin-resistant Staphylococcus aureus (MRSA), and Staphylococcus epidermidis. Many PSMs are encoded within the core genome and can play an important virulence factor. PSMs were first discovered in S. epidermidis by Seymour Klebanoff and via hot-phenol extraction and were described as a pro-inflammatory complex of three peptides. Since their initial discovery, numerous roles of PSMs have been identified. However, due in part to the small size of many PSMs, they have largely gone unnoticed until recent years.
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| - Phenol-soluble modulins (PSMs) are a family of small proteins, that carry out a variety of functions, including acting as toxins, assisting in biofilm formation, and colony spreading. PSMs are produced by Staphylococcus bacteria including Methicillin-resistant Staphylococcus aureus (MRSA), and Staphylococcus epidermidis. Many PSMs are encoded within the core genome and can play an important virulence factor. PSMs were first discovered in S. epidermidis by Seymour Klebanoff and via hot-phenol extraction and were described as a pro-inflammatory complex of three peptides. Since their initial discovery, numerous roles of PSMs have been identified. However, due in part to the small size of many PSMs, they have largely gone unnoticed until recent years. (en)
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| - Phenol-soluble modulins (PSMs) are a family of small proteins, that carry out a variety of functions, including acting as toxins, assisting in biofilm formation, and colony spreading. PSMs are produced by Staphylococcus bacteria including Methicillin-resistant Staphylococcus aureus (MRSA), and Staphylococcus epidermidis. Many PSMs are encoded within the core genome and can play an important virulence factor. PSMs were first discovered in S. epidermidis by Seymour Klebanoff and via hot-phenol extraction and were described as a pro-inflammatory complex of three peptides. Since their initial discovery, numerous roles of PSMs have been identified. However, due in part to the small size of many PSMs, they have largely gone unnoticed until recent years. Although PSMs are present in every Staphylococcal species, there is still diversity. Staphylococcus aureus encodes eight different PSMs, PSMα 1-4, PSMβ 1-2, PSMγ (Also known as δ-toxin in S. aureus), and PSM-mec. While Staphylococcus epidermidis encodes one PSMα, PSMβ 1-2, PSMγ, and PSM-mec. In addition S. epidermidis encodes two unique PSMs, PSMδ and PSMε. PSM-mec is one of the most widely encoded PSM among Staphylococcal species. Which may be in part due to PSM-mec being encoded on the mecI mobile genetic element. (en)
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