Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:3.1.4.3 (phospholipase C)
 18,461 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The Gova/b alloantigens are expressed on a 175-kD protein (GP175) on human platelets. Anti-Gov alloantibodies have been implicated in posttransfusion purpura and alloimmune neonatal thrombocytopenia. In this report we characterize the immunochemistry of the alloantigens and identify the platelet protein that expresses the Gov epitopes. Approximately 50% of GP175 containing the Gov epitope was released from platelets treated with phosphatidylinositol-specific phospholipase C, indicating that at least some of this protein exists as a glycosylphosphatidylinositol (GPI)-linked isoform. Radioimmunoprecipitation and immunodepletion studies indicated that the Gova/b alloantigens are expressed on the GPI-anchored CDw109 protein. The Gova/b epitopes were expressed on an extracellular, 120-kD soluble fragment (p120) of CDw109 produced by calcium-dependent protease cleavage. Anti-Gov immunoprecipitates of chymotryptic digests of p120 contained 70- and 52-kD fragments of CDw109. Deglycosylation of native CDw109 had no effect on recognition by Gov alloantisera; however, the epitopes were destroyed after exposure to sodium dodecyl sulfate. Gova/b alloantigens were expressed on platelets and PHA-activated T-cells, cultured human umbilical vein endothelial cells, and by many different tumor cell lines, consistent with the tissue distribution of CDw109.
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PMID:Characterization and localization of the Gova/b alloantigens to the glycosylphosphatidylinositol-anchored protein CDw109 on human platelets. 767 Jan 16

Community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) strains have emerged as serious health threats in the last 15 years. They are associated with large numbers of atopic dermatitis skin and soft tissue infections, but when they originate from skin and mucous membranes, have the capacity to produce sepsis and highly fatal pulmonary infections characterized as necrotizing pneumonia, purpura fulminans, and postviral toxic shock syndrome. This review is a discussion of the emergence of 3 major CA-MRSA organisms, designated CA-MRSA USA400, followed by USA300, and most recently USA200. CA-MRSA USA300 and USA400 isolates and their methicillin-sensitive counterparts (community-associated methicillin-sensitive S aureus) typically produce highly inflammatory cytolysins alpha-toxin, gamma-toxin, delta-toxin (as representative of the phenol soluble modulin family of cytolysins), and Panton Valentine leukocidin. USA300 isolates produce the superantigens enterotoxin-like Q and a highly pyrogenic deletion variant of toxic shock syndrome toxin 1 (TSST-1), whereas USA400 isolates produce the superantigens staphylococcal enterotoxin B or staphylococcal enterotoxin C. USA200 CA-MRSA isolates produce small amounts of cytolysins but produce high levels of TSST-1. In contrast, their methicillin-sensitive S aureus counterparts produce various cytolysins, apparently in part dependent on the niche occupied in the host and levels of TSST-1 expressed. Significant differences seen in production of secreted virulence factors by CA-MRSA versus hospital-associated methicillin-resistant S aureus and community-associated methicillin-sensitive S aureus strains appear to be a result of the need to specialize as the result of energy drains from both virulence factor production and methicillin resistance.
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PMID:Secreted virulence factor comparison between methicillin-resistant and methicillin-sensitive Staphylococcus aureus, and its relevance to atopic dermatitis. 2010 35