کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5916805 1163756 2014 16 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tuf of Streptococcus pneumoniae is a surface displayed human complement regulator binding protein
ترجمه فارسی عنوان
توف استرپتوکوک پنومونیه سطحی است که نشان دهنده پروتئین گیرنده تنظیمکننده پروتئین انسان است
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شناسی مولکولی
چکیده انگلیسی


- In this manuscript we identify and describe a new complement evasion protein of the important Gram negative pathogen Streptococcus pneumoniae.
- We identify an relevant pneumoccoccal immune evasion protein and virulence factor, and characterize the binding characteristics for several human complement and immune regulators.
- In short we identify elongation factor Tuf (Tuf) as a new pneumococcal immune evasion protein and virulence factor that binds several human immune inhibitors.

Streptococcus pneumoniae is a Gram-positive bacterium, causing acute sinusitis, otitis media, and severe diseases such as pneumonia, bacteraemia, meningitis and sepsis. Here we identify elongation factor Tu (Tuf) as a new Factor H binding protein of S. pneumoniae. The surface protein PspC which also binds a series of other human immune inhibitors, was the first identified pneumococcal Factor H binding protein of S. pneumoniae. Pneumococcal Tuf, a 55 kDa pneumococcal moonlighting protein which is displayed on the surface of pneumococci, is also located in the cytoplasm and is detected in the culture supernatant. Tuf binds the human complement inhibitors Factor H, FHL-1, CFHR1 and also the proenzyme plasminogen. Factor H and FHL-1 bound to Tuf, retain their complement regulatory activities. Similarly, plasminogen bound to Tuf was accessible for the activator uPA and activated plasmin cleaved the synthetic chromogenic substrate S-2251 as well as the natural substrates fibrinogen and the complement proteins C3 and C3b. Taken together, Tuf of S. pneumoniae is a new multi-functional bacterial virulence factor that helps the pathogen in complement escape and likely also in ECM degradation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular Immunology - Volume 62, Issue 1, November 2014, Pages 249-264
نویسندگان
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