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Deprecated: Implicit conversion from float 233.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Protein+Sci 2015 ; 24 (9): 1440-50 Nephropedia Template TP
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Structural basis of the broadly neutralizing anti-interferon-? antibody rontalizumab #MMPMID26099203
Maurer B; Bosanac I; Shia S; Kwong M; Corpuz R; Vandlen R; Schmidt K; Eigenbrot C
Protein Sci 2015[Sep]; 24 (9): 1440-50 PMID26099203show ga
Interferons-alpha (IFN-?) are the expressed gene products comprising thirteen type I interferons with protein pairwise sequence similarities in the 77?96% range. Three other widely expressed human type I interferons, IFN-?, IFN-? and IFN-? have sequences 29?33%, 29?32% and 56?60% similar to the IFN-?s, respectively. Type I interferons act on immune cells by producing subtly different immune-modulatory effects upon binding to the extracellular domains of a heterodimeric cell-surface receptor composed of IFNAR1 and IFNAR2, most notably anti-viral effects. IFN-? has been used to treat infection by hepatitis-virus type C (HCV) and a correlation between hyperactivity of IFN-?-induced signaling and systemic lupus erythematosis (SLE), or lupus, has been noted. Anti-IFN-? antibodies including rontalizumab have been under clinical study for the treatment of lupus. To better understand the rontalizumab mechanism of action and specificity, we determined the X-ray crystal structure of the Fab fragment of rontalizumab bound to human IFN-?2 at 3Å resolution and find substantial overlap of the antibody and IFNA2 epitopes on IFN-?2.