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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nat+Commun
2017 ; 8
(1
): 1692
Nephropedia Template TP
gab.com Text
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English Wikipedia
Structure of human immunoproteasome with a reversible and noncompetitive
inhibitor that selectively inhibits activated lymphocytes
#MMPMID29167449
Santos RLA
; Bai L
; Singh PK
; Murakami N
; Fan H
; Zhan W
; Zhu Y
; Jiang X
; Zhang K
; Assker JP
; Nathan CF
; Li H
; Azzi J
; Lin G
Nat Commun
2017[Nov]; 8
(1
): 1692
PMID29167449
show ga
Proteasome inhibitors benefit patients with multiple myeloma and B cell-dependent
autoimmune disorders but exert toxicity from inhibition of proteasomes in other
cells. Toxicity should be minimized by reversible inhibition of the
immunoproteasome ?5i subunit while sparing the constitutive ?5c subunit. Here we
report ?5i-selective inhibition by asparagine-ethylenediamine (AsnEDA)-based
compounds and present the high-resolution cryo-EM structural analysis of the
human immunoproteasome. Despite inhibiting noncompetitively, an AsnEDA inhibitor
binds the active site. Hydrophobic interactions are accompanied by hydrogen
bonding with ?5i and ?6 subunits. The inhibitors are far more cytotoxic for
myeloma and lymphoma cell lines than for hepatocarcinoma or non-activated
lymphocytes. They block human B-cell proliferation and promote apoptotic cell
death selectively in antibody-secreting B cells, and to a lesser extent in
activated human T cells. Reversible, ?5i-selective inhibitors may be useful for
treatment of diseases involving activated or neoplastic B cells or activated T
cells.