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2015 ; 112
(23
): 7237-42
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pH-Dependent recognition of apoptotic and necrotic cells by the human dendritic
cell receptor DEC205
#MMPMID26039988
Cao L
; Shi X
; Chang H
; Zhang Q
; He Y
Proc Natl Acad Sci U S A
2015[Jun]; 112
(23
): 7237-42
PMID26039988
show ga
Dendritic cells play important roles in regulating innate and adaptive immune
responses. DEC205 (CD205) is one of the major endocytotic receptors on dendritic
cells and has been widely used for vaccine generation against viruses and tumors.
However, little is known about its structure and functional mechanism. Here we
determine the structure of the human DEC205 ectodomain by cryoelectron
microscopy. The structure shows that the 12 extracellular domains form a compact
double ring-shaped conformation at acidic pH and become extended at basic pH.
Biochemical data indicate that the pH-dependent conformational change of DEC205
is correlated with ligand binding and release. DEC205 only binds to apoptotic and
necrotic cells at acidic pH, whereas live cells cannot be recognized by DEC205 at
either acidic or basic conditions. These results suggest that DEC205 is an immune
receptor that recognizes apoptotic and necrotic cells specifically through a
pH-dependent mechanism.