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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 J+Immunol
2016 ; 196
(5
): 2309-18
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Molecular Basis of the Functional Differences between Soluble Human Versus Murine
MD-2: Role of Val135 in Transfer of Lipopolysaccharide from CD14 to MD-2
#MMPMID26826249
Va?l J
; Oblak A
; Peternelj TT
; Klett J
; Martín-Santamaría S
; Gioannini TL
; Weiss JP
; Jerala R
J Immunol
2016[Mar]; 196
(5
): 2309-18
PMID26826249
show ga
Myeloid differentiation factor 2 (MD-2) is an extracellular protein, associated
with the ectodomain of TLR4, that plays a critical role in the recognition of
bacterial LPS. Despite high overall structural and functional similarity, human
(h) and murine (m) MD-2 exhibit several species-related differences. hMD-2 is
capable of binding LPS in the absence of TLR4, whereas mMD-2 supports LPS
responsiveness only when mMD-2 and mTLR4 are coexpressed in the same cell.
Previously, charged residues at the edge of the LPS binding pocket have been
attributed to this difference. In this study, site-directed mutagenesis was used
to explore the hydrophobic residues within the MD-2 binding pocket as the source
of functional differences between hMD-2 and mMD-2. Whereas decreased
hydrophobicity of residues 61 and 63 in the hMD-2 binding pocket retained the
characteristics of wild-type hMD-2, a relatively minor change of valine to
alanine at position 135 completely abolished the binding of LPS to the hMD-2
mutant. The mutant, however, retained the LPS binding in complex with TLR4 and
also cell activation, resulting in a murine-like phenotype. These results were
supported by the molecular dynamics simulation. We propose that the residue at
position 135 of MD-2 governs the dynamics of the binding pocket and its ability
to accommodate lipid A, which is allosterically affected by bound TLR4.