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2016 ; 24
(9
): 1599-605
Nephropedia Template TP
gab.com Text
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English Wikipedia
Structure of the Dual-Mode Wnt Regulator Kremen1 and Insight into Ternary Complex
Formation with LRP6 and Dickkopf
#MMPMID27524201
Zebisch M
; Jackson VA
; Zhao Y
; Jones EY
Structure
2016[Sep]; 24
(9
): 1599-605
PMID27524201
show ga
Kremen 1 and 2 have been identified as co-receptors for Dickkopf (Dkk) proteins,
hallmark secreted antagonists of canonical Wnt signaling. We present here three
crystal structures of the ectodomain of human Kremen1 (KRM1ECD) at resolutions
between 1.9 and 3.2 Å. KRM1ECD emerges as a rigid molecule with tight
interactions stabilizing a triangular arrangement of its Kringle, WSC, and CUB
structural domains. The structures reveal an unpredicted homology of the WSC
domain to hepatocyte growth factor. We further report the general architecture of
the ternary complex formed by the Wnt co-receptor Lrp5/6, Dkk, and Krm,
determined from a low-resolution complex crystal structure between
?-propeller/EGF repeats (PE) 3 and 4 of the Wnt co-receptor LRP6 (LRP6PE3PE4),
the cysteine-rich domain 2 (CRD2) of DKK1, and KRM1ECD. DKK1CRD2 is sandwiched
between LRP6PE3 and KRM1Kringle-WSC. Modeling studies supported by surface
plasmon resonance suggest a direct interaction site between Krm1CUB and Lrp6PE2.
|Amino Acid Motifs
[MESH]
|Binding Sites
[MESH]
|Cloning, Molecular
[MESH]
|Crystallography, X-Ray
[MESH]
|Gene Expression
[MESH]
|HEK293 Cells
[MESH]
|Humans
[MESH]
|Intercellular Signaling Peptides and Proteins/*chemistry/genetics/metabolism
[MESH]
|Low Density Lipoprotein Receptor-Related Protein-6/*chemistry/genetics/metabolism
[MESH]