| 2002 |
KREMEN1 and KREMEN2 are high-affinity receptors for the Wnt antagonist DKK1. KREMEN2 forms a ternary complex with DKK1 and LRP6, inducing rapid endocytosis and removal of the Wnt co-receptor LRP6 from the plasma membrane, thereby blocking Wnt/beta-catenin signaling. |
Co-immunoprecipitation, cell surface binding assays, endocytosis assays, functional Wnt reporter assays, Xenopus embryo overexpression |
Nature |
High |
12050670
|
| 2002 |
Kremen1 and Kremen2 functionally interact with DKK1 to regulate anteroposterior patterning of the CNS in Xenopus; morpholino knockdown of Krm1/2 leads to anterior neural defects, and Krm2 synergizes with dkk1 in inhibiting Wnt/LRP6 signaling in axis duplication assays. |
Antisense morpholino knockdown, axis duplication assays, rescue experiments with inhibitory anti-Dkk1 antibodies, Xenopus embryo overexpression |
Development (Cambridge, England) |
High |
12421700
|
| 2001 |
KREMEN1 (Kremen) is a type-I transmembrane protein containing a kringle domain, a WSC domain, and CUB domains in the extracellular region, with no conserved intracellular signaling motif; its mRNA increases during embryonic development and cellular differentiation. |
Molecular cloning, domain analysis, in situ hybridization, northern blot |
Biochimica et biophysica acta |
Medium |
11267660
|
| 2007 |
In the absence of DKK proteins, Kremen2 promotes LRP6 cell-surface localization and stimulates LRP6-mediated Wnt/beta-catenin signaling; Krm2 knockdown specifically reduces LRP6 protein levels in neural crest explants, indicating a positive role for Kremens in Wnt signaling when Dkks are absent. |
Morpholino knockdown, overexpression, cell surface LRP6 localization assays, Wnt reporter assays, Xenopus neural crest induction |
Development (Cambridge, England) |
High |
17978005
|
| 2008 |
DKK1 residues Arg197, Ser198, and Lys232 are specifically required for binding to Kremen (but not LRP6); these Kremen-binding residues lie on the opposite face of DKK1 from the LRP6-binding surface. Kremen is dispensable for DKK1-mediated Wnt antagonism unless cells express high levels of LRP5/6. |
Site-directed mutagenesis of DKK1, binding assays, Wnt reporter assays, co-expression experiments |
The Journal of biological chemistry |
High |
18502762
|
| 2006 |
Kremen1 knockout mice exhibit severe defects in thymic cortical architecture, with loss of defined cortical and medullary regions and failure of thymic epithelial cells to mature beyond the immature K5+K8+ stage; krm1-/- TEC lines show a 2-fold increase in canonical Wnt signaling by TOPFlash assay. |
Krm1 knockout mouse, histology, immunofluorescence, FACS, TOPFlash Wnt reporter assay |
Clinical & developmental immunology |
High |
17162372
|
| 2012 |
KREMEN1 is internalized from the cell surface via clathrin-mediated endocytosis, dependent on an atypical dileucine motif (DXXXLV) in its cytoplasmic tail; mutation of LV to AA blocked internalization, and inhibition of AP-2 or clathrin also blocked Kremen1 internalization. |
Internalization assays, site-directed mutagenesis of dileucine motif, AP-2 siRNA knockdown, clathrin inhibitor (pitstop 2), cell surface assays |
PloS one |
High |
23251700
|
| 2015 |
Kremen1 functions as a dependence receptor, triggering cell death (apoptosis) in the absence of its ligand DKK1; a specific motif in the cytoplasmic tail of Kremen1, conserved only in placental mammals, is required for apoptosis induction and is distinct from the Wnt-inhibitory function. Cancer-associated somatic mutations in Kremen1 can impair its pro-apoptotic activity. |
Whole embryo culture, Wnt activity assays, mutagenesis of cytoplasmic tail, phylogenetic analysis, apoptosis assays |
Cell death and differentiation |
High |
26206087
|
| 2016 |
Crystal structures of the ectodomain of human KREMEN1 at 1.9–3.2 Å resolution reveal a rigid triangular arrangement of Kringle, WSC, and CUB domains; the WSC domain is homologous to hepatocyte growth factor. A low-resolution ternary complex structure shows DKK1-CRD2 sandwiched between LRP6PE3 and KRM1-Kringle-WSC; surface plasmon resonance and modeling suggest a direct interaction between Krm1-CUB and Lrp6-PE2. |
X-ray crystallography, surface plasmon resonance, complex crystal structure |
Structure (London, England : 1993) |
High |
27524201
|
| 2016 |
KREMEN1 mutation p.F209S (in the WSC domain) causes autosomal recessive ectodermal dysplasia with oligodontia in humans, implicating Kremen1-mediated Wnt signaling regulation in ectodermal and dental development. |
Exome sequencing, genotyping of 56 relatives in 4 consanguineous families, mutation mapping to conserved WSC domain |
European journal of human genetics : EJHG |
Medium |
27049303
|
| 2016 |
Kremen1 is expressed in cochlear prosensory cells during development and in supporting cells of the adult mouse cochlea; gain- and loss-of-function experiments show Kremen1 biases cells toward supporting cell fate and suppresses hair cell formation via Wnt pathway modulation. |
Immunofluorescence/localization, gain-of-function overexpression, loss-of-function, zebrafish lateral line hair cell counting |
Scientific reports |
Medium |
27550540
|
| 2018 |
KREMEN1 is the entry receptor for Coxsackievirus A10 (CV-A10) and related group of EV-A enteroviruses; loss of KREMEN1 renders cells resistant to infection, and the extracellular domain of KREMEN1 binds CV-A10 directly and acts as a neutralizing agent; Kremen-deficient mice are resistant to CV-A10-induced lethal paralysis. |
Haploid genetic screen, KREMEN1 KO, overexpression, cell surface binding assay, soluble ectodomain neutralization, mouse infection model |
Cell host & microbe |
High |
29681460
|
| 2018 |
miR-431 silences Kremen1 expression by targeting its 3'UTR, preventing amyloid-beta-mediated synapse loss in cortico-hippocampal neuronal cultures from 3xTg-AD mice; Kremen1 knockdown similarly prevents DKK1-induced synapse loss, placing Kremen1 downstream in DKK1-mediated synaptic degeneration. |
miRNA transfection, 3'UTR luciferase reporter, immunofluorescence of synaptic puncta, neuronal culture |
Frontiers in cellular neuroscience |
Medium |
29643768
|
| 2019 |
Kremen1-induced apoptotic signaling requires homodimerization of the receptor; DKK1 binding inhibits Kremen1 multimerization and alleviates cell death; Kremen2, which has no intrinsic apoptotic activity, heterodimerizes with Kremen1 and inhibits Kremen1-induced cell death. |
Co-immunoprecipitation, forced dimerization constructs, apoptosis assays, Wnt reporter assays |
Cell death discovery |
High |
31069116
|
| 2020 |
Crystal structures of CV-A10 mature virus alone and in complex with KRM1 show that KRM1 spans the viral canyon with a large footprint on VP1; receptor binding induces release of a pocket factor and initiates conformational changes (expanded A-particles) primed for viral uncoating. |
Cryo-EM and X-ray crystallography of virus-receptor complex |
Nature communications |
High |
31911601
|
| 2020 |
Atomic structures of CV-A10 in complex with KRM1 under neutral and acidic conditions reveal KRM1 binds the mature viral particle above the canyon of VP1 across two adjacent asymmetric units; KRM1 binding induces pocket factor release (accelerated at acidic pH), and biochemical studies show receptor binding at acidic pH enables virion uncoating in vitro, identifying KRM1 as a two-in-one attachment and uncoating receptor. |
Cryo-EM structural determination, in vitro uncoating assay, biochemical binding studies under pH variation |
Proceedings of the National Academy of Sciences of the United States of America |
High |
32690697
|
| 2020 |
DKK3 signals through Kremen-1 and DVL-1 to reduce JNK/AP-1-mediated neuroinflammation after intracerebral hemorrhage; Kremen-1 siRNA knockdown abrogates DKK3's neuroprotective effects, placing Kremen-1 as a necessary downstream mediator of DKK3 anti-inflammatory signaling. |
siRNA in vivo knockdown, Western blot, immunofluorescence, neurobehavioral assays in mouse ICH model |
Journal of neuroinflammation |
Medium |
32331523
|
| 2014 |
In the zebrafish posterior lateral line primordium, Kremen1 restricts the spatial range of secreted DKK proteins; loss of Kremen1 results in increased spread of DKK1b protein and a decrease (not increase) in Wnt signaling, revealing a non-cell-autonomous mechanism whereby Kremen1 limits DKK diffusion to control Wnt activity. |
Zebrafish krm1 mutant, cell transplantation, DKK1b-mTangerine fusion protein visualization, Wnt reporter assays |
Development (Cambridge, England) |
High |
25038040
|
| 2021 |
KREMEN1 is a functional entry receptor for SARS-CoV-2; KREMEN1 alone is sufficient to mediate SARS-CoV-2 spike-dependent cell entry in vitro and in vivo; KREMEN1 was identified by screening 5054 human membrane proteins for interaction with the SARS-CoV-2 spike protein. |
Genome-wide receptome screen, cell infection assay, in vivo mouse model, neutralizing antibody blockade |
Cell research |
High |
34837059
|
| 2018 |
DKK4-CRD2 mediates high-affinity binding to both the E1E2 region of LRP6 and the Kremen1 extracellular domain; DKK4 and Krm family proteins function synergistically to inhibit Wnt signaling, and a diverse range of ternary complexes comprising Dkk, Krm, and LRP5/6 proteins can form. |
NMR structure determination, surface plasmon resonance, Wnt reporter assays |
The Journal of biological chemistry |
High |
29925589
|
| 2026 |
Kremen1 induces cell death with autophagic (rather than apoptotic) features; protein proximity (BioID) assays identified SEC24C (a COP-II complex component) as a critical effector; Kremen1 is in proximity with SEC24C and ATG9A after vesicular trafficking, and this fosters SEC24C proximity with ATG8, ERGIC, and ATG9A, increasing autophagosome numbers and driving cell death. Pharmacological autophagy inhibition or genetic silencing of SEC24C or ATG9A suppresses this cell death. |
BioID proximity labeling, pharmacological autophagy inhibition, siRNA knockdown of autophagy effectors, cell death assays |
Cell communication and signaling : CCS |
High |
41807954
|
| 2025 |
Disease-associated KREMEN1 variants (Cys111Ser, Gly166Asp, Phe209Ser, Phe258_Pro259del) show significantly reduced N- and O-glycosylation and impaired ternary complex formation with DKK1 and LRP6 compared to wild-type; patient fibroblasts exhibit higher basal WNT pathway activity followed by attenuated WNT3A response, demonstrating that these ectodermal dysplasia mutations broadly dysregulate WNT signaling. |
Ectopic expression in HEK293T cells, glycosylation analysis, co-immunoprecipitation for complex formation, TOPFlash WNT reporter in patient fibroblasts |
The Journal of investigative dermatology |
High |
40553753
|
| 2023 |
VP2 residue N142 of CVA10 is critical for binding to KREMEN1; mutation of N142 drastically reduces KREMEN1 receptor-binding activity, viral attachment, cell infection, and in vivo pathogenicity in mice. |
Neutralization-resistant mutant screening, soluble KREMEN1 binding assay, cell infection assay, mouse pathogenicity model |
PLoS pathogens |
High |
37788227
|
| 2025 |
VP2 residue K140 (K2140) is completely conserved among all KRM1-dependent enteroviruses (CVA2-CVA6, CVA10, CVA12) and is essential for receptor binding and infection; KRM1 residue D90 engages K2140 directly. CVA8 was experimentally demonstrated to use KRM1 as its receptor through this same interaction. |
Mutational analysis, binding assays, infection assays in vitro and in vivo, receptor identification for CVA8 |
mBio |
High |
39817751
|