Dickkopf

Last updated
Dickkopf-related protein 1
Identifiers
Symbol DKK1
NCBI gene 22943
HGNC 2891
OMIM 605189
RefSeq NP_036374
UniProt O94907
Other data
Locus Chr. 10 q21.1
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Structures Swiss-model
Domains InterPro
Dickkopf-related protein 2
Identifiers
Symbol DKK2
NCBI gene 27123
HGNC 2892
OMIM 605415
RefSeq NP_055236
UniProt Q9UBU2
Other data
Locus Chr. 4 q25
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Structures Swiss-model
Domains InterPro
Dickkopf-related protein 3
Identifiers
Symbol DKK3
NCBI gene 27122
HGNC 2893
OMIM 605416
RefSeq NP_037385
UniProt Q9QUN9
Other data
Locus Chr. 11 p15.3
Search for
Structures Swiss-model
Domains InterPro
Dickkopf-related protein 4
Identifiers
Symbol DKK4
NCBI gene 27121
HGNC 2894
OMIM 605417
RefSeq NP_055235
UniProt Q9UBT3
Other data
Locus Chr. 8 p11.21
Search for
Structures Swiss-model
Domains InterPro

Dickkopf (DKK) is a family of proteins consisting of five members as of 2020. That is, vertebrates usually contain five genes that are members of the family. The most well-studied is Dickkopf-related protein 1 (DKK1). [1] DKK proteins inhibit the Wnt signaling pathway coreceptors LRP5 and LRP6. They bind with high affinity as ligands to KREMEN1 and KREMEN2, which are transmembrane proteins. [2] DKK proteins have important roles in the development of vertebrates. [2]

Contents

Etymology

Dickkopf is a German word meaning "stubborn person", or literally, "thick head". It was coined as the name for these proteins in a 1998 Nature paper by Glinka et al. [3] in reference to the discovery that DKK1 induces head formation in the embryogenesis of Xenopus . [4]

Structure

DKK proteins are glycoproteins consisting of 255–350 amino acids. DKK1, DKK2, and DKK4 have similar molecular weights, at 24–29 kDa (kilodaltons). DKK3 is heaviest, at 38 kDa. [2] In addition to having similar weights, DKK1, -2, and -4 have high structural similarity, with two shared cysteine-rich domains. DKK3 differs from -1, -2, and -4 by the presence of a Soggy domain at its N-terminus. [5]

Proteins

Four DKK proteins and one DKK-like protein occur in humans and other vertebrates, [6] with five proteins in the family in total: [7]

Human disease

DKK proteins are believed to be involved with several human diseases, including bone cancer and neurodegenerative disease. Evidence also indicates DKK1 and DKK3 are involved in the pathophysiology of the artery, where they could contribute to atherosclerosis. [5]

Related Research Articles

<i>Xenopus</i> Genus of amphibians

Xenopus is a genus of highly aquatic frogs native to sub-Saharan Africa. Twenty species are currently described within it. The two best-known species of this genus are Xenopus laevis and Xenopus tropicalis, which are commonly studied as model organisms for developmental biology, cell biology, toxicology, neuroscience and for modelling human disease and birth defects.

The Wnt signaling pathways are a group of signal transduction pathways which begin with proteins that pass signals into a cell through cell surface receptors. The name Wnt is a portmanteau created from the names Wingless and Int-1. Wnt signaling pathways use either nearby cell-cell communication (paracrine) or same-cell communication (autocrine). They are highly evolutionarily conserved in animals, which means they are similar across animal species from fruit flies to humans.

<span class="mw-page-title-main">TCF7L2</span> Protein-coding gene in humans

Transcription factor 7-like 2 , also known as TCF7L2 or TCF4, is a protein acting as a transcription factor that, in humans, is encoded by the TCF7L2 gene. The TCF7L2 gene is located on chromosome 10q25.2–q25.3, contains 19 exons. As a member of the TCF family, TCF7L2 can form a bipartite transcription factor and influence several biological pathways, including the Wnt signalling pathway.

<span class="mw-page-title-main">Glycogen synthase kinase-3 beta</span> Protein-coding gene in the species Homo sapiens

Glycogen synthase kinase-3 beta, (GSK-3 beta), is an enzyme that in humans is encoded by the GSK3B gene. In mice, the enzyme is encoded by the Gsk3b gene. Abnormal regulation and expression of GSK-3 beta is associated with an increased susceptibility towards bipolar disorder.

<span class="mw-page-title-main">Frizzled-5</span> Protein-coding gene in the species Homo sapiens

Frizzled-5(Fz-5) is a protein that in humans is encoded by the FZD5 gene.

<span class="mw-page-title-main">Frizzled-8</span> Protein-coding gene in the species Homo sapiens

Frizzled-8(Fz-8) is a protein that in humans is encoded by the FZD8 gene.

<span class="mw-page-title-main">DKK1</span> Protein-coding gene in the species Homo sapiens

Dickkopf-related protein 1 is a protein that in humans is encoded by the DKK1 gene.

<span class="mw-page-title-main">LRP6</span> Protein-coding gene in the species Homo sapiens

Low-density lipoprotein receptor-related protein 6 is a protein that in humans is encoded by the LRP6 gene. LRP6 is a key component of the LRP5/LRP6/Frizzled co-receptor group that is involved in canonical Wnt pathway.

<span class="mw-page-title-main">WNT3A</span> Protein-coding gene in the species Homo sapiens

Protein Wnt-3a is a protein that in humans is encoded by the WNT3A gene.

<span class="mw-page-title-main">DKK3</span> Protein-coding gene in the species Homo sapiens

Dickkopf-related protein 3 is a protein in the Dickkopf family that in humans is encoded by the DKK3 gene.

<span class="mw-page-title-main">WNT7A</span> Protein-coding gene in the species Homo sapiens

Protein Wnt-7a is a protein that in humans is encoded by the WNT7A gene.

<span class="mw-page-title-main">WIF1</span> Protein-coding gene in the species Homo sapiens

Wnt inhibitory factor 1 is a protein that in humans is encoded by the WIF1 gene. WIF1 is a lipid-binding protein that binds to Wnt proteins and prevents them from triggering signalling.

<span class="mw-page-title-main">FAT1</span> Protein-coding gene in the species Homo sapiens

Protocadherin FAT1 is a protein that in humans is encoded by the FAT1 gene.

<span class="mw-page-title-main">WNT3</span> Protein and coding gene in humans

Proto-oncogene protein Wnt-3 is a protein that in humans is encoded by the WNT3 gene.

<span class="mw-page-title-main">DKK2</span> Protein-coding gene in the species Homo sapiens

Dickkopf-related protein 2 is a protein in the Dickkopf family that in humans is encoded by the DKK2 gene.

<span class="mw-page-title-main">WNT11</span> Protein-coding gene in the species Homo sapiens

Protein Wnt-11 is a protein that in humans is encoded by the WNT11 gene.

<span class="mw-page-title-main">WNT9A</span> Protein-coding gene in the species Homo sapiens

Protein Wnt-9a is a protein that in humans is encoded by the WNT9A gene.

<span class="mw-page-title-main">KREMEN1</span> Protein-coding gene in the species Homo sapiens

Kremen protein 1 is a protein that in humans is encoded by the KREMEN1 gene. Kremen1 is conserved in chordates including amphioxus and most vertebrate species. The protein is a type I transmembrane receptor of ligands Dickkopf1, Dickkopf2, Dickkopf3, Dickkopf4, EpCAM and Rspondin1.

<span class="mw-page-title-main">WNT2</span> Protein-coding gene in the species Homo sapiens

Wingless-type MMTV integration site family, member 2, also known as WNT2, is a human gene.

miR-203

In molecular biology miR-203 is a short non-coding RNA molecule. MicroRNAs function to regulate the expression levels of other genes by several mechanisms, such as translational repression and Argonaute-catalyzed messenger RNA cleavage. miR-203 has been identified as a skin-specific microRNA, and it forms an expression gradient that defines the boundary between proliferative epidermal basal progenitors and terminally differentiating suprabasal cells. It has also been found upregulated in psoriasis and differentially expressed in some types of cancer.

References

  1. Jackstadt R, Hodder MC, Sansom OJ (2020-03-09). "WNT and β-Catenin in Cancer: Genes and Therapy". Annual Review of Cancer Biology. 4 (1): 177–196. doi: 10.1146/annurev-cancerbio-030419-033628 . ISSN   2472-3428.
  2. 1 2 3 4 Niehrs C (December 2006). "Function and biological roles of the Dickkopf family of Wnt modulators". Oncogene. 25 (57): 7469–81. doi:10.1038/sj.onc.1210054. PMID   17143291. S2CID   27082767.
  3. Glinka A, et al. (22 January 1998). "Dickkopf-1 is a Member of a New Family of Secreted Proteins and Functions in Head Induction". Nature . 391 (6665): 357–362. Bibcode:1998Natur.391..357G. doi:10.1038/34848. ISSN   0028-0836. OCLC   918993798. PMID   9450748. S2CID   29306691.
  4. Kagey MH, He X (December 2017). "Rationale for Targeting the Wnt Signalling Modulator Dickkopf-1 for Oncology". British Journal of Pharmacology . 174 (24): 4637–4650. doi:10.1111/bph.13894. ISSN   0007-1188. OCLC   1167996437. PMC   5727329 . PMID   28574171.
  5. 1 2 Baetta R, Banfi C (July 2019). "Dkk (Dickkopf) Proteins". Arteriosclerosis, Thrombosis, and Vascular Biology. 39 (7): 1330–1342. doi: 10.1161/ATVBAHA.119.312612 . PMID   31092014.
  6. Patel S, Barkell AM, Gupta D, Strong SL, Bruton S, Muskett FW, et al. (August 2018). "Structural and functional analysis of Dickkopf 4 (Dkk4): New insights into Dkk evolution and regulation of Wnt signaling by Dkk and Kremen proteins". The Journal of Biological Chemistry. 293 (31): 12149–12166. doi: 10.1074/jbc.RA118.002918 . PMC   6078440 . PMID   29925589.
  7. Shao YC, Wei Y, Liu JF, Xu XY (2017). "The role of Dickkopf family in cancers: from Bench to Bedside". American Journal of Cancer Research. 7 (9): 1754–1768. PMC   5622213 . PMID   28979801.