ERCC4

Last updated
ERCC4
Protein ERCC4 PDB 1z00.png
Available structures
PDB Ortholog search: PDBe RCSB
Identifiers
Aliases ERCC4 , ERCC11, FANCQ, RAD1, XPF, XFEPS, excision repair cross-complementation group 4, ERCC excision repair 4, endonuclease catalytic subunit
External IDs OMIM: 133520 MGI: 1354163 HomoloGene: 3836 GeneCards: ERCC4
Orthologs
SpeciesHumanMouse
Entrez

2072

50505

Ensembl

ENSG00000175595

ENSMUSG00000022545

UniProt

Q92889

Q9QZD4

RefSeq (mRNA)

NM_005236

NM_015769

RefSeq (protein)

NP_005227

NP_056584

Location (UCSC) Chr 16: 13.92 – 13.95 Mb Chr 16: 12.93 – 12.97 Mb
PubMed search [3] [4]
Wikidata
View/Edit Human View/Edit Mouse

ERCC4 is a protein designated as DNA repair endonuclease XPF that in humans is encoded by the ERCC4 gene. Together with ERCC1, ERCC4 forms the ERCC1-XPF enzyme complex that participates in DNA repair and DNA recombination. [5] [6]

Contents

The nuclease enzyme ERCC1-XPF cuts specific structures of DNA. Many aspects of these two gene products are described together here because they are partners during DNA repair. The ERCC1-XPF nuclease is an essential activity in the pathway of DNA nucleotide excision repair (NER). The ERCC1-XPF nuclease also functions in pathways to repair double-strand breaks in DNA, and in the repair of "crosslink" damage that harmfully links the two DNA strands.

Cells with disabling mutations in ERCC4 are more sensitive than normal to particular DNA damaging agents, including ultraviolet radiation and to chemicals that cause crosslinking between DNA strands. Genetically engineered mice with disabling mutations in ERCC4 also have defects in DNA repair, accompanied by metabolic stress-induced changes in physiology that result in premature aging. [7] Complete deletion of ERCC4 is incompatible with viability of mice, and no human individuals have been found with complete (homozygous) deletion of ERCC4. Rare individuals in the human population harbor inherited mutations that impair the function of ERCC4. When the normal genes are absent, these mutations can lead to human syndromes, including xeroderma pigmentosum, Cockayne syndrome and Fanconi anemia.

ERCC1 and ERCC4 are the human gene names and Ercc1 and Ercc4 are the analogous mammalian gene names. Similar genes with similar functions are found in all eukaryotic organisms.

Gene

The human ERCC4 gene can correct the DNA repair defect in specific ultraviolet light (UV)-sensitive mutant cell lines derived from Chinese hamster ovary cells. [8] Multiple independent complementation groups of Chinese hamster ovary (CHO) cells have been isolated, [9] and this gene restored UV resistance to cells of complementation group 4. Reflecting this cross-species genetic complementation method, the gene was called "Excision repair cross-complementing 4" [10]

The human ERCC4 gene encodes the XPF protein of 916 amino acids with a molecular mass of about 104,000 daltons.

Genes similar to ERCC4 with equivalent functions (orthologs) are found in other eukaryotic genomes. Some of the most studied gene orthologs include RAD1 in the budding yeast Saccharomyces cerevisiae, and rad16+ in the fission yeast Schizosaccharomyces pombe.

Protein

Figure 1: Diagram of XPF showing an inactive helicase domain, a nuclease domain and a helix-hairpin-helix domain Fig 1 XPF Wikigene.png
Figure 1: Diagram of XPF showing an inactive helicase domain, a nuclease domain and a helix-hairpin-helix domain

One ERCC1 molecule and one XPF molecule bind together, forming an ERCC1-XPF heterodimer which is the active nuclease form of the enzyme. In the ERCC1–XPF heterodimer, ERCC1 mediates DNA– and protein–protein interactions. XPF provides the endonuclease active site and is involved in DNA binding and additional protein–protein interactions. [8]

The ERCC4/XPF protein consists of two conserved areas separated by a less conserved region in the middle. The N-terminal area has homology to several conserved domains of DNA helicases belonging to superfamily II, although XPF is not a DNA helicase. [11] The C-terminal region of XPF includes the active site residues for nuclease activity. [12] (Figure 1).

Most of the ERCC1 protein is related at the sequence level to the C terminus of the XPF protein., [13] but residues in the nuclease domain are not present. A DNA binding "helix-hairpin-helix" domain at the C-terminus of each protein.

By primary sequence and protein structural similarity, the ERCC1-XPF nuclease is a member of a broader family of structure specific DNA nucleases comprising two subunits. Such nucleases include, for example, the MUS81-EME1 nuclease.

Structure-specific nuclease

Figure 2: DNA substrates of ERCC1-XPF nuclease Fig 2 XPF Substrate Wikigene.png
Figure 2: DNA substrates of ERCC1-XPF nuclease

The ERCC1–XPF complex is a structure-specific endonuclease. ERCC1-XPF does not cut DNA that is exclusively single-stranded or double-stranded, but it cleaves the DNA phosphodiester backbone specifically at junctions between double-stranded and single-stranded DNA. It introduces a cut in double-stranded DNA on the 5′ side of such a junction, about two nucleotides away [14] (Figure 2). This structure-specificity was initially demonstrated for RAD10-RAD1, the yeast orthologs of ERCC1 and XPF. [15]

The hydrophobic helix–hairpin–helix motifs in the C-terminal regions of ERCC1 and XPF interact to promote dimerization of the two proteins. [16] [17] There is no catalytic activity in the absence of dimerization. Indeed, although the catalytic domain is within XPF and ERCC1 is catalytically inactive, ERCC1 is indispensable for activity of the complex.

Several models have been proposed for binding of ERCC1–XPF to DNA, based on partial structures of relevant protein fragments at atomic resolution. [16] DNA binding mediated by the helix-hairpin-helix domains of ERCC1 and XPF domains positions the heterodimer at the junction between double-stranded and single-stranded DNA.

Nucleotide excision repair (NER)

During nucleotide excision repair, several protein complexes cooperate to recognize damaged DNA and locally separate the DNA helix for a short distance on either side of the site of a site of DNA damage. The ERCC1–XPF nuclease incises the damaged DNA strand on the 5′ side of the lesion. [14] During NER, the ERCC1 protein interacts with the XPA protein to coordinate DNA and protein binding.

DNA double-strand break (DSB) repair

Mammalian cells with mutant ERCC1–XPF are moderately more sensitive than normal cells to agents (such as ionizing radiation) that cause double-stranded breaks in DNA. [18] [19] Particular pathways of both homologous recombination repair and non-homologous end-joining rely on ERCC1-XPF function. [20] [21] The relevant activity of ERCC1–XPF for both types of double-strand break repair is the ability to remove non-homologous 3′ single-stranded tails from DNA ends before rejoining. This activity is needed during a single-strand annealing subpathway of homologous recombination. Trimming of 3’ single-stranded tails is also needed in a mechanistically distinct subpathway of non-homologous end-joining, independent of the Ku proteins [22] [19] Homologous integration of DNA, an important technique for genetic manipulation, is dependent on the function of ERCC1-XPF in the host cell. [23]

Mammalian cells carrying mutations in ERCC1 or XPF are especially sensitive to agents that cause DNA interstrand crosslinks (ICL) [24] Interstrand crosslinks block the progression of DNA replication, and structures at blocked DNA replication forks provide substrates for cleavage by ERCC1-XPF. [20] [25] Incisions may be made on either side of the crosslink on one DNA strand to unhook the crosslink and initiate repair. Alternatively, a double-strand break may be made in the DNA near the ICL, and subsequent homologous recombination repair my involve ERCC1-XPF action. Although not the only nuclease involved, ERCC1–XPF is required for ICL repair during several phases of the cell cycle. [26] [27]

Clinical significance

Xeroderma pigmentosum (XP)

Some individuals with the rare inherited syndrome xeroderma pigmentosum have mutations in ERCC4. These patients are classified as XP complementation group F (XP-F). Diagnostic features of XP are dry scaly skin, abnormal skin pigmentation in sun-exposed areas and severe photosensitivity, accompanied by a great than 1000-fold increased risk of developing UV radiation-induced skin cancers. [5]

Cockayne syndrome (CS)

Most XP-F patients show moderate symptoms of XP, but a few show additional symptoms of Cockayne syndrome. [28] Cockayne syndrome (CS) patients exhibit photosensitivity, and also exhibit developmental defects and neurological symptoms. [5] [7]

Mutations in the ERCC4 gene can result in the very rare XF-E syndrome. [29] These patients have characteristics of XP and CS, as well as additional neurologic, hepatobiliary, musculoskeletal and hematopoietic symptoms.

Fanconi anemia

Several human patients with symptoms of Fanconi anemia (FA) have causative mutations in the ERCC4 gene. Fanconi anemia is a complex disease, involving major hematopoietic symptoms. A characteristic feature of FA is the hypersensitivity to agents that cause interstrand DNA crosslinks. FA patients with ERCC4 mutations have been classified as belonging to Fanconi anemia complementation group Q (FANCQ). [28] [30]

ERCC4 (XPF) in the normal colon

Sequential sections of the same colon crypt with immunohistochemical staining (brown) showing normal high expression of DNA repair proteins PMS2 (A), ERCC1 (B) and ERCC4 (XPF) (C). This crypt is from the biopsy of a 58-year-old male patient who never had colonic neoplasia and the crypt has high expression of these DNA repair proteins in absorptive cell nuclei throughout most of the crypt. Note that PMS2 and ERCC4 (XPF) expression (in panels A and C) are each reduced or absent in the nuclei of cells at the top of the crypt and within the surface of the colonic lumen between crypts. Original image, also in a publication. Sequential sections of a colon crypt showing normal high expression of PMS2 (A), ERCC1 (B) and ERCC4 (C).tiff
Sequential sections of the same colon crypt with immunohistochemical staining (brown) showing normal high expression of DNA repair proteins PMS2 (A), ERCC1 (B) and ERCC4 (XPF) (C). This crypt is from the biopsy of a 58-year-old male patient who never had colonic neoplasia and the crypt has high expression of these DNA repair proteins in absorptive cell nuclei throughout most of the crypt. Note that PMS2 and ERCC4 (XPF) expression (in panels A and C) are each reduced or absent in the nuclei of cells at the top of the crypt and within the surface of the colonic lumen between crypts. Original image, also in a publication.

ERCC4 (XPF) is normally expressed at a high level in cell nuclei within the inner surface of the colon (see image, panel C). The inner surface of the colon is lined with simple columnar epithelium with invaginations. The invaginations are called intestinal glands or colon crypts. The colon crypts are shaped like microscopic thick walled test tubes with a central hole down the length of the tube (the crypt lumen). Crypts are about 75 to 110 cells long. DNA repair, involving high expression of ERCC4 (XPF), PMS2 and ERCC1 proteins, appears to be very active in colon crypts in normal, non-neoplastic colon epithelium.

Cells are produced at the crypt base and migrate upward along the crypt axis before being shed into the colonic lumen days later. [32] There are 5 to 6 stem cells at the bases of the crypts. [32] There are about 10 million crypts along the inner surface of the average human colon. [31] If the stem cells at the base of the crypt express ERCC4 (XPF), generally all several thousand cells of the crypt will also express ERCC4 (XPF). This is indicated by the brown color seen by immunostaining of ERCC4 (XPF) in almost all the cells in the crypt in panel C of the image in this section. A similar expression of PMS2 and ERCC1 occurs in the thousands of cells in each normal colonic crypt.

The tissue section in the image shown here was also counterstained with hematoxylin to stain DNA in nuclei a blue-gray color. Nuclei of cells in the lamina propria, cells which are below and surround the epithelial crypts, largely show hematoxylin blue-gray color and have little expression of PMS2, ERCC1 or ERCC4 (XPF). In addition, cells at the very tops of the crypts stained for PMS2 (panel A) or ERCC4 (XPF) (panel C) have low levels of these DNA repair proteins, so that such cells show the blue-gray DNA stain as well. [31]

ERCC4 (XPF) deficiency in the colon epithelium adjacent to and within cancers

Sequential sections of a segment of colon epithelium near a colorectal cancer showing reduced or absent expression of PMS2 (A), ERCC1 (B) and ERCC4 (C) in the colon crypts. This tissue segment is from a histologically normal area of a colon resection of a male patient who had an adenocarcinoma in the sigmoid colon. For PMS2 (A), there is absent expression in cell nuclei of the crypt body, the crypt neck and the colonic lumen surface for all epithelial cells. For ERCC1 (B), there is reduced expression in most of the cell nuclei of the crypts, but there is high expression in cell nuclei at the neck of the crypts and in the adjacent colonic lumen surface. For ERCC4 (XPF) (C), there is absent expression in most of the cell nuclei of the crypts and in the colonic lumen in this area of tissue, but detectable expression at the neck of some crypts. The reductions or absence of expression of these DNA repair genes in this tissue appears to be due to epigenetic repression. Original image, also in a publication. Sequential sections of colon epithelium near a cancer showing reduced or absent expression of PMS2 (A), ERCC1 (B) and ERCC4 (C).tif
Sequential sections of a segment of colon epithelium near a colorectal cancer showing reduced or absent expression of PMS2 (A), ERCC1 (B) and ERCC4 (C) in the colon crypts. This tissue segment is from a histologically normal area of a colon resection of a male patient who had an adenocarcinoma in the sigmoid colon. For PMS2 (A), there is absent expression in cell nuclei of the crypt body, the crypt neck and the colonic lumen surface for all epithelial cells. For ERCC1 (B), there is reduced expression in most of the cell nuclei of the crypts, but there is high expression in cell nuclei at the neck of the crypts and in the adjacent colonic lumen surface. For ERCC4 (XPF) (C), there is absent expression in most of the cell nuclei of the crypts and in the colonic lumen in this area of tissue, but detectable expression at the neck of some crypts. The reductions or absence of expression of these DNA repair genes in this tissue appears to be due to epigenetic repression. Original image, also in a publication.

ERCC4 (XPF) is deficient in about 55% of colon cancers, and in about 40% of the colon crypts in the epithelium within 10 cm adjacent to the cancers (in the field defects from which the cancers likely arose). [31] When ERCC4 (XPF) is reduced in colonic crypts in a field defect, it is most often associated with reduced expression of DNA repair enzymes ERCC1 and PMS2 as well, as illustrated in the image in this section. Deficiencies in ERCC1 (XPF) in colon epithelium appear to be due to epigenetic repression. [31] A deficiency of ERCC4 (XPF) would lead to reduced repair of DNA damages. As indicated by Harper and Elledge, [33] defects in the ability to properly respond to and repair DNA damage underlie many forms of cancer. The frequent epigenetic reduction in ERCC4 (XPF) in field defects surrounding colon cancers as well as in cancers (along with epigenetic reductions in ERCC1 and PMS2) indicate that such reductions may often play a central role in progression to colon cancer.

Although epigenetic reductions in ERCC4 (XPF) expression are frequent in human colon cancers, mutations in ERCC4 (XPF) are rare in humans. [34] However, a mutation in ERCC4 (XPF) causes patients to be prone to skin cancer. [34] An inherited polymorphism in ERCC4 (XPF) appears to be important in breast cancer as well. [35] These infrequent mutational alterations underscore the likely role of ERCC4 (XPF) deficiency in progression to cancer.

Notes

Related Research Articles

<span class="mw-page-title-main">DNA repair</span> Cellular mechanism

DNA repair is a collection of processes by which a cell identifies and corrects damage to the DNA molecules that encodes its genome. In human cells, both normal metabolic activities and environmental factors such as radiation can cause DNA damage, resulting in tens of thousands of individual molecular lesions per cell per day. Many of these lesions cause structural damage to the DNA molecule and can alter or eliminate the cell's ability to transcribe the gene that the affected DNA encodes. Other lesions induce potentially harmful mutations in the cell's genome, which affect the survival of its daughter cells after it undergoes mitosis. As a consequence, the DNA repair process is constantly active as it responds to damage in the DNA structure. When normal repair processes fail, and when cellular apoptosis does not occur, irreparable DNA damage may occur, including double-strand breaks and DNA crosslinkages. This can eventually lead to malignant tumors, or cancer as per the two-hit hypothesis.

<span class="mw-page-title-main">Xeroderma pigmentosum</span> Medical condition

Xeroderma pigmentosum (XP) is a genetic disorder in which there is a decreased ability to repair DNA damage such as that caused by ultraviolet (UV) light. Symptoms may include a severe sunburn after only a few minutes in the sun, freckling in sun-exposed areas, dry skin and changes in skin pigmentation. Nervous system problems, such as hearing loss, poor coordination, loss of intellectual function and seizures, may also occur. Complications include a high risk of skin cancer, with about half having skin cancer by age 10 without preventative efforts, and cataracts. There may be a higher risk of other cancers such as brain cancers.

<span class="mw-page-title-main">Neoplasm</span> Tumor or other abnormal growth of tissue

A neoplasm is a type of abnormal and excessive growth of tissue. The process that occurs to form or produce a neoplasm is called neoplasia. The growth of a neoplasm is uncoordinated with that of the normal surrounding tissue, and persists in growing abnormally, even if the original trigger is removed. This abnormal growth usually forms a mass, which may be called a tumour or tumor.

<span class="mw-page-title-main">Nucleotide excision repair</span> DNA repair mechanism

Nucleotide excision repair is a DNA repair mechanism. DNA damage occurs constantly because of chemicals, radiation and other mutagens. Three excision repair pathways exist to repair single stranded DNA damage: Nucleotide excision repair (NER), base excision repair (BER), and DNA mismatch repair (MMR). While the BER pathway can recognize specific non-bulky lesions in DNA, it can correct only damaged bases that are removed by specific glycosylases. Similarly, the MMR pathway only targets mismatched Watson-Crick base pairs.

<span class="mw-page-title-main">Base excision repair</span> DNA repair process

Base excision repair (BER) is a cellular mechanism, studied in the fields of biochemistry and genetics, that repairs damaged DNA throughout the cell cycle. It is responsible primarily for removing small, non-helix-distorting base lesions from the genome. The related nucleotide excision repair pathway repairs bulky helix-distorting lesions. BER is important for removing damaged bases that could otherwise cause mutations by mispairing or lead to breaks in DNA during replication. BER is initiated by DNA glycosylases, which recognize and remove specific damaged or inappropriate bases, forming AP sites. These are then cleaved by an AP endonuclease. The resulting single-strand break can then be processed by either short-patch or long-patch BER.

A DNA repair-deficiency disorder is a medical condition due to reduced functionality of DNA repair.

<span class="mw-page-title-main">Crosslinking of DNA</span> Phenomenon in genetics

In genetics, crosslinking of DNA occurs when various exogenous or endogenous agents react with two nucleotides of DNA, forming a covalent linkage between them. This crosslink can occur within the same strand (intrastrand) or between opposite strands of double-stranded DNA (interstrand). These adducts interfere with cellular metabolism, such as DNA replication and transcription, triggering cell death. These crosslinks can, however, be repaired through excision or recombination pathways.

<span class="mw-page-title-main">MLH1</span> Protein-coding gene in the species Homo sapiens

DNA mismatch repair protein Mlh1 or MutL protein homolog 1 is a protein that in humans is encoded by the MLH1 gene located on chromosome 3. The gene is commonly associated with hereditary nonpolyposis colorectal cancer. Orthologs of human MLH1 have also been studied in other organisms including mouse and the budding yeast Saccharomyces cerevisiae.

<span class="mw-page-title-main">PMS2</span> Protein-coding gene in the species Homo sapiens

Mismatch repair endonuclease PMS2 is an enzyme that in humans is encoded by the PMS2 gene.

<span class="mw-page-title-main">ERCC1</span> Protein-coding gene in the species Homo sapiens

DNA excision repair protein ERCC-1 is a protein that in humans is encoded by the ERCC1 gene. Together with ERCC4, ERCC1 forms the ERCC1-XPF enzyme complex that participates in DNA repair and DNA recombination.

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

DNA repair protein complementing XP-A cells is a protein that in humans is encoded by the XPA gene.

<span class="mw-page-title-main">ERCC6</span> Gene of the species Homo sapiens

DNA excision repair protein ERCC-6 is a protein that in humans is encoded by the ERCC6 gene. The ERCC6 gene is located on the long arm of chromosome 10 at position 11.23.

<span class="mw-page-title-main">ERCC5</span> Protein-coding gene in the species Homo sapiens

DNA repair protein complementing XP-G cells is a protein that in humans is encoded by the ERCC5 gene.

<span class="mw-page-title-main">DCLRE1A</span> Protein-coding gene in the species Homo sapiens

DNA cross-link repair 1A protein is a protein that in humans is encoded by the DCLRE1A gene.

The DNA damage theory of aging proposes that aging is a consequence of unrepaired accumulation of naturally occurring DNA damage. Damage in this context is a DNA alteration that has an abnormal structure. Although both mitochondrial and nuclear DNA damage can contribute to aging, nuclear DNA is the main subject of this analysis. Nuclear DNA damage can contribute to aging either indirectly or directly.

<span class="mw-page-title-main">SLX4</span> Protein involved in DNA repair

SLX4 is a protein involved in DNA repair, where it has important roles in the final steps of homologous recombination. Mutations in the gene are associated with the disease Fanconi anemia.

<span class="mw-page-title-main">FAN1</span> Protein-coding gene in the species Homo sapiens

FANCD2/FANCI-associated nuclease 1 (KIAA1018) is an enzyme that in humans is encoded by the FAN1 gene. It is a structure dependent endonuclease. It is thought to play an important role in the Fanconi Anemia (FA) pathway.

<span class="mw-page-title-main">SLX4IP</span> Protein-coding gene in the species Homo sapiens

SLX4 interacting protein is a protein that in humans is encoded by the SLX4IP gene.

<span class="mw-page-title-main">Orlando D. Schärer</span> Swiss chemist and biologist

Orlando David Schärer is a Swiss chemist and biologist researching DNA repair, genomic integrity, and cancer biology. Schärer has taught biology, chemistry and pharmacology at various university levels on three continents. He is a distinguished professor at the Ulsan National Institute of Science and Technology (UNIST) and an associate director of the IBS Center for Genomic Integrity located in Ulsan, South Korea. He leads the three interdisciplinary research teams in the Chemical & Cancer Biology Branch of the center and specifically heads the Cancer Therapeutics Mechanisms Section.

Laura J. Niedernhofer is an American professor of biochemistry, molecular biology, and biophysics, with expertise in the fields of DNA damage, repair, progeroid syndromes and cellular senescence

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