Recombinant Human DNA replication factor Cdt1 (CDT1)

Code CSB-YP867131HU
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Source Yeast
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Code CSB-EP867131HU
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Source E.coli
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Code CSB-EP867131HU-B
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Source E.coli
Conjugate Avi-tag Biotinylated
E. coli biotin ligase (BirA) is highly specific in covalently attaching biotin to the 15 amino acid AviTag peptide. This recombinant protein was biotinylated in vivo by AviTag-BirA technology, which method is BriA catalyzes amide linkage between the biotin and the specific lysine of the AviTag.
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Code CSB-BP867131HU
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Source Baculovirus
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Code CSB-MP867131HU
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Source Mammalian cell
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Product Details

>85% (SDS-PAGE)
Target Names
Uniprot No.
Alternative Names
CDT 1; cdt1; CDT1_HUMAN; Chromatin licensing and DNA replication factor 1; DNA replication factor; DNA replication factor Cdt1; Double parked; Double parked Drosophila homolog of; Double parked homolog; DUP; Retroviral integration site 1; Retroviral integration site 2; Retroviral integration site1; Retroviral integration site2; RIS 2; RIS2
Homo sapiens (Human)
Expression Region
Target Protein Sequence
Protein Length
full length protein
Tag Info
The following tags are available.
N-terminal His-tagged
The tag type will be determined during production process. If you have specified tag type, please tell us and we will develop the specified tag preferentially.
Lyophilized powder
Note: We will preferentially ship the format that we have in stock, however, if you have any special requirement for the format, please remark your requirement when placing the order, we will prepare according to your demand.
Buffer before Lyophilization
Tris/PBS-based buffer, 6% Trehalose, pH 8.0
We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Please reconstitute protein in deionized sterile water to a concentration of 0.1-1.0 mg/mL.We recommend to add 5-50% of glycerol (final concentration) and aliquot for long-term storage at -20℃/-80℃. Our default final concentration of glycerol is 50%. Customers could use it as reference.
Troubleshooting and FAQs
Storage Condition
Store at -20°C/-80°C upon receipt, aliquoting is necessary for mutiple use. Avoid repeated freeze-thaw cycles.
Shelf Life
The shelf life is related to many factors, storage state, buffer ingredients, storage temperature and the stability of the protein itself.
Generally, the shelf life of liquid form is 6 months at -20°C/-80°C. The shelf life of lyophilized form is 12 months at -20°C/-80°C.
Lead Time
Delivery time may differ from different purchasing way or location, please kindly consult your local distributors for specific delivery time.
Note: All of our proteins are default shipped with normal blue ice packs, if you request to ship with dry ice, please communicate with us in advance and extra fees will be charged.
Repeated freezing and thawing is not recommended. Store working aliquots at 4°C for up to one week.
Please contact us to get it.

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Target Background

Required for both DNA replication and mitosis. DNA replication licensing factor, required for pre-replication complex assembly. Cooperates with CDC6 and the origin recognition complex (ORC) during G1 phase of the cell cycle to promote the loading of the mini-chromosome maintenance (MCM) complex onto DNA to generate pre-replication complexes (pre-RC)(PubMed:14672932). Required also for mitosis by promoting stable kinetochore-microtubule attachments. Potential oncogene.
Gene References into Functions
  1. Results show that both Cdc6 and Cdt1, when expressed in a high level, alone or in combination, were significantly associated with poorer survival in the breast cancer patient cohort. In line with this finding, the expression of Cdc6 and Cdt1 was upregulated in breast cancer cells compared to normal breast epithelial cells. Expression of Cdc6 and Cdt1 was significantly higher in ER negative breast cancer. PMID: 28428557
  2. CDT1, MCM7, and NUDT1 were shown to be up-regulated in hepatocellular carcinoma tissues and provide a more accurate diagnosis than alpha-fetal protein alone. PMID: 29442275
  3. PPP2R3B codes for the PR70 protein, a regulatory substrate-recognizing subunit of protein phosphatase 2A. PR70 decreased melanoma growth by negatively interfering with DNA replication and cell cycle progression through its role in stabilizing CDC6-chromatin licensing and CDT1 interaction PMID: 27974665
  4. mismatch repair (MMR) proteins are also involved in the degradation of Cdt1 after ultraviolet irradiation in the G1 phase PMID: 28278049
  5. Cdt1-binding protein GRWD1 promotes chromatin fluidity by influencing nucleosome structures, e.g., by transient eviction of H2A-H2B, and thereby promotes efficient MCM loading at replication origins. PMID: 27552915
  6. ATM silencing induced partial reduction in levels of Skp2, a component of SCF(Skp2) ubiquitin ligase that controls Cdt1 degradation. PMID: 24280901
  7. Protein levels of Geminin and Cdt1 are tightly regulated through the cell cycle, and the Cdt1-Geminin complex likely acts as a molecular switch that can enable or disable the firing of each origin of replication. PMID: 22918581
  8. These results demonstrate an important role for Cdt1 in human papillomavirus E7-induced rereplication and shed light on mechanisms by which human papillomavirus induces genomic instability. PMID: 23152514
  9. ATR, activated after DNA damage, phosphorylates Cdt2 and promotes the rapid degradation of Cdt1 after UV irradiation in the G1 phase of the cell cycle. PMID: 23029527
  10. A lethal phenotype was seen in four individuals with compound heterozygous CDT1 mutations PMID: 22333897
  11. results support the conclusion that Cdt1 binding to Hec1 is essential for an extended Ndc80 configuration and stable kinetochore-microtubule attachment PMID: 22581055
  12. Genes in the erythroid differentiation and cell cycle regulation pathways influence interindividual variation in RBC indices. Our results provide insights into the molecular basis underlying variation in RBC traits. PMID: 22560525
  13. FOXO3 is a binding partner of Cdt1. PMID: 22451935
  14. The over-expression of geminin and cdt1 may play an important role in pathogenesis of acute leukemia. PMID: 21729526
  15. Cdt1- and SNF2H-mediated promotion of MCM loading may be biologically relevant for the regulation of DNA replication. PMID: 21937426
  16. JNK1 phosphorylation of Cdt1 inhibits recruitment of HBO1 histone acetylase and blocks replication licensing in response to stress PMID: 21856198
  17. findings support a model in which MAP kinase activity in G(2) promotes reaccumulation of a low-activity Cdt1 isoform after replication is complete. PMID: 21930785
  18. p97 is an essential regulator of DNA damage-dependent CDT1 destruction PMID: 21981919
  19. Studies suggest that DNA damage-induced ubiquitination or sumoylation of PCNA prevents CRL4Cdt2-dependent degradation by inhibiting binding of Cdt1 to PCNA. PMID: 21846465
  20. study reports that UBCH8 and UBE2G1 and UBE2G2 cooperate with CRL4Cdt2 in promoting the polyubiquitylation and subsequent degradation of p21 and Cdt1, respectively PMID: 21628527
  21. Cdt1 is recruited onto damaged sites in G1 phase cells, within seconds of DNA damage induction by ultraviolet laser PMID: 21224399
  22. Results indicate that the interaction between hCdt1 and hMcm6 through their interacting domains is key for hCdt1 in facilitating the MCM hetero-hexamer to load onto chromatin for replication licensing. PMID: 21099365
  23. in human cancer cells, RBX1 silencing causes the accumulation of DNA replication licensing proteins CDT1 and ORC1, leading to DNA double-strand breaks, DDR, G(2) arrest, and, eventually, aneuploidy PMID: 21115485
  24. Cdt1 degradation following UV irradiation occurs rapidly at damaged sites due to PCNA chromatin loading and the recruitment of Cdt1 and CRL4(Cdt2), before DNA damage repair is completed PMID: 20929861
  25. Cdt1 promote MCM loading in vivo involves the stimulation of large-scale chromatin decondensation to allow access to the underlying DNA substrate. PMID: 20980834
  26. Data show that the Cdt1:Geminin complex can exist in two distinct forms, a "permissive" heterotrimer and an "inhibitory" heterohexamer. PMID: 19906994
  27. human CDT1 is essential for DNA replication and chromatin licensing PMID: 11896191
  28. Results show that geminin, cdt1 and cdc6 are differentially regulated during megakaryocytic differentiation and suggest an active role of cdc6 in endomitosis. PMID: 12429841
  29. SCF(Skp2)-mediated ubiquitination pathway may play an important role in the cell cycle-dependent Cdt1 degradation in mammalian cells. PMID: 12840033
  30. Cdt1 function is negatively regulated by the Cdk phosphorylation independent of geminin binding PMID: 14993212
  31. Cdt1 is phosphorylated and its degradation induced by Cdk2 and Cdk4 PMID: 15004027
  32. Geminin is both a negative and positive regulator of pre-replicative complex formation in human cells, playing a positive role in allowing CDT1 accumulation in G2-M PMID: 15257290
  33. in proliferating HeLa cells geminin and Cdt1 are co-expressed during a relatively short time at the G(1)-to-S phase transition; Cdt1 is rapidly degraded early in S phase, but geminin remains bound to the chromatin sites PMID: 15284237
  34. a Skp2-independent pathway that requires the N-terminal 32 residues of Cdt1 is critical for the degradation of Cdt1 in S phase- this degradation is necessary for the optimum progression of cells through S phase PMID: 15855168
  35. Cdt1 overexpression contributes to tumorigenecity by causing genomic instability in transgenic p53 knockout mice. PMID: 16261166
  36. Cdt1 expression is severely downregulated upon differentiation of Caco-2 cells, an in vitro model of intestinal epithelial differentiation. PMID: 16273206
  37. PCNA is involved in mediating Cdt1 degradation by the Cul4-Ddb1 ligase in response to DNA damage. PMID: 16407242
  38. Data from several different systems strongly indicate that unregulated Cdt1 overexpression at pathophysiological levels can induce chromosomal damage other than rereplication in non-transformed cells. PMID: 16835273
  39. L2DTL and PCNA interact with CUL4/DDB1 complexes and are involved in CDT1 degradation after DNA damage. PMID: 16861906
  40. Results suggest that DDB1 prevents DNA lesions from accumulating in replicating human cells, in part by regulating Cdt1 degradation. PMID: 16940174
  41. These studies uncover diverse substrate receptors for Cul4 and identify Cdt2 as a conserved component of the Cul4-Ddb1 E3 that is essential to destroy Cdt1 and ensure proper cell cycle regulation of DNA replication. PMID: 16949367
  42. Findings suggest that the CDT1 838G/A and GMNN 387C/A polymorphisms may not play a major role in the etiology of breast cancer, but CDT1 variant may have a potential role only in genetically susceptible women. PMID: 17029205
  43. DTL promotes genomic stability through two distinct mechanisms. First, it is an essential component of the CUL4-DDB1 complex that controls CDT1 levels, thereby preventing rereplication. Second, it is required for the early G2/M checkpoint. PMID: 17085480
  44. we discuss how these dynamic Cdt1-chromatin interactions and the local recruitment of Geminin onto origins of replication by Cdt1 may provide a tight control of the licensing process in time and in space. PMID: 17598984
  45. hCdt1 and hCdc6 expression promote malignant behavior PMID: 18006835
  46. Human Cdt1-binding proteins were identified by a combination of Cdt1 affinity chromatography and liquid chromatography and tandem mass spectrometry analysis. PMID: 18162579
  47. exogenous Cdt1 induces re-replication by de-repressing endogenous Cdt1 through the titration of PCNA and cyclin; Cdt1 lacking the evolutionarily conserved region that interacts with MCM2-7 is capable of inducing re-replication PMID: 18184650
  48. These results suggested that, at least in vitro, oleic acid-containing cell membranes of the lipid bilayer inhibit Cdt1-geminin complex formation by binding to Cdt1 and thereby liberating Cdt1 from inhibition by geminin. PMID: 18288374
  49. Cdt1 and Geminin expression is deregulated in human tumor specimens and may represent novel markers useful for cancer diagnosis and prognosis. PMID: 18508524
  50. rereplication-associated DNA damage triggers Cdt1 and Cdc6 ubiquitination and destruction; this pathway represents an evolutionarily conserved mechanism that minimizes the extent of rereplication PMID: 18617514

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Involvement in disease
Meier-Gorlin syndrome 4 (MGORS4)
Subcellular Location
Nucleus. Chromosome, centromere, kinetochore.
Protein Families
Cdt1 family
Database Links

HGNC: 24576

OMIM: 605525

KEGG: hsa:81620

STRING: 9606.ENSP00000301019

UniGene: Hs.122908

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