CENPJ (centromere protein J), also known as CPAP, LAP, or LIP1, belongs to the TCP10 protein family. It plays a pivotal role in centrosome function, ensuring proper centriole duplication and mitotic spindle assembly. The antibody targeting CENPJ is typically raised against recombinant human protein fragments (e.g., AA 1082-1248) and is conjugated with biotin for enhanced sensitivity in assays requiring streptavidin-mediated detection.
Key Features of CENPJ Antibody, Biotin Conjugated
Characteristic
Details
Target Protein
CENPJ (153 kDa, 1338 amino acids)
Host/Isotype
Rabbit IgG
Conjugation
Biotin (for ELISA, Western blot, or immunoprecipitation)
Reactivity
Human, mouse, rat (validated in multiple species)
Immunogen
Recombinant human CENPJ fragments (e.g., AA 1082-1248)
Purification
Antigen affinity purification or Protein G chromatography
Storage
PBS with 0.02% sodium azide and 50% glycerol (store at -20°C)
Applications in Research
The antibody is optimized for several techniques, with biotin conjugation enhancing its utility in assays requiring high sensitivity:
Application
Description
ELISA
Quantitative detection of CENPJ in lysates or serum
Western Blot
Detection of CENPJ in cell lysates (suggested dilution: 1:500-1:1000)
Immunoprecipitation
Isolation of CENPJ complexes for downstream analysis
Immunofluorescence
Localization of CENPJ in centrosomes (dilution: 1:200-1:800)
Research Relevance
CENPJ antibodies are critical in studying centrosome biology and microcephaly-related pathways. For example:
A study using Proteintech’s 11517-1-AP antibody demonstrated CENPJ’s role in preventing microtubule overnucleation during mitosis.
Biotin-conjugated variants (e.g., ABIN7147363) enable high-throughput ELISA screens for CENPJ expression in disease models.
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Synonyms
BM032 antibody; CENP-J antibody; CENPJ antibody; CENPJ_HUMAN antibody; Centromere protein J antibody; Centrosomal P4.1-associated protein antibody; CPAP antibody; LAG-3-associated protein antibody; LAP antibody; LIP1 antibody; LYST interacting protein LIP1 antibody; LYST interacting protein LIP7 antibody; LYST-interacting protein 1 antibody; MCPH6 antibody; Sas 4 antibody; SASS4 antibody; SCKL4 antibody
CENPJ antibody plays a crucial role in cell division and centrosome function by actively participating in centriole duplication. It effectively inhibits microtubule nucleation from the centrosome. This antibody is involved in regulating the slow, processive growth of centriolar microtubules. It acts as a microtubule plus-end tracking protein that stabilizes centriolar microtubules while inhibiting microtubule polymerization and extension from the distal ends of centrioles. CENPJ antibody is essential for centriole elongation and STIL-mediated centriole amplification. It's required for the recruitment of CEP295 to the proximal end of newly formed centrioles at the centriolar microtubule wall during early S phase, in a PLK4-dependent manner. This antibody might be involved in controlling centriolar-microtubule growth by acting as a regulator of tubulin release.
Gene References Into Functions
CPAP (CENPJ) regulates the delivery of its bound beta-tubulin to define the size of microtubule-based cellular structures using a "clutch-like" mechanism. PMID: 27306797
Research suggests that alcohol/ethanol exposure diminishes the pool of proliferative neurons (Neuro2a cell line) through the disruption of spindle orientation and the promotion of asymmetric cell division. These neuronal abnormalities seem to be caused by a reduced CENPJ protein expression level. PMID: 29778912
CPAP-S467D protein exhibits a low affinity for microtubule binding but a high affinity for pericentriolar material proteins. PMID: 26997271
CPAP promotes timely cilium disassembly to maintain the neural progenitor pool. Mutations in CPAP cause Seckel syndrome with microcephaly. PMID: 26929011
Data indicates that the single G-box domain (which appears to fold into 14-20 antiparallel beta-strands) of CENPJ has a stable yet dynamic structure. CRAP forms multimers (in solution and in crystals) of elongated fibrils similar to amyloid fibrils. [REVIEW] PMID: 26517891
Centrobin plays a significant role in the stability and centriole elongation function of CPAP and limits the centriole length. PMID: 25616662
Studies provide the first structural insights into how the malfunction of centriole proteins leads to human disease and also reveal that the CPAP-STIL interaction represents a conserved key step in centriole biogenesis. PMID: 24052813
The results demonstrated a human-specific hypomethylation in the 5' UTR of CENPJ in the brain, where methylation levels among humans are approximately one-third of those found in nonhuman primates. PMID: 24288161
The Centrobin-CPAP interaction is crucial for the recruitment of CPAP to procentrioles to facilitate the elongation of daughter centrioles and for the persistence of CPAP on preexisting mother centrioles. PMID: 24700465
CPAP depletion results in asymmetric spindle poles with uneven distribution of pericentriolar material. PMID: 24491538
Sas-4 acts as a vehicle to tether PCM complexes to centrioles independent of its well-established role in centriole duplication. PMID: 24385583
CEP120 associates with SPICE1 and CPAP, and depletion of any of these proteins results in short procentrioles. Moreover, CEP120 or CPAP overexpression leads to excessive centriole elongation, a process dependent on CEP120, SPICE1, and CPAP. PMID: 23810536
SUMOylated CPAP could synergistically increase the HBx-induced NF-kappaB activity. PMID: 23369793
CEP120 is a CPAP-interacting protein that positively regulates centriole elongation. PMID: 23857771
Authors propose that CEP135 directly connects the central hub protein, hSAS-6, to the outer microtubules, and suggest that this interaction stabilizes the proper cartwheel structure for further CPAP-mediated centriole elongation. PMID: 23511974
CPAP degradation and function are controlled by the poly(ADP-ribose) polymerase tankyrase 1. PMID: 22699936
STIL and CPAP are essential for centriole formation and for proper spindle position. PMID: 22100914
Results suggest that Cep152 recruits Plk4 and CPAP to the centrosome to ensure a faithful centrosome duplication process. PMID: 21059844
Data establishes that mutation of CENPJ can lead to Seckel syndrome and calls for further investigation of the role played by other microcephaly-related genes in the pathogenesis of PD. PMID: 20522431
Results identify centrosomal P4.1-associated protein (CPAP), a human homologue of SAS-4, as a substrate of PLK2 whose activity oscillates during the cell cycle. PMID: 20531387
Cell cycle-regulated phosphorylation orchestrates the dynamics of CPAP molecular interaction and centrosome splitting to ensure genomic stability in cell division. PMID: 19889632
CPAP was found to augment Stat5-mediated transcription. PMID: 12198240
CPAP possesses a novel microtubule-destabilizing motif that not only inhibits microtubule nucleation from the centrosome but also depolymerizes taxol-stabilized microtubules. PMID: 15047868
CPAP functions as a coactivator of NF-kappaB-mediated transcription. PMID: 15687488
Mutations in the CENPJ gene are associated with autosomal recessive primary microcephaly. PMID: 15793586
In conclusion, our findings reveal a structural role for CPAP in maintaining centrosome integrity and normal spindle morphology during cell division. PMID: 16316625
In summary, our results demonstrate a direct interaction between CPAP and 14-3-3, and this interaction appears to be phosphorylation and cell cycle dependent. PMID: 16516142
This research discusses CENPJ, which similarly exhibits a higher rate of protein evolution in primates compared to rodents and carnivores. PMID: 16631324
High levels of LIP1 were found in the serum and synovial fluid of rheumatoid arthritis patients, providing evidence for a cytokine-like role. PMID: 18162190
Mutations in this conserved sequence also eliminate d-SAS-4's microtubule-destabilizing activity, suggesting that d-SAS-4 and CPAP may play similar roles within cells. PMID: 18586240
The PN2-3 fragment of CPAP is identified as a protein with an unprecedented tubulin sequestering mechanism distinct from that of stathmin family proteins. PMID: 19131341
Results indicate that CPAP and CP110 play antagonistic roles in determining the extent of tubulin addition during centriole elongation, thereby controlling the length of newly formed centrioles. PMID: 19481458
Data shows that CPAP is required for centrosome duplication in cycling human cells, and CPAP overexpression results in the formation of abnormally long centrioles. PMID: 19481460
Results suggest that CPAP is a novel regulator of centriole length, and its intrinsic tubulin-dimer binding activity is required for procentriole elongation. PMID: 19503075
This study identifies CENPJ as LYST-interacting proteins LIP1 and LIP7, which interact with the lysosomal trafficking regulator (LYST) protein. PMID: 11984006