A TRIP Back in Time to TRIP
Journal of Proteomics & Bioinformatics

Journal of Proteomics & Bioinformatics
Open Access

ISSN: 0974-276X

Review Article - (2018) Volume 11, Issue 8

A TRIP Back in Time to TRIP

Eijaz Ahmed Bhat1* and Irfan Ahmed Rather2
1Department of Chemistry and Biochemistry, School of Natural Science, Yeungnam University, Gyeongsan 712-749, South Korea
2Applied Microbiology and Biotechnology, Yeungnam University, South Korea
*Corresponding Author: Eijaz Ahmed Bhat, Department of Chemistry and Biochemistry, School of Natural Science, Yeungnam University, Gyeongsan 712-749, South Korea, Tel: +82 53-810-2114

Keywords: Apoptosis; Cell proliferation; Mitosis; TRIP; TNFR; RAP80


The studies report that TRIP is a negative factor in down-regulation of proinflammatory cytokine production through the TNF-induced NF-κB activation. More so, TRIP is used in pathways and processes like protein-protein interactions, TNF-induced signaling pathway, ubiquitination Assays, TNF-induced Signaling Pathway, TNF-induced p65 Nuclear Translocation Assay, Real-time PCR Analysis, Enzyme-linked Immunosorbent Assay (ELISA), Cytokine Expression Array, and Statistical Analysis. Furthermore, it acts as a regulator of TNF-induced inflammatory response. TRAF2 has a RING domain that participates in ligase activity. TRIP is also used in preventing Lys63-linked TRAF2 Ubiquitination through engagement of TNF receptor associated factor and TRAF-interacting protein. Similarly, TRIP destructively regulates ubiquitination mediated by TRAF-2. Additionally, it negatively affects TNF-induced NF-κB activation via the prevention of a RING domain in ligase. The research shows that TRAF-interacting protein is imperative in the activation through down-regulation of p65 phosphorylation. Moreover, TRIP is a factor in human disease and a sky-binding partner. Studies mention that TNF receptor-associated factor (TRAF)-interacting protein (TRIP) is a novel SyK-binding partner. Other than being a binding partner, TRIP is a factor in the pathogenesis of human diseases. TRIP-deficient mouse models have laid the basis to understand the roles of TRIP in the pathogenesis of human diseases. TRIP is also a key partner in DNA damage response. In fact, previous researches discovered that TRIP is found in DNA replication compartments particularly in DNA damage responses. Further studies show that TRIP also influences mitosis. According to Lee et al., TRIP acts as a novel binding agent of RAP80. It uses a yeast two-hybrid system. As such, it plays a critical role in the conscription of RAP80 to deoxy-ribonucleic acid lesions. Therefore, TRIP is a significant factor in different signaling processes and pathways.


Tumor necrosis factor receptor (TNFR)-associated factors (TRAFs) are key adaptor molecules in the TNF-signaling pathway and induce a wide range of biological processes including cell proliferation, activation, differentiation, and apoptosis. TRAF members directly interact with the TNFR super-family via their cytoplasmic domains [1]. Cytoplasmic domains of TNFR lack catalytic activity and possess no significant homology to each other or other known proteins [2]. To date, TRAF1-7 has been identified. Except for TRAF7, other TRAF members possess a conserved TRAF domain which is composed of (~230 amino acid length) TRAF-N and TRAF-C domain which plays a pivotal role in TRAF signaling complexes by interacting directly via cytoplasmic regions of TNFR superfamily. It is now clear that TRAF-N domain mediates the interaction with different intracellular signaling molecules. TNFR super-family members recruit several types of signal transducer molecules which have been identified to initiates different signaling pathways. Moreover, one class of signal- Transducing molecules are recruited to Fas (CD90) or TNFR1 via their death domain. For example, through their respective Death domain interactions, Fas (CD95) and TNFR1 recruit FADD (MORT1)/RIP or TRADD/FADD/RIP. Association of these signal transducers lead to the recruitment of FLICE/MACH and finally causes cell death [3].

Tumor necrosis factor receptor (TNFR)-associated factors (TRAFs) are second class of signal transducers, recruited by TNFR superfamily via their cytoplasmic interactions and either activates or suppresses the NF-Kb or JNK pathway. The ability of TRAF’s to bind TNFR2, CD30, CD40, and LT-BR has been identified by their biochemical studies. The interaction of these receptors with TRAFs occur directly via a short stretch of amino acids within cytoplasmic tails, but don’t interact with proteins contains Death domains [4]. TRAF-interaction Protein (TRIP) a signaling molecule directly associated with TRAF1 and TRAF2 proteins leads to downstream inhibition of NF-kB inhibition. TRIP is composed of 469 amino-acids with annotated domains including an N-terminal E3 Ubiquitin ligase activity Ring Finger motif followed by Coiled-coil and Leucine Zipper domain that is engaged in the TRAF-mediated signaling [5]. Initially, TRIP has been recognized as TNF interacting protein by Yeast Two-hybrid assay, directly interacts with the TRAF1 and TRAF2 proteins, which leads to the inhibition of NF-kB activation. TRIP has emerged a novel binding protein which negatively regulates the NF-KB activation through the TNFR2- and CD30 signaling complexes. TRIP plays multifunctional roles in antiviral response, cell proliferation, and apoptosis. However, recently, it has been shown that TRIP is more related to DNA stability, cell cycle progression by direct interaction with other binding partners. The critical role of TRIP in Cell cycle progression, DNA repair pathways, DNA damage response and embryonic development, have increased our interest in exploring how TRIP interact with different binding partners. Despite being involved in cell signaling and human diseases, the physiological significance and precise role of TRIP have not been yet clearly known. TRIP is a member of RINGtype E3 Ubiquitin ligase family that undergoes autoubiquitination, but no studies have shown clearly its physiological functions and its substrates like NOPO a Drosophila homolog of human gene encoding TRIP till now. The E3 ring domain is followed by the Coiled-Coil and Leucine zipper domain which is critical for the protein-protein interaction. Different studies were carried to find out which domain of the protein is critical for the protein-protein interaction. However more need to be done about this protein signaling complexes. Moreover, the response shown by N-terminal RING domain of TRIP for degradation of TBK1 is mediated by ubiquitination and has been shown to be involved in TLR3/4- and RIG-I–mediated IFN-β signaling and antiviral responses [4].

Role of TRIP in Different Signaling Processes

TRIP in TRAF signaling pathway

Initially, TRIP has been reported as the binding partner of TRAF1 and TRAF2 in a Two-Hybrid screen, suppresses the NF-ƙB activation by directly binds to the TRAF1 and TRAF2 without an unseen mechanism. Members of the tumor necrosis factor (TNF) family elicit a diverse range of biological responses including cellular proliferation, differentiation, and apoptosis. The tumor necrosis receptor (TNFR) and toll-like receptor (TLR) family are signaling pathways in which TRAF proteins play important roles in the immune system and acts as a key adaptor signaling molecules which govern downstream signal. To date, TRAF1-7 has been identified in mammals. Various studies have been shown that TRIPCC is important for the interaction of CC domain of TRAF1 and TRAF2 and have shown negatively regulates the activation of NF-Kβ as shown in Figure 1. This inhibition is independent of the E3 Ubiquitin ligase activity and occurs probably by interference with receptor recruitment of TRAF proteins [6]. The Lung cancer development is associated with the TRAF family members, specifically TRAF6 promoted the cell death of lung cancer cells [7]. Moreover, TRAF2 through the interaction with TRAF interacting protein with a forkhead associated (FHA) domain (TIFA) associated with a signal transduction leads the lung cancer development [8-10].


Figure 1: Role of TRIP in TRAF2 mediated NF-KB signaling pathway leading to either cell activation or cell death in NF-KB signaling pathway. TRIP interacts with TRAF1 and TRAF2 via CC domain and inhibit the function of TRAF1 and TRAF2.

TRIP in RAP80 signaling pathway

Receptor-associated protein 80 (RAP80) is one of the elements in BRCA1-A complex [11]. Its role is to recruit BRCA1 to DNA lesion locus in deoxy-ribonucleic acid in ubiquitin signaling pathway. It is needed for BRCA1 and BRCC36 localization of DSBs [12]. According to Lee et al., TRIP acts as a novel binding agent of RAP80 through a yeast two-hybrid system. The results of the study revealed that TRAIP is one of the upstream controllers for RAP80. As such, it plays a critical role in the conscription of RAP80 to deoxy-ribonucleic acid lesions in a proper way. This happens with the presence of an identified K-63- lined polyubiquitin appreciation at the locus of deoxy-ribonucleic acid damage. When there is no damage to the DNA, both TRIP and RAP80 are retained. The retention of both happens in PML nuclear bodies. However, when there is DNA damage, TRIP might translocate RAP80 to where the damage has occurred. It does so through the guidance of RNF20–RNF40 complex which is integral in H2B ubiquitination at the locus of DNA damage. Because of this, TRIP ends up conscripting BRCA1 complex next to the locus DNA damage occurred [13]. It does this by interrelating with RAP80 allowing DNA lesion checkpoint and the HR repair. The lack of RNF8/168 regulation by deleting TRIP lead to the localization of 53BP1. Nonetheless, when TRIP is not present, then the translocation of RAP80 takes place. Hence, the downstream targets of RAP80 are conceded for its retention at the damage locus. Therefore, it can be said the localization of RAP80 is directly dependent on TRIP even in the absence of Deoxy-ribonucleic acid lesions. As such, it can be concluded that TRIP has a controlling function on RAP80 particularly in PML nuclear bodies [2]. The findings from the research revealed that TRIP transports RAP80 from PML nuclear bodies to the locus where the damage had occurred. This happens through the interaction with one of the domains of TRAF-interacting protein. It also happens because of the interaction with C-terminal region ZF of RAP80 [14]. Nonetheless, if there is deletion of C-terminal, RAP80 mutant finds it difficult in assembling at the DNA damage locus. It will only undergo a slow translocation to the damaged sites showing that TRIP is important in altering recruitment accumulation because of the DNA lesions.

TRIP in cell cycle process or mitosis

Besides having an integral role as a novel binding agent of RAP80, TRIP also influences mitosis. Mitosis is a kind of cell division that leads to two daughter cells having similar number and types of chromosomes as parent nucleus. Cell division in mitosis involve many processes including chromosome separation. Proper chromosome separation in mitosis is temporally and spatially undertaken by set systems. Limitations in the checkpoints are the cause of errors happening during chromosome segregation and aneuploidy. As such, it ends up encouraging and fostering tumorigenesis [15]. According to this research, TRIP at most times is located near mitotic chromosomes. Cells that do not have TRIP tend to bypass taxol-induced mitotic arrests and illustrates lowered kinetochore levels of MAD2; this, however, does not happen on other spindle checkpoint proteins that have nocodazole [16]. These findings show that TRIP governs the spindle assembly checkpoint. It also regulates the proper cellular distribution of chromosomes, hence, aiding mitosis [6]. Moreover, research further reveals that TRIP is imperative for cell proliferation and organismal development. Even though TRIP is in most cases known as a negative regulator, it can be used in genome stability maintenance which is particularly arrested in mitosis [6]. This concept is further augmented by the inactivation of DNA lesions checkpoint kinase enhanced by nopo-related phenotypes giving an aspect that the cells maybe related, to some degree, to mitosis. It also portrays a relation to under-replicated DNA [6]. Nonetheless, the evaluation showed that TRIP plays an important role DNA replication procedure. It is significant to know that mitotic indices of TRIP removal cell populations maybe not be different from the control cells.

TRIP in DNA damage response

In previous researches, it was discovered that TRIP is found at DNA replication compartments particularly in DNA damage responses [17]. According to Harley, Murina, and Jackson (2016), TRIP supports DNA damage response particularly in genome replication. TRIP relocalizes the locus of DNA lesions, where it is needed for optimal phosphorylation of H2ACX and RPA2 in the S-Phase. It is needed for effective cell cycle development and mutations in TRIP, hence, lower cellular proliferation. So, human genetics states that TRIP is a component of deoxy-ribonucleic damage response (Harley, Murina & Jackson 2016). Moreover, many researchers have identified TRIP as a factor that participates in the recruitment of polymerase eta into the locus of DNA damage [18]. It is a factor said to interact with the Y-family translesion deoxy-ribonucleic polymerases. At the C-terminus, TRAIP has a motif that locates itself on deoxy-ribonucleic lacerations or DNA under duress. They also relocalize to γH2AX-marked DNA abrasions.

It marks PCNA to enable its change from chromatin. Other than this, TRIP has a direct role in DNA synthesis. Research reports that the inactivation of TRIP lead to a detrimentally affected DNA synthesis in nucleotide insufficiency [19]. This, in turn, leads to the hindrance of genome stability. The research also discovered that TRIP is an important factor in mammalian replicative stress reaction network. It is also significant in the dynamic PCNA change as it fosters proper and genuine duplication of the genetic material. Remarkably, TRIP proteins are said to be found in large quantities in the nucleoli which is the storage point for numerous DDR proteins. This brings about the probability the E3 ubiquitin ligase signature motif being an agent of offering a structural scaffold aiding in the localization of TRIP in the subcellular chambers. From this perspective, it is safe to report that TRIP insufficiency may lead to a rise in the micronuclei development rate. Nonetheless, the re-introduction of TRIP leads to the decline in the formation [20]. Further reports will show that TRIP has a direct role in the replicative functions responses.

TRIP as a SyK-binding partner

TNF receptor-associated factor (TRAF)-interacting protein (TRIP) was identified a novel binding partner of SyK non-receptor protein tyrosine kinase by yeast two hybrid assay. The C-terminal region of TRIP mediates this interaction and strengthen the interaction with TNF and tyrosine phosphorylation of SyK on the treatment of cells. SyK is a tumor suppressor which regulates the malignant progression of breast cancer and expressed in normal breast epithelia. In breast cancer cells, interaction of TRIP with SyK will lead to the opposing effects on the TNF signaling pathway [21]. Activation of NF-KB is raised by Sky while TRIP suppress the activation of NF-KB. Phosphorylation at tyrosine residues of activated Sky by TNF-α promotes its binding to TRIP. Furthermore, binding of activated SyK to TRIP causes phosphorylation of TRIP. In breast cell cancer lines, the ectopically co-expressed TRIP and SyK co- localized in cytosolic punctuate complex in a small percentage of cells. The increased level of punctate complexes by TNF-α suggesting that SyK might facilitate the nuclear export of TRIP as it has been reported in previous studies to shuttle between the cytoplasm and nucleus.

TRIP in human diseases

Studies from mouse models with TRIP-deficient have shown the basis to understand the role of TRIP in the pathogenesis of human diseases [22]. By possessing their importance in regulating the embryonic development, proliferation and cell survival in different cell types, the aberrant functions of TRIP may lead to the different diseases. TRIP ablation results in early embryonic lethality in mice [5]. As shown previously that TRIP interacts with the tumor suppressors such as SyK and CYLD are involved in the formation of skin appendages such as cylindroma, trichoepithelioma and spiradenoma for CYLD and melanomas and breast tumors for both CYLD and SyK. In basal cell carcinomas and in multiple breast epithelial cell lines, an increased expression of TRIP with oncogenic potentials ranging from non-malignant to highly invasive. Rheumatoid arthritis (RA) is a kind of chronic inflammatory disorder, that eventually result the destruction of cartilage and bone [23]. Studies have shown that TRIP expression in RA-FLS was impaired as compared with osteoarthritis- (OA-) FLS and activation of NF-


TRIP plays different roles in various signaling processes. In TRAF signaling pathway, it acts as a binding partner in Two-Hybrid screen inhibiting NF-κB activation. In the RAP80 signaling pathway, TRIP acts as a novel binding agent of RAP80 through a yeast two-hybrid system. One of the studies showed that TRIP is one of the upstream controllers for RAP80. So, TRIP plays a critical role in the conspiration of RAP80 to deoxy-ribonucleic acid lesions in a proper way. Furthermore, in the event of DNA damage, TRIP might translocate RAP80 to where the damage is located. Besides being a novel binding agent, TRIP supports DNA damage especially in genome replication. It relocalizes the location of DNA lesions and is needed for effective cell cycle development and mutations in TRIP. TRIP is also a sky-binding partner, participates in pathogenesis of human disease, and embryonic development. Additionally, TRIP is part of other signaling pathways and processes such as protein-protein interactions, TNF-induced signaling pathway, ubiquitination Assays, TNF-induced Signaling Pathway, TNF-induced p65 Nuclear Translocation Assay, Real-time PCR Analysis, Enzyme-linked Immunosorbent Assay (ELISA), Cytokine Expression Array, Statistical Analysis, mitosis, and DNA damage response. The accumulated data of TRIP in vitro and in vivo will further help to elucidate the molecular mechanism of TRIP on TRAF2 mediated NF-KB signaling which is an unanswered open question in TRAF-mediated biology. Moreover, the recent roles of TRIP in DNA damage response need to be fully addressed and which domain of TRIP inhibits the TRAF-mediated NF-KB activation need to be confirmed.

Author Contribution

The author being the sole contributor of this work and approved it for publication.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationship that could be constructed as a potential conflict of interest.


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Citation: Bhat EA, Rather IA (2018) “A TRIP Back in Time to TRIP”. J Proteomics Bioinform 11: 138-142.

Copyright: © 2018 Bhat EA, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.