scholarly journals Regulation of p27 Degradation and S-Phase Progression by Ro52 RING Finger Protein

2006 ◽  
Vol 26 (16) ◽  
pp. 5994-6004 ◽  
Author(s):  
Abdelmajid Sabile ◽  
Andrea Michael Meyer ◽  
Christiane Wirbelauer ◽  
Daniel Hess ◽  
Ulrike Kogel ◽  
...  
Keyword(s):  
Mammalian Cells ◽  
Kinase Inhibitor ◽  
Ring Finger ◽  
E3 Ligase ◽  
S Phase ◽  
Dependent Manner ◽  
Ring Finger Protein ◽  
Catalytic Core ◽  
Finger Protein ◽  
Phase Progression

ABSTRACT Ubiquitin-mediated degradation of the cyclin-dependent kinase inhibitor p27 provides a powerful route for enforcing normal progression through the mammalian cell cycle. According to a current model, the ubiquitination of p27 during S-phase progression is mediated by SCFSkp2 E3 ligase that captures Thr187-phosphorylated p27 by means of the F-box protein Skp2, which in turn couples the bound substrate via Skp1 to a catalytic core complex composed of Cul1 and the Rbx/Roc RING finger protein. Here we identify Skp2 as a component of an Skp1-cullin-F-box complex that is based on a Cul1-Ro52 RING finger B-box coiled-coil motif family protein catalytic core. Ro52-containing complexes display E3 ligase activity and promote the ubiquitination of Thr187-phosphorylated p27 in a RING-dependent manner in vitro. The knockdown of Ro52 expression in human cells with small interfering RNAs causes the accumulation of p27 and the failure of cells to enter S phase. Importantly, these effects are abrogated by the simultaneous removal of p27. Taken together, these data suggest a key role for Ro52 RING finger protein in the regulation of p27 degradation and S-phase progression in mammalian cells and provide evidence for the existence of a Cul1-based catalytic core that utilizes Ro52 RING protein to promote ubiquitination.

Molecular Functions of Rice Cytosol-Localized RING Finger Protein 1 in Response to Salt and Drought and Comparative Analysis of Its Grass Orthologs

2019 ◽  
Vol 60 (11) ◽  
pp. 2394-2409 ◽  
Author(s):  
Yong Chan Park ◽  
Seung Young Choi ◽  
Jong Ho Kim ◽  
Cheol Seong Jang
Keyword(s):  
Higher Plants ◽  
Ring Finger ◽  
E3 Ligase ◽  
26S Proteasome ◽  
Dependent Manner ◽  
Ring Finger Protein ◽  
Target Proteins ◽  
Finger Protein ◽  
Molecular Functions ◽  
Salt And Drought Stresses

Abstract In higher plants, the post-translational modification of target proteins via the attachment of molecules such as ubiquitin (Ub) mediates a variety of cellular functions via the Ub/26S proteasome system. Here, a really interesting new gene (RING)-H2 type E3 ligase, which regulates target proteins via the Ub/26S proteasome system, was isolated from a rice plant, and its other grass orthologs were examined to determine the evolution of its molecular function during speciation. The gene encoding Oryza sativa cytoplasmic-localized RING finger protein 1 (OsCLR1) was highly expressed under salt and drought stresses. By contrast, the three grass orthologs, SbCLR1 from Sorghum bicolor, ZmCLR1 from Zea mays and TaCLR1 from Triticum aestivum, showed different responses to these stresses. Despite these differences, all four orthologs exhibited E3 ligase activity with cytosol-targeted localization, demonstrating conserved molecular functions. Although OsCLR1-overexpressing plants showed higher survival rates under both salt and drought stresses than that of the wild type (WT) plants, this pattern was not observed in the other orthologs. In addition, OsCLR1-overexpressing plants exhibited lower germination rates in ABA than that of WT plants, whereas the three ortholog CLR1-overexpressing plants showed rates similar to the WT plants. These results indicate the positive regulation of OsCLR1 in response to salt and drought in an ABA-dependent manner. Despite the molecular functions of the three CLR1 orthologs remaining largely unknown, our results provide an insight into the evolutionary fate of CLR1 grass orthologs during speciation after the divergence from a common ancestor.

scholarly journals HTLV-1 Tax Stimulates Ubiquitin E3 Ligase, Ring Finger Protein 8, to Assemble Lysine 63-Linked Polyubiquitin Chains for TAK1 and IKK Activation

2015 ◽  
Vol 11 (8) ◽  
pp. e1005102 ◽  
Author(s):  
Yik-Khuan Ho ◽  
Huijun Zhi ◽  
Tara Bowlin ◽  
Batsukh Dorjbal ◽  
Subha Philip ◽  
...  
Keyword(s):  
Ring Finger ◽  
E3 Ligase ◽  
Ring Finger Protein ◽  
Polyubiquitin Chains ◽  
Ubiquitin E3 Ligase ◽  
Finger Protein

scholarly journals Multiple modification and protein interaction signals drive the Ring finger protein 11 (RNF11) E3 ligase to the endosomal compartment

Oncogene ◽  
2010 ◽  
Vol 29 (41) ◽  
pp. 5604-5618 ◽  
Author(s):  
E Santonico ◽  
F Belleudi ◽  
S Panni ◽  
M R Torrisi ◽  
G Cesareni ◽  
...  
Keyword(s):  
Protein Interaction ◽  
Ring Finger ◽  
E3 Ligase ◽  
Ring Finger Protein ◽  
Endosomal Compartment ◽  
Finger Protein

scholarly journals Identification of a Novel RING Finger Protein as a Coregulator in Steroid Receptor-Mediated Gene Transcription

1998 ◽  
Vol 18 (9) ◽  
pp. 5128-5139 ◽  
Author(s):  
Anu-Maarit Moilanen ◽  
Hetti Poukka ◽  
Ulla Karvonen ◽  
Marika Häkli ◽  
Olli A. Jänne ◽  
...  
Keyword(s):  
Mammalian Cells ◽  
Ring Finger ◽  
Steroid Receptor ◽  
Rat Tissues ◽  
Physical Interaction ◽  
Ring Finger Protein ◽  
Basal Transcription ◽  
Cell Extracts ◽  
Finger Protein

ABSTRACT Using the DNA-binding domain of androgen receptor (AR) as a bait in a yeast two-hybrid screening, we have identified a small nuclear RING finger protein, termed SNURF, that interacts with AR in a hormone-dependent fashion in both yeast and mammalian cells. Physical interaction between AR and SNURF was demonstrated by coimmunoprecipitation from cell extracts and by protein-protein affinity chromatography. Rat SNURF is a highly hydrophilic protein consisting of 194 amino acid residues and comprising a consensus C3HC4 zinc finger (RING) structure in the C-terminal region and a bipartite nuclear localization signal near the N terminus. Immunohistochemical experiments indicated that SNURF is a nuclear protein. SNURF mRNA is expressed in a variety of human and rat tissues. Overexpression of SNURF in cultured mammalian cells enhanced not only androgen, glucocorticoid, and progesterone receptor-dependent transactivation but also basal transcription from steroid-regulated promoters. Mutation of two of the potential Zn2+coordinating cysteines to serines in the RING finger completely abolished the ability of SNURF to enhance basal transcription, whereas its ability to activate steroid receptor-dependent transcription was maintained, suggesting that there are separate domains in SNURF that mediate interactions with different regulatory factors. SNURF is capable of interacting in vitro with the TATA-binding protein, and the RING finger domain is needed for this interaction. Collectively, we have identified and characterized a ubiquitously expressed RING finger protein, SNURF, that may function as a bridging factor and regulate steroid receptor-dependent transcription by a mechanism different from those of previously identified coactivator or integrator proteins.

scholarly journals The functional analysis of Cullin 7 E3 ubiquitin ligases in cancer

Oncogenesis ◽  
2020 ◽  
Vol 9 (10) ◽  
Author(s):  
Le Shi ◽  
Dongyue Du ◽  
Yunhua Peng ◽  
Jiankang Liu ◽  
Jiangang Long
Keyword(s):  
Ring Finger ◽  
Tumor Promotion ◽  
Dependent Manner ◽  
Ring Finger Protein ◽  
E3 Ligases ◽  
Finger Protein ◽  
Novel Complex ◽  
Cullin 7 ◽  
Potential Use

Abstract Cullin (CUL) proteins have critical roles in development and cancer, however few studies on CUL7 have been reported due to its characteristic molecular structure. CUL7 forms a complex with the ROC1 ring finger protein, and only two F-box proteins Fbxw8 and Fbxw11 have been shown to bind to CUL7. Interestingly, CUL7 can interact with its substrates by forming a novel complex that is independent of these two F-box proteins. The biological implications of CUL-ring ligase 7 (CRL7) suggest that the CRL7 may not only perform a proteolytic function but may also play a non-proteolytic role. Among the existing studied CRL7-based E3 ligases, CUL7 exerts both tumor promotion and suppression in a context-dependent manner. Currently, the mechanism of CUL7 in cancer remains unclear, and no studies have addressed potential therapies targeting CUL7. Consistent with the roles of the various CRL7 adaptors exhibit, targeting CRL7 might be an effective strategy for cancer prevention and treatment. We systematically describe the recent major advances in understanding the role of the CUL7 E3 ligase in cancer and further summarize its potential use in clinical therapy.

scholarly journals C-Terminal Ubiquitination of p53 Contributes to Nuclear Export

2001 ◽  
Vol 21 (24) ◽  
pp. 8521-8532 ◽  
Author(s):  
Marion A. E. Lohrum ◽  
Douglas B. Woods ◽  
Robert L. Ludwig ◽  
Éva Bálint ◽  
Karen H. Vousden
Keyword(s):  
Nuclear Export ◽  
P53 Protein ◽  
Ring Finger ◽  
E3 Ligase ◽  
Related Protein ◽  
Ring Finger Protein ◽  
Rapid Degradation ◽  
Finger Protein ◽  
C Terminus ◽  
Growth Inhibitory

ABSTRACT The growth inhibitory functions of p53 are controlled in unstressed cells by rapid degradation of the p53 protein. One of the principal regulators of p53 stability is MDM2, a RING finger protein that functions as an E3 ligase to ubiquitinate p53. MDM2 promotes p53 nuclear export, and in this study, we show that ubiquitination of the C terminus of p53 by MDM2 contributes to the efficient export of p53 from the nucleus to the cytoplasm. In contrast, MDM2 did not promote nuclear export of the p53-related protein, p73. p53 nuclear export was enhanced by overexpression of the export receptor CRM1, although no significant relocalization of MDM2 was seen in response to CRM1. However, nuclear export driven by CRM1 overexpression did not result in the degradation of p53, and nuclear export was not essential for p53 degradation. These results indicate that MDM2 mediated ubiquitination of p53 contributes to both nuclear export and degradation of p53 but that these activities are not absolutely dependent on each other.

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