Orhi Barroso Gomila

RESEARCH, TEACHING, or OTHER INTERESTS

Biochemistry, Genetics and Molecular Biology, Cancer Research, Cell Biology, Biotechnology

Scopus Publications

Cullin-RING ligase BioE3 reveals molecular-glue-induced neosubstrates and rewiring of the endogenous Cereblon ubiquitome
Laura Merino-Cacho, Orhi Barroso-Gomila, Mónica Pozo-Rodríguez, Veronica Muratore, Claudia Guinea-Pérez, Álvaro Serrano, Coralia Pérez, Sandra Cano-López, Ainhoa Urcullu, Mikel Azkargorta,et al.
Springer Science and Business Media LLC
Abstract Background The specificity of the ubiquitination process is mediated by the E3 ligases. Discriminating genuine substrates of E3s from mere interacting proteins is one of the major challenges in the field. We previously developed BioE3, a biotin-based approach that uses BirA-E3 fusions together with ubiquitin fused to a low-affinity AviTag to obtain a site-specific and proximity-dependent biotinylation of the substrates. We proved the suitability of BioE3 to identify targets of RING and HECT-type E3 ligases. Methods BioE3 experiments were performed in HEK293FT and U2OS stable cell lines expressing TRIPZ-bioGEFUb transiently transfected with BirA-cereblon (CRBN). Cells were seeded using biotin-free media, followed later by a short-biotin pulse. We evaluated the applicability of the BioE3 system to CRBN and molecular glues by Western blot and confocal microscopy, blocking the proteasome with bortezomib, inhibiting NEDDylation with MLN4924 and treating the cells with pomalidomide. For the identification of endogenous substrates and neosubstrates we analyzed the eluates of streptavidin pull-downs of BioE3 experiments by LC–MS/MS. Analysis of targets for which ubiquitination changes significantly upon treatment was done using two-sided Student’s t-test. Orthogonal validations were performed by histidine pull-down, GFP-trap and computational modelling. Results Here we demonstrate that BioE3 is suitable for the multi-protein complex Cullin-RING E3s ligases (CRLs), the most utilized E3-type for targeted protein degradation (TPD) strategies. Using CRBN as proof of concept, one of the substrate receptors of CRL4 E3 ligase, we identified both endogenous substrates and novel neosubstrates upon pomalidomide treatment, including CSDE1 which contains a G-loop motif potentially involved in the binding to CRBN in presence of pomalidomide. Importantly, we observed a major rearrangement of the endogenous ubiquitination landscape upon treatment with this molecular glue. Conclusions The ability of BioE3 to detect and compare both substrates and neosubstrates, as well as how substrates change in response to treatments, will facilitate both on-target and off-target identifications and offer a broader characterization and validation of TPD compounds, like molecular glues and PROTACs.


Biotin-Based Strategies to Explore the World of Ubiquitin and Ubiquitin-Like Modifiers
Laura Merino‐Cacho, Orhi Barroso‐Gomila, Sandra Hernández‐Sánchez, Juanma Ramirez, Ugo Mayor, James D. Sutherland, and Rosa Barrio
Wiley
AbstractA complex code of cellular signals is mediated by ubiquitin and ubiquitin‐like (Ub/UbL) modifications on substrate proteins. The so‐called Ubiquitin Code specifies protein fates, such as stability, subcellular localization, functional activation or suppression, and interactions. Hundreds of enzymes are involved in placing and removing Ub/UbL on thousands of substrates, while the consequences of modifications and the mechanisms of specificity are still poorly defined. Challenges include rapid and transient engagement of enzymes and Ub/UbL interactors, low stoichiometry of modified versus non‐modified cellular substrates, and protease‐mediated loss of Ub/UbL in lysates. To decipher this complexity and confront the challenges, many tools have been created to trap and identify substrates and interactors linked to Ub/UbL modification. This review focuses on an assortment of biotin‐based tools developed for this purpose (for example BioUbLs, UbL‐ID, BioE3, BioID), taking advantage of the strong affinity of biotin‐streptavidin and the stringent lysis/washing approach allowed by it, paired with sensitive mass‐spectrometry‐based proteomic methods. Knowing how substrates change during development and disease, the consequences of substrate modification, and matching substrates to particular UbL‐ligating enzymes will contribute new insights into how Ub/UbL signaling works and how it can be exploited for therapies.


BioE3 identifies specific substrates of ubiquitin E3 ligases
Orhi Barroso-Gomila, Laura Merino-Cacho, Veronica Muratore, Coralia Perez, Vincenzo Taibi, Elena Maspero, Mikel Azkargorta, Ibon Iloro, Fredrik Trulsson, Alfred C. O. Vertegaal,et al.
Springer Science and Business Media LLC
AbstractHundreds of E3 ligases play a critical role in recognizing specific substrates for modification by ubiquitin (Ub). Separating genuine targets of E3s from E3-interactors remains a challenge. We present BioE3, a powerful approach for matching substrates to Ub E3 ligases of interest. Using BirA-E3 ligase fusions and bioUb, site-specific biotinylation of Ub-modified substrates of particular E3s facilitates proteomic identification. We show that BioE3 identifies both known and new targets of two RING-type E3 ligases: RNF4 (DNA damage response, PML bodies), and MIB1 (endocytosis, autophagy, centrosome dynamics). Versatile BioE3 identifies targets of an organelle-specific E3 (MARCH5) and a relatively uncharacterized E3 (RNF214). Furthermore, BioE3 works with NEDD4, a HECT-type E3, identifying new targets linked to vesicular trafficking. BioE3 detects altered specificity in response to chemicals, opening avenues for targeted protein degradation, and may be applicable for other Ub-likes (UbLs, e.g., SUMO) and E3 types. BioE3 applications shed light on cellular regulation by the complex UbL network.


SUMO-ID: A Strategy for the Identification of SUMO-Dependent Proximal Interactors
Orhi Barroso-Gomila, Ugo Mayor, Rosa Barrio, and James D. Sutherland
Springer US



Role of SUMOylation in neurodegenerative diseases and inflammation




Studying the ubiquitin code through biotin-based labelling methods
Orhi Barroso-Gomila, Veronica Muratore, Laura Merino-Cacho, Jose Antonio Rodriguez, Rosa Barrio, and James D. Sutherland
Elsevier BV



Identification of proximal SUMO-dependent interactors using SUMO-ID
Orhi Barroso-Gomila, Fredrik Trulsson, Veronica Muratore, Iñigo Canosa, Laura Merino-Cacho, Ana Rosa Cortazar, Coralia Pérez, Mikel Azkargorta, Ibon Iloro, Arkaitz Carracedo,et al.
Springer Science and Business Media LLC
AbstractThe fast dynamics and reversibility of posttranslational modifications by the ubiquitin family pose significant challenges for research. Here we present SUMO-ID, a technology that merges proximity biotinylation by TurboID and protein-fragment complementation to find SUMO-dependent interactors of proteins of interest. We develop an optimized split-TurboID version and show SUMO interaction-dependent labelling of proteins proximal to PML and RANGAP1. SUMO-dependent interactors of PML are involved in transcription, DNA damage, stress response and SUMO modification and are highly enriched in SUMO Interacting Motifs, but may only represent a subset of the total PML proximal proteome. Likewise, SUMO-ID also allow us to identify interactors of SUMOylated SALL1, a less characterized SUMO substrate. Furthermore, using TP53 as a substrate, we identify SUMO1, SUMO2 and Ubiquitin preferential interactors. Thus, SUMO-ID is a powerful tool that allows to study the consequences of SUMO-dependent interactions, and may further unravel the complexity of the ubiquitin code.


SALL1 Modulates CBX4 Stability, Nuclear Bodies, and Regulation of Target Genes
Immacolata Giordano, Lucia Pirone, Veronica Muratore, Eukene Landaluze, Coralia Pérez, Valerie Lang, Elisa Garde-Lapido, Monika Gonzalez-Lopez, Orhi Barroso-Gomila, Alfred C. O. Vertegaal,et al.
Frontiers Media SA
Development is orchestrated through a complex interplay of multiple transcription factors. The comprehension of this interplay will help us to understand developmental processes. Here we analyze the relationship between two key transcription factors: CBX4, a member of the Polycomb Repressive Complex 1 (PRC1), and SALL1, a member of the Spalt-like family with important roles in embryogenesis and limb development. Both proteins localize to nuclear bodies and are modified by the small ubiquitin-like modifier (SUMO). Our results show that CBX4 and SALL1 interact in the nucleoplasm and that increased SALL1 expression reduces ubiquitination of CBX4, enhancing its stability. This is accompanied by an increase in the number and size of CBX4-containing Polycomb bodies, and by a greater repression of CBX4 target genes. Thus, our findings uncover a new way of SALL1-mediated regulation of Polycomb bodies through modulation of CBX4 stability, with consequences in the regulation of its target genes, which could have an impact in cell differentiation and development.


LUZP1, a novel regulator of primary cilia and the actin cytoskeleton, is a contributing factor in townes-brocks syndrome
Laura Bozal-Basterra, María Gonzalez-Santamarta, Veronica Muratore, Aitor Bermejo-Arteagabeitia, Carolina Da Fonseca, Orhi Barroso-Gomila, Mikel Azkargorta, Ibon Iloro, Olatz Pampliega, Ricardo Andrade,et al.
eLife Sciences Publications, Ltd
Primary cilia are sensory organelles crucial for cell signaling during development and organ homeostasis. Cilia arise from centrosomes and their formation and function is governed by numerous factors. Through our studies on Townes-Brocks Syndrome (TBS), a rare disease linked to abnormal cilia formation in human fibroblasts, we uncovered the leucine-zipper protein LUZP1 as an interactor of truncated SALL1, a dominantly-acting protein causing the disease. Using TurboID proximity labeling and pulldowns, we show that LUZP1 associates with factors linked to centrosome and actin filaments. Here, we show that LUZP1 is a cilia regulator. It localizes around the centrioles and to actin cytoskeleton. Loss of LUZP1 reduces F-actin levels, facilitates ciliogenesis and alters Sonic Hedgehog signaling, pointing to a key role in cytoskeleton-cilia interdependency. Truncated SALL1 increases the ubiquitin proteasome-mediated degradation of LUZP1. Together with other factors, alterations in LUZP1 may be contributing to TBS etiology.


SUMOylation in the control of cholesterol homeostasis
Ana Talamillo, Leiore Ajuria, Marco Grillo, Orhi Barroso-Gomila, Ugo Mayor, and Rosa Barrio
The Royal Society
SUMOylation—protein modification by the small ubiquitin-related modifier (SUMO)—affects several cellular processes by modulating the activity, stability, interactions or subcellular localization of a variety of substrates. SUMO modification is involved in most cellular processes required for the maintenance of metabolic homeostasis. Cholesterol is one of the main lipids required to preserve the correct cellular function, contributing to the composition of the plasma membrane and participating in transmembrane receptor signalling. Besides these functions, cholesterol is required for the synthesis of steroid hormones, bile acids, oxysterols and vitamin D. Cholesterol levels need to be tightly regulated: in excess, it is toxic to the cell, and the disruption of its homeostasis is associated with various disorders like atherosclerosis and cardiovascular diseases. This review focuses on the role of SUMO in the regulation of proteins involved in the metabolism of cholesterol.


The role of SUMOylation during development
Ana Talamillo, Orhi Barroso-Gomila, Immacolata Giordano, Leiore Ajuria, Marco Grillo, Ugo Mayor, and Rosa Barrio
Portland Press Ltd.
During the development of multicellular organisms, transcriptional regulation plays an important role in the control of cell growth, differentiation and morphogenesis. SUMOylation is a reversible post-translational process involved in transcriptional regulation through the modification of transcription factors and through chromatin remodelling (either modifying chromatin remodelers or acting as a ‘molecular glue’ by promoting recruitment of chromatin regulators). SUMO modification results in changes in the activity, stability, interactions or localization of its substrates, which affects cellular processes such as cell cycle progression, DNA maintenance and repair or nucleocytoplasmic transport. This review focuses on the role of SUMO machinery and the modification of target proteins during embryonic development and organogenesis of animals, from invertebrates to mammals.


Testing mate choice and overdominance at MH in natural families of Atlantic salmon Salmo salar
C. Tentelier, O. Barroso‐Gomila, O. Lepais, A. Manicki, I. Romero‐Garmendia, and B. M. Jugo
Wiley
This study aimed to test mate choice and selection during early life stages on major histocompatibility (MH) genotype in natural families of Atlantic salmon Salmo salar spawners and juveniles, using nine microsatellites to reconstruct families, one microsatellite linked to an MH class I gene and one minisatellite linked to an MH class II gene. MH‐based mate choice was only detected for the class I locus on the first year, with lower expected heterozygosity in the offspring of actually mated pairs than predicted under random mating. The genotype frequencies of MH‐linked loci observed in the juveniles were compared with frequencies expected from Mendelian inheritance of parental alleles to detect selection during early life stages. No selection was detected on the locus linked to class I gene. For the locus linked to class II gene, observed heterozygosity was higher than expected in the first year and lower in the second year, suggesting overdominance and underdominance, respectively. Within family, juveniles' body size was linked to heterozygosity at the same locus, with longer heterozygotes in the first year and longer homozygotes in the second year. Selection therefore seems to differ from one locus to the other and from year to year.

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