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| Domain hiding | Altered binding specificity | Motif hiding | Composite binding site formation |
| Uncategorised | Rheostatic | Allostery | Avidity-sensing |
| Physicochemical compatibility | Pre-translational | Competition |
| Protein | Motif | Start | End | Switch description | Information |
Type: Specificity Subtype: Domain hiding | |||||||
| A domain can be sterically masked by binding of an effector when there is a large difference in intrinsic affinity of the domain for different binding partners, or a large difference in the local abundance of these partners, thereby precluding further interactions of the domain. Binding of the masking molecule can be PTM-dependent or -independent. | |||||||
| SCNNG_HUMAN | LIG_WW_1 | 624 | 627 | Phosphorylation of Isoform Nedd4-2a of E3 ubiquitin-protein ligase NEDD4-like (NEDD4L) by Serine/threonine-protein kinase Sgk1 (SGK1) induces binding to 14-3-3 protein eta (YWHAH). This inhibits (whether allosterically or sterically is not known) interactions of NEDD4L via its WW domains with the PY motif in Amiloride-sensitive sodium channel subunit gamma (SCNN1G) (ENaC). As a result, ENaC does not get degraded and ENaC-mediated Na+ currents increase. | |||
Type: Specificity Subtype: Competition | |||||||
| Competitive binding of multiple binding partners to overlapping or adjacent, mutually exclusive interaction interfaces depends on local target protein abundance, which can be regulated by changing the expression level or subcellular localisation of the competitors, or by scaffolding. | |||||||
| DAG1_HUMAN | LIG_WW_1 | 889 | 892 | The WW-binding motif for Dystrophin (DMD) and the SH3-binding motif for Growth factor receptor-bound protein 2 (GRB2) on Dystroglycan (DAG1) overlap, making their interactions mutually exclusive and competitive. | |||
| DAG1_HUMAN | LIG_WW_1 | 889 | 892 | The WW-binding motif for Dystrophin (DMD) and the SH3-binding motif for Growth factor receptor-bound protein 2 (GRB2) on Dystroglycan (DAG1) overlap, making their interactions mutually exclusive and competitive. | |||
| P73_HUMAN | LIG_WW_1 | 484 | 487 | The transcriptional coactivator YAP1 and the ubiquitin ligase Itch competitively bind to the same WW-binding motif of p73. Binding of YAP1 prevents Itch-mediated ubiquitylation of p73, resulting in stabilisation, and increases trancriptional activity of p73. | |||
| P73_HUMAN | LIG_WW_1 | 484 | 487 | The transcriptional coactivator YAP1 and the ubiquitin ligase Itch competitively bind to the same WW-binding motif of p73. Binding of YAP1 prevents Itch-mediated ubiquitylation of p73, resulting in stabilisation, and increases trancriptional activity of p73. | |||
Type: Avidity‑sensing Subtype: | |||||||
| Multiple low-affinity interactions give rise to high-avidity interactions that have increased binding strength, with more than additive affinity. | |||||||
| SMAD3_HUMAN | LIG_WW_1 | 181 | 184 | CDK8/9 phosphorylates Mothers against decapentaplegic homolog 3 (SMAD3) at T179 and S208. Phosphorylation of T179 creates a binding site for the WW domain of Peptidyl-prolyl cis-trans isomerase NIMA-interacting 1 (PIN1), while phosphorylation of S208 primes SMAD3 for phosphorylation of S204 by Glycogen synthase kinase-3 beta (GSK3B). The pS204-pS208 forms a binding site for the third WW domain of the E3 ubiquitin-protein ligase NEDD4-like (NEDD4L), whose second WW domain will displace the WW domain of PIN1 at the pT179-PY box site of SMAD3. This regulation couples SMAD3 activation to SMAD3 destruction in an ordered fashion. Dual phosphorylation of the two NEDD4L-binding sites mediates high-avidity binding of two WW domains of NEDD4L to SMAD3. See also switch details and switch details. | |||
Type: Binary Subtype: Physicochemical compatibility | |||||||
| PTM of a residue in a motif or in its flanking regions alters the physicochemical and/or structural compatibility of the motif with its binding partner. This can either induce or enhance an interaction, or result in inhibition or even abrogation of an interaction. | |||||||
| JUN_MOUSE | LIG_WW_1 | 167 | 170 | Phosphorylation of Y170 in the WW-binding motif of Transcription factor AP-1 (Jun) by Tyrosine-protein kinase ABL1 (Abl1) blocks binding to the E3 ubiquitin-protein ligase Itchy (Itch). As a result, Transcription factor AP-1 (Jun) is not ubiquitylated by E3 ubiquitin-protein ligase Itchy (Itch), and thus not targeted for proteasomal degradation. Regulation of transcriptional activity of Transcription factor AP-1 (Jun) by Tyrosine-protein kinase ABL1 (Abl1) required translocation of the kinase to the nucleus, which was triggered by T cell activation. | |||
Type: Binary Subtype: Pre‑translational | |||||||
| Pre-translational mechanisms such as alternative splicing, alternative promoter-usage and/or RNA editing result in inclusion or removal of exons that contain an entire or partial motif. | |||||||
| AMOT_HUMAN | LIG_WW_1 | 239 | 242 | Alternative splicing removes the WW-binding motif of Angiomotin (AMOT), abrogating binding to Yorkie homolog (YAP1). The splice specific Isoform p130 of Angiomotin (AMOT) of AMOT works within the Hippo pathway to sequester the transcription coactivator YAP1 away at tight junction. In contrast Isoform p80 of Angiomotin (AMOT) of AMOT lacks WW-binding motif. | |||
| AMOT_HUMAN | LIG_WW_1 | 239 | 242 | Alternative splicing removes the WW-binding motif of Angiomotin (AMOT), abrogating binding to WW domain-containing transcription regulator protein 1 (WWTR1). The splice specific Isoform p130 of Angiomotin (AMOT) of AMOT works within the Hippo pathway to sequester the transcription coactivator YAP1 away at tight junction. In contrast Isoform p80 of Angiomotin (AMOT) of AMOT lacks WW-binding motif. | |||
| ERBB4_HUMAN | LIG_WW_1 | 1053 | 1056 | Alternative splicing removes the WW-binding motif of Receptor tyrosine-protein kinase erbB-4 (ERBB4), abrogating binding to E3 ubiquitin-protein ligase Itchy homolog (ITCH). The presence of a WW-binding motif mediates ERBB4 mono-ubiquitination and endocytosis by the WW domain-containing HECT-type E3 ubiquitin ligase ITCH. | |||
| LMP2_EBVB9 | LIG_WW_1 | 57 | 60 | Alternative splicing removes the WW-binding motif of Latent membrane protein 2 (LMP2), abrogating binding to E3 ubiquitin-protein ligase Itchy (Itch). | |||
| LMP2_EBVB9 | LIG_WW_1 | 98 | 101 | Alternative splicing removes the WW-binding motif of Latent membrane protein 2 (LMP2), abrogating binding to E3 ubiquitin-protein ligase Itchy (Itch). | |||
| LMP2_EBVB9 | LIG_WW_1 | 57 | 60 | Alternative splicing removes the WW-binding motif of Latent membrane protein 2 (LMP2), abrogating binding to E3 ubiquitin-protein ligase Itchy (Itch). | |||
| ERBB4_HUMAN | LIG_WW_1 | 1053 | 1056 | Alternative splicing removes the WW-binding motif of Receptor tyrosine-protein kinase erbB-4 (ERBB4), abrogating binding to E3 ubiquitin-protein ligase Itchy homolog (ITCH). The presence of a WW-binding motif mediates ERBB4 mono-ubiquitination and endocytosis by the WW domain-containing HECT-type E3 ubiquitin ligase ITCH. | |||
| AMOT_HUMAN | LIG_WW_1 | 239 | 242 | Alternative splicing removes the WW-binding motif of Angiomotin (AMOT), abrogating binding to Yorkie homolog (YAP1). The splice specific Isoform p130 of Angiomotin (AMOT) of AMOT works within the Hippo pathway to sequester the transcription coactivator YAP1 away at tight junction. In contrast Isoform p80 of Angiomotin (AMOT) of AMOT lacks WW-binding motif. | |||
Type: Specificity Subtype: Altered binding specificity | |||||||
| The balance of the competition for overlapping or adjacent, mutually exclusive interaction interfaces is tipped in favor of one of the interactors by PTM-dependent modulation of the intrinsic affinity of a binding region. Multiple, successive PTMs allow sequential switching of different binding partners in an ordered manner by step-wise alteration of binding specificity. | |||||||
| SMAD3_HUMAN | LIG_WW_1 | 181 | 184 | CDK8/9 phosphorylates Mothers against decapentaplegic homolog 3 (SMAD3) at T179 and S208. Phosphorylation of T179 creates a binding site for the WW domain of Peptidyl-prolyl cis-trans isomerase NIMA-interacting 1 (PIN1), while phosphorylation of S208 primes SMAD3 for phosphorylation of S204 by Glycogen synthase kinase-3 beta (GSK3B). The pS204-pS208 forms a binding site for the third WW domain of E3 ubiquitin-protein ligase NEDD4-like (NEDD4L), whose second WW domain will displace the WW domain of PIN1 at the pT179-PY box site of SMAD3. This regulation couples SMAD3 activation to SMAD3 destruction in an ordered fashion. See also switch details and switch details. | |||
| DAG1_HUMAN | LIG_WW_1 | 889 | 892 | Adhesion-dependent phosphorylation of Y892 in Dystroglycan (DAG1) by Src kinase (Proto-oncogene tyrosine-protein kinase Src (SRC)) switches the specificity of DAG1 from the WW domain containing cytoskeletal linker Dystrophin (DMD) to the SH2 domain containing Tyrosine-protein kinase Fyn (FYN). | |||
| DAG1_HUMAN | LIG_WW_1 | 889 | 892 | Adhesion-dependent phosphorylation of Y892 in Dystroglycan (DAG1) by c-Src (SRC) switches the specificity of DAG1 from WW domain containing proteins like Utrophin (UTRN) to SH2 domain containing proteins like Tyrosine-protein kinase CSK (CSK). | |||
| ERBB4_HUMAN | LIG_WW_1 | 1053 | 1056 | Phosphorylation-dependent binding of Receptor tyrosine-protein kinase erbB-4 (ERBB4) to the SH2 domains of Phosphatidylinositol 3-kinase regulatory subunit alpha (PIK3R1) results in signaling activation, while binding to the WW domains of E3 ubiquitin-protein ligase Itchy homolog (ITCH) to unphopshorylated ERBB4 results in ubiquitylation, endocytosis and ultimately degradation of ERBB4. | |||