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Mazzone P, Congestrì M, Scudiero I, Polvere I, Voccola S, Zerillo L, Telesio G, Vito P, Stilo R, Zotti T. UBAC1/KPC2 Regulates TLR3 Signaling in Human Keratinocytes through Functional Interaction with the CARD14/ CARMA2sh-TANK Complex. Int J Mol Sci 2020; 21:ijms21249365. [PMID: 33316896 PMCID: PMC7764236 DOI: 10.3390/ijms21249365] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 12/22/2022] Open
Abstract
CARD14/CARMA2 is a scaffold molecule whose genetic alterations are linked to human inherited inflammatory skin disorders. However, the mechanisms through which CARD14/CARMA2 controls innate immune response and chronic inflammation are not well understood. By means of a yeast two-hybrid screening, we identified the UBA Domain Containing 1 (UBAC1), the non-catalytic subunit of the E3 ubiquitin-protein ligase KPC complex, as an interactor of CARMA2sh, the CARD14/CARMA2 isoform mainly expressed in human keratinocytes. UBAC1 participates in the CARMA2sh/TANK complex and promotes K63-linked ubiquitination of TANK. In human keratinocytes, UBAC1 negatively regulates the NF-κF-activating capacity of CARMA2sh following exposure to poly (I:C), an agonist of Toll-like Receptor 3. Overall, our data indicate that UBAC1 participates in the inflammatory signal transduction pathways involving CARMA2sh.
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Affiliation(s)
- Pellegrino Mazzone
- Biogem Consortium, Via Camporeale, 83031 Ariano Irpino (AV), Italy; (P.M.); (I.S.); (G.T.)
| | - Michele Congestrì
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy; (M.C.); (I.P.); (R.S.); (T.Z.)
| | - Ivan Scudiero
- Biogem Consortium, Via Camporeale, 83031 Ariano Irpino (AV), Italy; (P.M.); (I.S.); (G.T.)
| | - Immacolata Polvere
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy; (M.C.); (I.P.); (R.S.); (T.Z.)
- Genus Biotech, Università degli Studi del Sannio, Via Appia snc, 82030 Apollosa (BN), Italy; (S.V.); (L.Z.)
| | - Serena Voccola
- Genus Biotech, Università degli Studi del Sannio, Via Appia snc, 82030 Apollosa (BN), Italy; (S.V.); (L.Z.)
| | - Lucrezia Zerillo
- Genus Biotech, Università degli Studi del Sannio, Via Appia snc, 82030 Apollosa (BN), Italy; (S.V.); (L.Z.)
| | - Gianluca Telesio
- Biogem Consortium, Via Camporeale, 83031 Ariano Irpino (AV), Italy; (P.M.); (I.S.); (G.T.)
| | - Pasquale Vito
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy; (M.C.); (I.P.); (R.S.); (T.Z.)
- Genus Biotech, Università degli Studi del Sannio, Via Appia snc, 82030 Apollosa (BN), Italy; (S.V.); (L.Z.)
- Correspondence: ; Tel.: +39-0824305105
| | - Romania Stilo
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy; (M.C.); (I.P.); (R.S.); (T.Z.)
| | - Tiziana Zotti
- Dipartimento di Scienze e Tecnologie, Università degli Studi del Sannio, Via Port’Arsa 11, 82100 Benevento, Italy; (M.C.); (I.P.); (R.S.); (T.Z.)
- Genus Biotech, Università degli Studi del Sannio, Via Appia snc, 82030 Apollosa (BN), Italy; (S.V.); (L.Z.)
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Telesio G, Scudiero I, Pizzulo M, Mazzone P, Zotti T, Voccola S, Polvere I, Vito P, Stilo R. The E3 Ubiquitin Ligase RNF7 Negatively Regulates CARD14/ CARMA2sh Signaling. Int J Mol Sci 2017; 18:E2581. [PMID: 29194363 DOI: 10.3390/ijms18122581] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 11/21/2017] [Accepted: 11/27/2017] [Indexed: 12/13/2022] Open
Abstract
The three CARD-containing MAGUK (CARMA) proteins function as scaffolding molecules that regulate activation of the pro-inflammatory transcription factor NF-κB. Recently, mutations in CARMA2 have been linked to psoriasis susceptibility due to their acquired altered capacity to activate NF-κB. By means of two-hybrid screening with yeast, we identified RING finger protein 7 (RNF7) as an interactor of CARMA2. We present evidence that RNF7 functions as a negative regulator of the NF-κB-activating capacity of CARMA2. Mechanistically, RNF7 influences CARMA2 signaling by regulating the ubiquitination state of MALT1 and the NF-κB-regulatory molecule NEMO. Interestingly, CARMA2short (CARMA2sh) mutants associated with psoriasis susceptibility escape the negative control exerted by RNF7. In conclusion, our findings identify a new mechanism through which the ability of CARMA2 to activate NF-κB is regulated, which could have significant implications for our understanding of why mutations of this protein trigger human psoriasis.
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