NMR-based homology model for the solution structure of the C-terminal globular domain of EMILIN1 |
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Authors: | Giuliana Verdone Alessandra Corazza Simon A. Colebrooke Daniel Cicero Tommaso Eliseo Jonathan Boyd Roberto Doliana Federico Fogolari Paolo Viglino Alfonso Colombatti Iain D. Campbell Gennaro Esposito |
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Affiliation: | 1. Dipartimento di Scienze e Tecnologie Biomediche – MATI Centre of Excellence, Università di Udine, P. le Kolbe, 4-33100, Udine, Italy 2. Istituto Biochimico Italiano ‘G. Lorenzini’, 04011, Aprilia, LT, Italy 3. INBB, Viale Medaglie d’Oro, 305, Rome, Italy 4. Department of Biochemistry, University of Oxford, Oxford, UK 5. Dipartimento di Chimica, Università di Tor Vergata, Rome, Italy 6. Divisione di Oncologia Sperimentale 2, Centro di Riferimento Oncologico di Aviano, Aviano, PN, Italy
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Abstract: | EMILIN1 is a glycoprotein of elastic tissues that has been recently linked to the pathogenesis of hypertension. The protein is formed by different independently folded structural domains whose role has been partially elucidated. In this paper the solution structure, inferred from NMR-based homology modelling of the C-terminal trimeric globular C1q domain (gC1q) of EMILIN1, is reported. The high molecular weight and the homotrimeric structure of the protein required the combined use of highly deuterated 15N, 13C-labelled samples and TROSY experiments. Starting from a homology model, the protein structure was refined using heteronuclear residual dipolar couplings, chemical shift patterns, NOEs and H-exchange data. Analysis of the gC1q domain structure of EMILIN1 shows that each protomer of the trimer adopts a nine-stranded β sandwich folding topology which is related to the conformation observed for other proteins of the family. Distinguishing features, however, include a missing edge-strand and an unstructured 19-residue loop. Although the current data do not allow this loop to be precisely defined, the available evidence is consistent with a flexible segment that protrudes from each subunit of the globular trimeric assembly and plays a key role in inter-molecular interactions between the EMILIN1 gC1q homotrimer and its integrin receptor α4β1. Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. |
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Keywords: | Elastic fibres EMILIN1 Globular C1q domain Homotrimeric proteins Large system NMR Partially deuterated proteins |
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