{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,11]],"date-time":"2025-11-11T13:02:07Z","timestamp":1762866127218},"reference-count":46,"publisher":"Portland Press Ltd.","issue":"2","content-domain":{"domain":["portlandpress.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2013,4,15]]},"abstract":"<jats:p>Non-catalytic cellulosomal CBMs (carbohydrate-binding modules) are responsible for increasing the catalytic efficiency of cellulosic enzymes by selectively putting the substrate (a wide range of poly- and oligo-saccharides) and enzyme into close contact. In the present study we carried out an atomistic rationalization of the molecular determinants of ligand specificity for a family 11 CBM from thermophilic Clostridium thermocellum [CtCBM11 (C. thermocellum CBM11)], based on a NMR and molecular modelling approach. We have determined the NMR solution structure of CtCBM11 at 25\u00b0C and 50\u00b0C and derived information on the residues of the protein that are involved in ligand recognition and on the influence of the length of the saccharide chain on binding. We obtained models of the CtCBM11\u2013cellohexaose and CtCBM11\u2013cellotetraose complexes by docking in accordance with the NMR experimental data. Specific ligand\u2013protein CH-\u03c0 and Van der Waals interactions were found to be determinant for the stability of the complexes and for defining specificity. Using the order parameters derived from backbone dynamics analysis in the presence and absence of ligand and at 25\u00b0C and 50\u00b0C, we determined that the protein's backbone conformational entropy is slightly positive. This data in combination with the negative binding entropy calculated from ITC (isothermal titration calorimetry) studies supports a selection mechanism where a rigid protein selects a defined oligosaccharide conformation.<\/jats:p>","DOI":"10.1042\/bj20120627","type":"journal-article","created":{"date-parts":[[2013,1,29]],"date-time":"2013-01-29T13:56:13Z","timestamp":1359467773000},"page":"289-300","update-policy":"http:\/\/dx.doi.org\/10.1042\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Solution structure, dynamics and binding studies of a family 11 carbohydrate-binding module from <i>Clostridium thermocellum<\/i> (<i>Ct<\/i>CBM11)"],"prefix":"10.1042","volume":"451","author":[{"given":"Aldino","family":"Viegas","sequence":"first","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Jo\u00e3o","family":"Sardinha","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Filipe","family":"Freire","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Daniel\u00a0F.","family":"Duarte","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Ana\u00a0L.","family":"Carvalho","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Carlos\u00a0M. G. A.","family":"Fontes","sequence":"additional","affiliation":[{"name":"Centro Interdisciplinar de Investiga\u00e7\u00e3o em Sanidade Animal, Fac. Med. Veterin\u00e1ria, Universidade T\u00e9cnica de Lisboa, 1300-477 Lisboa, Portugal"}]},{"given":"Maria\u00a0J.","family":"Rom\u00e3o","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Anjos\u00a0L.","family":"Macedo","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]},{"given":"Eurico\u00a0J.","family":"Cabrita","sequence":"additional","affiliation":[{"name":"REQUIMTE-CQFB, Dep. de Qu\u00edmica, Faculdade de Ci\u00eancias e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal"}]}],"member":"288","published-online":{"date-parts":[[2013,3,28]]},"reference":[{"key":"2021112217335514000_B1","doi-asserted-by":"crossref","first-page":"2954","DOI":"10.1007\/s00018-006-6195-3","article-title":"Recent structural studies of carbohydrate-binding modules","volume":"63","author":"Hashimoto","year":"2006","journal-title":"Cell. 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