{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77369"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77369","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Fluorescence Depolarization Study of Internal Tryptophan Mobility in Hydrated Azurin Films","abstract":"The effect of hydration on protein dynamics was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of internal degrees of rotational freedom in the protein as a function of film hydration. In the dry film at room temperature the tryptophan fluorescence emission showed the limiting polarization characteristic of low temperature solutions in which all motion is frozen. As the hydration was increased, the observed polarization value changed sharply at about 0.6 h (h = g water/g film), indicating an increase in the rotational mobility of the tryptophan. The fully hydrated film had a polarization equal to that of an azurin solution measurement extrapolated to infinite viscosity where the rotation of the protein as a whole is hindered. The conclusion is that the protein internal mobility is linked to the hydration level, and that hydration can turn on the full protein flexibility on the nanosecond time scale accessible by fluorescence techniques.","abstract_html":"The effect of hydration on protein dynamics was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of internal degrees of rotational freedom in the protein as a function of film hydration. In the dry film at room temperature the tryptophan fluorescence emission showed the limiting polarization characteristic of low temperature solutions in which all motion is frozen. As the hydration was increased, the observed polarization value changed sharply at about 0.6 h (h = g water/g film), indicating an increase in the rotational mobility of the tryptophan. The fully hydrated film had a polarization equal to that of an azurin solution measurement extrapolated to infinite viscosity where the rotation of the protein as a whole is hindered. The conclusion is that the protein internal mobility is linked to the hydration level, and that hydration can turn on the full protein flexibility on the nanosecond time scale accessible by fluorescence techniques.","abstract_has_math":false,"creators":["Limkeman, Mark Kenneth"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-13T15:41:43Z","date_published":"2015-05-13T15:41:43Z","updated_at":"2026-07-22T22:26:10Z","subjects":["Physics, Molecular"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8422117"],"render_values":[{"text":"(UMI)AAI8422117","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77369","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Limkeman, Mark Kenneth"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-13T15:41:43Z","10000-01-01","1984"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Molecular"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77369","(UMI)AAI8422117"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The effect of hydration on protein dynamics was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of internal degrees of rotational freedom in the protein as a function of film hydration. In the dry film at room temperature the tryptophan fluorescence emission showed the limiting polarization characteristic of low temperature solutions in which all motion is frozen. As the hydration was increased, the observed polarization value changed sharply at about 0.6 h (h = g water/g film), indicating an increase in the rotational mobility of the tryptophan. The fully hydrated film had a polarization equal to that of an azurin solution measurement extrapolated to infinite viscosity where the rotation of the protein as a whole is hindered. The conclusion is that the protein internal mobility is linked to the hydration level, and that hydration can turn on the full protein flexibility on the nanosecond time scale accessible by fluorescence techniques.","Made available in DSpace on 2015-05-13T15:41:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8422117.PDF: 2580181 bytes, checksum: 188ae89c9a2362e956ee0f66b8e20038 (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 78580 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","116 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."]},{"key":"dc:title","label":"Title","values":["Fluorescence Depolarization Study of Internal Tryptophan Mobility in Hydrated Azurin Films"]}]}],"canonical_facts":{"dc:creator":["Limkeman, Mark Kenneth"],"dc:date":["2015-05-13T15:41:43Z","10000-01-01","1984"],"dc:description":["The effect of hydration on protein dynamics was investigated using steady state fluorescence depolarization on azurin, which has a single tryptophan residue well-buried in the hydrophobic interior. Azurin was imbedded in a thin, solid, water-permeable polymer film. This procedure inhibited whole-protein motion while allowing examination of internal degrees of rotational freedom in the protein as a function of film hydration. In the dry film at room temperature the tryptophan fluorescence emission showed the limiting polarization characteristic of low temperature solutions in which all motion is frozen. As the hydration was increased, the observed polarization value changed sharply at about 0.6 h (h = g water/g film), indicating an increase in the rotational mobility of the tryptophan. The fully hydrated film had a polarization equal to that of an azurin solution measurement extrapolated to infinite viscosity where the rotation of the protein as a whole is hindered. The conclusion is that the protein internal mobility is linked to the hydration level, and that hydration can turn on the full protein flexibility on the nanosecond time scale accessible by fluorescence techniques.","Made available in DSpace on 2015-05-13T15:41:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8422117.PDF: 2580181 bytes, checksum: 188ae89c9a2362e956ee0f66b8e20038 (MD5) Previous issue date: 1984","Embargo set by: Seth Robbins for item 78580 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","116 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984."],"dc:identifier":["http://hdl.handle.net/2142/77369","(UMI)AAI8422117"],"dc:language":["eng"],"dc:subject":["Physics, Molecular"],"dc:title":["Fluorescence Depolarization Study of Internal Tryptophan Mobility in Hydrated Azurin Films"],"dc:type":["text"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:10Z"}