| Delineating the regions of human transferrin involved in interactions with transferrin binding protein B from Neisseria meningitidis. | |
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MedLine Citation:
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PMID: 20633231 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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Pathogenic bacteria in the Neisseriaceae possess a surface receptor mediating iron acquisition from human transferrin (hTf) that consists of a transmembrane iron transporter (TbpA) and a surface-exposed lipoprotein (TbpB). In this study, we used hydrogen/deuterium exchange coupled to mass spectrometry (H/DX-MS) to elucidate the effects on hTf by interaction with TbpB or derivatives of TbpB. An overall conserved interaction was observed between hTf and full-length or N-lobe TbpB from Neisseria meningitidis strains B16B6 or M982 that represent two distinct subtypes of TbpB. Changes were observed exclusively in the C-lobe of hTf and were caused by the interaction with the N-lobe of TbpB. Regions localized to the 'lip' of the C1 and C2 domains that flank the interdomain cleft represent sites of direct contact with TbpB whereas the peptides within the interdomain cleft that encompass iron binding ligands are inaccessible in the closed (holo) conformation. Although substantial domain separation upon binding TbpB cannot be excluded by the H/DX-MS data, the preferred model of interaction involves binding hTf C-lobe in the closed conformation. Alternate explanations are provided for the substantial protection from deuteration of the peptides encompassing iron binding ligands within the interdomain cleft but cannot be differentiated by the H/DX-MS data. |
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Authors:
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Jessmi M L Ling; Collin H Shima; David C Schriemer; Anthony B Schryvers |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Molecular microbiology Volume: 77 ISSN: 1365-2958 ISO Abbreviation: Mol. Microbiol. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-11-08 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8712028 Medline TA: Mol Microbiol Country: England |
Other Details:
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Languages: eng Pagination: 1301-14 Citation Subset: IM |
Copyright Information:
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© 2010 Blackwell Publishing Ltd. |
Affiliation:
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Department of Microbiology and Infectious Diseases, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta T2N 4N1, Canada. |
Export Citation:
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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MOP 77558//Canadian Institutes of Health Research |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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