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The pathological Trento variant of alpha-1-antitrypsin (E75V) shows nonclassical behaviour during polymerization

Miranda, E; Ferrarotti, I; Berardelli, R; Laffranchi, M; Cerea, M; Gangemi, F; Haq, I; ... Fra, A; + view all (2017) The pathological Trento variant of alpha-1-antitrypsin (E75V) shows nonclassical behaviour during polymerization. The FEBS Journal , 284 (13) pp. 2110-2126. 10.1111/febs.14111. Green open access

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Abstract

Severe alpha-1-antitrypsin deficiency (AATD) is most frequently associated with the alpha-1-antitrypsin (AAT) Z variant (E342K). ZZ homozygotes exhibit accumulation of AAT as polymers in the endoplasmic reticulum of hepatocytes. This protein deposition can lead to liver disease, with the resulting low circulating levels of AAT predisposing to early-onset emphysema due to dysregulation of elastinolytic activity in the lungs. An increasing number of rare AAT alleles have been identified in patients with severe AATD, typically in combination with the Z allele. Here we report a new mutation (E75V) in a patient with severe plasma deficiency, which we designate Trento. In contrast to the Z mutant, Trento AAT was secreted efficiently when expressed in cellular models but showed compromised conformational stability. Polyacrylamide gel electrophoresis (PAGE) and ELISA-based analyses of the secreted protein revealed the presence of oligomeric species with electrophoretic and immunorecognition profiles different from those of Z and S (E264V) AAT polymers, including reduced recognition by conformational monoclonal antibodies 2C1 and 4B12. This altered recognition was not due to direct effects on the epitope of the 2C1 monoclonal antibody which we localized between helices E and F. Structural analyses indicate the likely basis for polymer formation is the loss of a highly conserved stabilizing interaction between helix C and the posthelix I loop. These results highlight this region as important for maintaining native state stability and, when compromised, results in the formation of pathological polymers that are different from those produced by Z and S AAT.

Type: Article
Title: The pathological Trento variant of alpha-1-antitrypsin (E75V) shows nonclassical behaviour during polymerization
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/febs.14111
Publisher version: http://dx.doi.org/10.1111/febs.14111
Language: English
Additional information: Copyright © 2017 The Authors. The FEBS Journal published by John Wiley & Sons Ltd on behalf of Federation of European Biochemical Societies. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: alpha-1-antitrypsin deficiency, emphysema, misfolding diseases, serpin polymers, serpins
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Medicine > Respiratory Medicine
UCL > Provost and Vice Provost Offices > VP Health
URI: http://discovery.ucl.ac.uk/id/eprint/1556956
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