Human islet amyloid polypeptide fibril binding to catalase: a transmission electron microscopy and microplate study

Milton, N.G.N. and Harris, J.R. 2010. Human islet amyloid polypeptide fibril binding to catalase: a transmission electron microscopy and microplate study. ScientificWorldJournal. 10, pp. 879-893.

TitleHuman islet amyloid polypeptide fibril binding to catalase: a transmission electron microscopy and microplate study
AuthorsMilton, N.G.N. and Harris, J.R.
Abstract

The diabetes-associated human islet amyloid polypeptide (IAPP) is a 37-amino-acid peptide that forms fibrils in vitro and in vivo. Human IAPP fibrils are toxic in a similar manner to Alzheimer’s amyloid-beta (A-beta) and prion protein (PrP) fibrils. Previous studies have shown that catalase binds to A-beta fibrils and appears to recognize a region containing the Gly-Ala-Ile-Ile sequence that is similar to the Gly-Ala-Ile-Leu sequence found in human IAPP residues 24-27. This study presents a transmission electron microscopy (TEM)–based analysis of fibril formation and the binding of human erythrocyte catalase to IAPP fibrils. The results show that human IAPP 1-37, 8-37, and 20-29 peptides form fibrils with diverse and polymorphic structures. All three forms of IAPP bound catalase, and complexes of IAPP 1-37 or 8-37 with catalase were identified by immunoassay. The binding of biotinylated IAPP to catalase was high affinity with a KD of 0.77 nM, and could be inhibited by either human or rat IAPP 1-37 and 8-37 forms. Fibrils formed by the PrP 118-135 peptide with a Gly-Ala-Val-Val sequence also bound catalase. These results suggest that catalase recognizes a Gly-Ala-Ile-Leu–like sequence in amyloid fibril-forming peptides. For IAPP 1-37 and 8-37, the catalase binding was primarily directed towards fibrillar rather than ribbon-like structures, suggesting differences in the accessibility of the human IAPP 24-27 Gly-Ala-Ile-Leu region. This suggests that catalase may be able to discriminate between different structural forms of IAPP fibrils. The ability of catalase to bind IAPP, A-beta, and PrP fibrils demonstrates the presence of similar accessible structural motifs that may be targets for antiamyloid therapeutic development.

JournalScientificWorldJournal
Journal citation10, pp. 879-893
ISSN1537-744X
YearMay 2010
PublisherScientificWorld Ltd.
Digital Object Identifier (DOI)doi:10.1100/tsw.2010.73
Publication dates
PublishedMay 2010

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