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Protein & Peptide Letters


ISSN (Print): 0929-8665
ISSN (Online): 1875-5305

The PA207 Peptide Inhibitor of LIM-only Protein 2 (Lmo2) Targets Zinc Finger Domains in a Non-specific Manner

Author(s): Lorna Wilkinson-White and Jacqueline M. Matthews

Volume 21 , Issue 2 , 2014

Page: [132 - 139] Pages: 8

DOI: 10.2174/09298665113206660116

Price: $58


Peptide aptamers of LIM-only protein 2 (Lmo2) were previously used to successfully treat Lmo2-induced tumours in a mouse model of leukaemia. Here we show that the Lmo2 aptamer PA207, either as a free peptide or fused to thioredoxin Trx-PA207, causes purified Lmo2 to precipitate rather than binding to a defined surface on the protein. Stabilisation of Lmo2 through interaction with LIM domain binding protein 1 (Ldb1), a normal binding partner of Lmo2, abrogates this effect. The addition of free zinc causes Trx-PA207 to self associate, suggesting that PA207 destabilises Lmo2 by modulating normal zinc-coordination in the LIM domains. GST-pulldown experiments with other Lmo and Gata proteins indicates that PA207 can bind to a range of zinc finger proteins. Thus, PA207 and other cysteine-containing peptide aptamers for Lmo2 may form a class of general zinc finger inhibitors.

Keywords: Chemical shift perturbation experiments, Lmo2, peptide aptamer, peptide-protein interaction, protein destabilisation, zinc co-ordination.

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