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Sequence analyses reveal that a TPR–DP module, surrounded by recombinable flanking introns, could be at the origin of eukaryotic Hop and Hip TPR–DP domains and prokaryotic GerD proteins

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Cell Stress and Chaperones Aims and scope

Abstract

The co-chaperone Hop [heat shock protein (HSP) organising protein] is known to bind both Hsp70 and Hsp90. Hop comprises three repeats of a tetratricopeptide repeat (TPR) domain, each consisting of three TPR motifs. The first and last TPR domains are followed by a domain containing several dipeptide (DP) repeats called the DP domain. These analyses suggest that the hop genes result from successive recombination events of an ancestral TPR–DP module. From a hydrophobic cluster analysis of homologous Hop protein sequences derived from gene families, we can postulate that shifts in the open reading frames are at the origin of the present sequences. Moreover, these shifts can be related to the presence or absence of biological function. We propose to extend the family of Hop co-chaperons into the kingdom of bacteria, as several structurally related genes have been identified by hydrophobic cluster analysis. We also provide evidence of common structural characteristics between hop and hip genes, suggesting a shared precursor of ancestral TPR–DP domains.

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Abbreviations

aa:

amino acid

HCA:

hydrophobic cluster analysis

Hip:

Hsp70 interacting protein

Hop:

HSP organizing protein

HSPs:

heat shock proteins

TPR:

tetratricopeptide repeat

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Acknowledgments

Many thanks are due to Kirsty MacLellan for careful reading of this manuscript. This work has benefited of a grant from ECOS-Nord French and Colombian program (A0502). J.H.T. has been invited as research fellow by CNRS. RPBS bioinformatics resources have been used for this project (http://bioserv.rpbs.univ-paris-diderot.fr/). We also aknowledge the Vicerrectoría de Investigaciones y Extensión of the Universidad Industrial de Santander, by its financial aid. Part of this work is an application of the Protein Folding Fragments project, supported by European Union, under the grant number QLG2-CT-2002-01298.

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Correspondence to Jorge Hernández Torres.

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Supplementary material

Multiple alignment of TPR–DP domains (top and bottom boxes, respectively) for H. sapiens (Hs), G. max (Gm) and T. cruzi (Tc). To help to recover, the names are as follows: Hs_TPR1 and Hs_DP1 (Hs_TPR2B and Hs_DP2) are TPR1 (TPR2B) from Fig. 3. Gm_DP1 is GMSTI-rf1 and Tc_DP2 is TcHop2-rf1 from Fig. 1. Identical nonhydrophobic residues are colored in blue, and hydrophobic residues identical in at least five sequences (four in the case of DP domains) are colored in green. Stars under the alignment indicate positions only occupied by hydrophobic amino acids. Prolines involved in DP dipeptides are red, and they are also in italic when they are mutated in G. max. In black, the residues mutated by frameshifts (GIF 222 kb)

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Hernández Torres, J., Papandreou, N. & Chomilier, J. Sequence analyses reveal that a TPR–DP module, surrounded by recombinable flanking introns, could be at the origin of eukaryotic Hop and Hip TPR–DP domains and prokaryotic GerD proteins. Cell Stress and Chaperones 14, 281–289 (2009). https://doi.org/10.1007/s12192-008-0083-8

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