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Protein-protein interactions of the hyperthermophilic archaeon Pyrococcus horikoshii OT3.

Abstract：

BACKGROUND:Although 2,061 proteins of Pyrococcus horikoshii OT3, a hyperthermophilic archaeon, have been predicted from the recently completed genome sequence, the majority of proteins show no similarity to those from other organisms and are thus hypothetical proteins of unknown function. Because most proteins operate as parts of complexes to regulate biological processes, we systematically analyzed protein-protein interactions in Pyrococcus using the mammalian two-hybrid system to determine the function of the hypothetical proteins. RESULTS:We examined 960 soluble proteins from Pyrococcus and selected 107 interactions based on luciferase reporter activity, which was then evaluated using a computational approach to assess the reliability of the interactions. We also analyzed the expression of the assay samples by western blot, and a few interactions by in vitro pull-down assays. We identified 11 hetero-interactions that we considered to be located at the same operon, as observed in Helicobacter pylori. We annotated and classified proteins in the selected interactions according to their orthologous proteins. Many enzyme proteins showed self-interactions, similar to those seen in other organisms. CONCLUSION:We found 13 unannotated proteins that interacted with annotated proteins; this information is useful for predicting the functions of the hypothetical Pyrococcus proteins from the annotations of their interacting partners. Among the heterogeneous interactions, proteins were more likely to interact with proteins within the same ortholog class than with proteins of different classes. The analysis described here can provide global insights into the biological features of the protein-protein interactions in P. horikoshii.

journal_name

Genome Biol

journal_title

Genome biology

authors

Usui K,Katayama S,Kanamori-Katayama M,Ogawa C,Kai C,Okada M,Kawai J,Arakawa T,Carninci P,Itoh M,Takio K,Miyano M,Kidoaki S,Matsuda T,Hayashizaki Y,Suzuki H

doi

10.1186/gb-2005-6-12-r98

keywords:

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

R98

issue

12

eissn

1474-7596

issn

1474-760X

pii

gb-2005-6-12-r98

journal_volume

6

pub_type

杂志文章

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