Research article summary (published 10 Oct 2009):

Eukaryotic GCP1 is a conserved mitochondrial protein required for progression of embryo development beyond the globular stage in Arabidopsis thaliana.

Full Abstract

GCPs (glycoproteases) are members of the HSP70 (heat-shock protein 70)/actin ATPase superfamily that are highly conserved in taxonomically diverse species from bacteria to man, suggesting an essential physiological role. Although originally identified and annotated as putative endopeptidases, a proteolytic activity could not be confirmed for these proteins. Our survey of genome databases revealed that all eukaryotic organisms contain two GCP genes [called GCP1 and GCP2/Kae1 (kinase-associated endopeptidase 1)], whereas prokaryotes have only one, either of the GCP1- (Bacteria) or the GCP2/Kae1- (Archaea) type. GCP2/Kae1 is essential for telomere elongation and transcription of essential genes, although little is known about the localization, expression and physiological role of GCP1. In the present study on GCP1-type proteins from eukaryotic organisms we demonstrated that GCP1 is a mitochondrial protein in Homo sapiens [called here GCP1/OSGEPL1 (O-sialoglycoprotein endopeptidase)] and Arabidopsis thaliana, which is located/anchored to the mitochondrial inner membrane. Analysis of mRNA and protein levels revealed that the expression of GCP1/OSGEPL1 in A. thaliana and H. sapiens is tissue- and organ-specific and depends on the developmental stage, suggesting a more specialized function for this protein. We showed that homozygous A. thaliana GCP1 T-DNA (transferred DNA) insertion lines were embryonic lethal. Embryos in homozygous seeds were arrested at the globular stage and failed to undergo the transition into the heart stage. On the basis of these data we propose that the mitochondrial GCP1 is essential for embryonic development in plants.

Author information

Author/s: Haussuehl, Kirsten (K); Huesgen, Pitter F (PF); Meier, Marc (M); Dessi, Patrick (P); Glaser, Elzbieta (E); Adamski, Jerzy (J); Adamska, Iwona (I);

Affiliation: Qiagen GmbH, Qiagen Strasse 1, DE-40724 Hilden, Germany.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: The Biochemical journal (Biochem J), published in England. (Language: eng)

Reference: 2009-Nov; vol 423 (issue 3) : pp 333-41

Dates: Created 2009/10/07; Completed 2009/11/03;

PMID: 19694617, status: MEDLINE (last retrieval date: 11/3/2009, IMS Date: )

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Animals Arabidopsis - embryology; enzymology; genetics Arabidopsis Proteins - biosynthesis; genetics; metabolism Base Sequence Gene Expression Regulation, Developmental - physiology Gene Expression Regulation, Enzymologic - physiology Gene Expression Regulation, Plant - physiology Hela Cells Humans

Male Metalloendopeptidases - biosynthesis; genetics Microtubule-Associated Proteins - biosynthesis; genetics; metabolism Mitochondrial Proteins - biosynthesis; genetics Molecular Sequence Data Organ Specificity - physiology Rabbits Seedling - embryology; enzymology Species Specificity

Associated Chemicals: Arabidopsis Proteins (0) ; GCP1 protein, Arabidopsis (0) ; GCP2 protein, Arabidopsis (0) ; Microtubule-Associated Proteins (0) ; Mitochondrial Proteins (0) ; Metalloendopeptidases (EC 3.4.24.-) ; O-sialoglycoprotein endopeptidase (EC 3.4.24.57)

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