An ATM homologue from Arabidopsis thaliana: complete genomic organisation and expression analysis.
ATM is a gene mutated in the human disease ataxia telangiectasia with reported homologues in yeast, Drosophila, Xenopus and mouse. Whenever mutants are available they all indicate a role of this gene family in the cellular response to DNA damage. Here, we present the identification and molecular characterisation of the first plant homologue of ATM. The genomic locus of AtATM ( Arabidopsis thaliana homologue of ATM ) spans over 30 kb and is transcribed into a 12 kb mRNA resulting from the splicing of 79 exons. It is a single copy gene and maps to the long arm of chromosome 3. Transcription of AtATM is ubiquitous and not induced by ionising radiation. The putative protein encoded by AtATM is 3856 amino acids long and contains a phosphatidyl inositol-3 kinase-like (Pi3k-l) domain and a rad3 domain, features shared by other members of the ATM family. The AtAtm protein is highly similar to Atm, with 67 and 45% similarity in the Pi3k-l and rad3 domains respectively. Interestingly, the N-terminal portion of the protein harbours a PWWP domain, which is also present in other proteins involved in DNA metabolism such as human mismatch repair enzyme Msh6 and the mammalian de novo methyl transferases, Dnmt3a/b.
Garcia
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V
CEA/Cadarache, DSV, DEVM, Laboratoire de Radiobiologie Végétale, 13108 St Paul-lez-Durance Cedex, France.
Salanoubat
M
M
Choisne
N
N
Tissier
A
A
D000595:Amino Acid Sequence; D000818:Animals; D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins; D064007:Ataxia Telangiectasia Mutated Proteins; D001483:Base Sequence; D002478:Cells, Cultured; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D017931:DNA Primers; D018745:Genome, Plant; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics*; D012333:RNA, Messenger / Q000737:chemistry / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid
C576589:ATM protein, Arabidopsis; D029681:Arabidopsis Proteins; D017931:DNA Primers; D010940:Plant Proteins; D012333:RNA, Messenger; D064007:Ataxia Telangiectasia Mutated Proteins