THE ATHB-1 AND ATHB-2 HD-ZIP DOMAINS HOMODIMERIZE FORMING COMPLEXES OF DIFFERENT DNA-BINDING SPECIFICITIES (Articolo in rivista)

Type
Label
  • THE ATHB-1 AND ATHB-2 HD-ZIP DOMAINS HOMODIMERIZE FORMING COMPLEXES OF DIFFERENT DNA-BINDING SPECIFICITIES (Articolo in rivista) (literal)
Anno
  • 1993-01-01T00:00:00+01:00 (literal)
Alternative label
  • G Sessa (1); G Morelli (2); I Ruberti (1) (1993)
    THE ATHB-1 AND ATHB-2 HD-ZIP DOMAINS HOMODIMERIZE FORMING COMPLEXES OF DIFFERENT DNA-BINDING SPECIFICITIES
    in EMBO journal (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • G Sessa (1); G Morelli (2); I Ruberti (1) (literal)
Pagina inizio
  • 3507 (literal)
Pagina fine
  • 3517 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 12 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 9 (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • (1) Istituto di Biologia e Patologia Molecolari (2) Istituto di Ricerca per gli Alimenti e la Nutrizione (literal)
Titolo
  • THE ATHB-1 AND ATHB-2 HD-ZIP DOMAINS HOMODIMERIZE FORMING COMPLEXES OF DIFFERENT DNA-BINDING SPECIFICITIES (literal)
Abstract
  • The Arabidopsis Athb-1 and -2 proteins are characterized by the presence of a homeodomain (HD) with a closely linked leucine zipper motif (Zip). We have suggested that the HD-Zip motif could, via dimerization of the leucine zippers, recognize dyad-symmetric DNA sequences. Here we report an analysis of the DNA binding properties of the Athb-1 homeodomain-leucine zipper (HD-Zip-1) domain in vitro. DNA binding analysis performed using random-sequence DNA templates showed that the HD-Zip-1 domain, but not the Athb-I HD alone, binds to DNA. The HD-Zip-1 domain recognizes a 9 bp dyad-symmetric sequence [CAAT(A/T)ATTG], as determined by selecting high-affinity binding sites from random-sequence DNA. Gel retardation assays demonstrated that the HD-Zip-1 domain binds to DNA as a dimer. Moreover, the analysis of the DNA binding activity of Athb-1 derivatives indicated that a correct spatial relationship between the HD and the Zip is essential for DNA binding. Finally, we determined that the Athb-2 HD-Zip domain recognizes a distinct 9 bp dyad-symmetric sequence [CAAT(G/C)ATTG]. A model of DNA binding by the HD-Zip proteins is proposed (literal)
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