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1zao

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[[Image:1zao.gif|left|200px]]
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{{STRUCTURE_1zao| PDB=1zao | SCENE= }}
{{STRUCTURE_1zao| PDB=1zao | SCENE= }}
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'''Crystal Structure of A.fulgidus Rio2 Kinase Complexed With ATP and Manganese Ions'''
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===Crystal Structure of A.fulgidus Rio2 Kinase Complexed With ATP and Manganese Ions===
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==Overview==
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The highly conserved, atypical RIO serine protein kinases are found in all organisms, from archaea to man. In yeast, the kinase activity of Rio2 is necessary for the final processing step of maturing the 18S ribosomal rRNA. We have previously shown that the Rio2 protein from Archaeoglobus fulgidus contains both a small kinase domain and an N-terminal winged helix domain. Previously solved structures using crystals soaked in nucleotides and Mg2+ or Mn2+ showed bound nucleotide but no ordered metal ions, leading us to the conclusion that they did not represent an active conformation of the enzyme. To determine the functional form of Rio2, we crystallized it after incubation with ATP or ADP and Mn2+. Co-crystal structures of Rio2-ATP-Mn and Rio2-ADP-Mn were solved at 1.84 and 1.75 angstroms resolution, respectively. The gamma-phosphate of ATP is firmly positioned in a manner clearly distinct from its location in canonical serine kinases. Comparison of the Rio2-ATP-Mn complex with the Rio2 structure with no added nucleotides and with the ADP complex indicates that a flexible portion of the Rio2 molecule becomes ordered through direct interaction between His126 and the gamma-phosphate oxygen of ATP. Phosphopeptide mapping of the autophosphorylation site of Rio2 identified Ser128, within the flexible loop and directly adjacent to the part that becomes ordered in response to ATP, as the target. These results give us further information about the nature of the active site of Rio2 kinase and suggest a mechanism of regulation of its enzymatic activity.
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(as it appears on PubMed at http://www.pubmed.gov), where 15943813 is the PubMed ID number.
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{{ABSTRACT_PUBMED_15943813}}
==About this Structure==
==About this Structure==
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[[Category: Serine kinase]]
[[Category: Serine kinase]]
[[Category: Winged-helix]]
[[Category: Winged-helix]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 17:23:40 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:02:49 2008''

Revision as of 01:02, 28 July 2008

Image:1zao.png

Template:STRUCTURE 1zao

Crystal Structure of A.fulgidus Rio2 Kinase Complexed With ATP and Manganese Ions

Template:ABSTRACT PUBMED 15943813

About this Structure

1ZAO is a Single protein structure of sequence from Archaeoglobus fulgidus. Full crystallographic information is available from OCA.

Reference

Autophosphorylation of Archaeoglobus fulgidus Rio2 and crystal structures of its nucleotide-metal ion complexes., LaRonde-LeBlanc N, Guszczynski T, Copeland T, Wlodawer A, FEBS J. 2005 Jun;272(11):2800-10. PMID:15943813

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