2gov
From Proteopedia
(New page: 200px<br /><applet load="2gov" size="450" color="white" frame="true" align="right" spinBox="true" caption="2gov" /> '''Solution structure of Murine p22HBP'''<br />...) |
|||
| Line 1: | Line 1: | ||
| - | [[Image:2gov.gif|left|200px]]<br /><applet load="2gov" size=" | + | [[Image:2gov.gif|left|200px]]<br /><applet load="2gov" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2gov" /> | caption="2gov" /> | ||
'''Solution structure of Murine p22HBP'''<br /> | '''Solution structure of Murine p22HBP'''<br /> | ||
==Overview== | ==Overview== | ||
| - | Murine p22HBP, a 22-kDa monomer originally identified as a cytosolic | + | Murine p22HBP, a 22-kDa monomer originally identified as a cytosolic heme-binding protein ubiquitously expressed in various tissues, has 27% sequence identity to murine SOUL, a heme-binding hexamer specifically expressed in the retina. In contrast to murine SOUL, which binds one heme per subunit via coordination of the Fe(III)-heme to a histidine, murine p22HBP binds one heme molecule per subunit with no specific axial ligand coordination of the Fe(III)-heme. Using intrinsic protein fluorescence quenching, the values for the dissociation constants of p22HBP for hemin and protoporphyrin-IX were determined to be in the low nanomolar range. The three-dimensional structure of murine p22HBP, the first for a protein from the SOUL/HBP family, was determined by NMR methods to consist of a 9-stranded distorted beta-barrel flanked by two long alpha-helices. Although homologous domains have been found in three bacterial proteins, two of which are transcription factors, the fold determined for p22HBP corresponds to a novel alpha plus beta fold in a eukaryotic protein. Chemical shift mapping localized the tetrapyrrole binding site to a hydrophobic cleft formed by residues from helix alphaA and an extended loop. In an attempt to assess the structural basis for tetrapyrrole binding in the SOUL/HBP family, models for the p22HBP-protoporphyrin-IX complex and the SOUL protein were generated by manual docking and automated methods. |
==About this Structure== | ==About this Structure== | ||
| - | 2GOV is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http:// | + | 2GOV is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GOV OCA]. |
==Reference== | ==Reference== | ||
| Line 13: | Line 13: | ||
[[Category: Mus musculus]] | [[Category: Mus musculus]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
| - | [[Category: CESG, Center | + | [[Category: CESG, Center for Eukaryotic Structural Genomics.]] |
| - | [[Category: Dias, J | + | [[Category: Dias, J S.]] |
| - | [[Category: Goodfellow, B | + | [[Category: Goodfellow, B J.]] |
| - | [[Category: Peterson, F | + | [[Category: Peterson, F C.]] |
| - | [[Category: Volkman, B | + | [[Category: Volkman, B F.]] |
[[Category: center for eukaryotic structural genomics]] | [[Category: center for eukaryotic structural genomics]] | ||
[[Category: cesg]] | [[Category: cesg]] | ||
| Line 26: | Line 26: | ||
[[Category: structural genomics]] | [[Category: structural genomics]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 17:33:48 2008'' |
Revision as of 15:33, 21 February 2008
|
Solution structure of Murine p22HBP
Overview
Murine p22HBP, a 22-kDa monomer originally identified as a cytosolic heme-binding protein ubiquitously expressed in various tissues, has 27% sequence identity to murine SOUL, a heme-binding hexamer specifically expressed in the retina. In contrast to murine SOUL, which binds one heme per subunit via coordination of the Fe(III)-heme to a histidine, murine p22HBP binds one heme molecule per subunit with no specific axial ligand coordination of the Fe(III)-heme. Using intrinsic protein fluorescence quenching, the values for the dissociation constants of p22HBP for hemin and protoporphyrin-IX were determined to be in the low nanomolar range. The three-dimensional structure of murine p22HBP, the first for a protein from the SOUL/HBP family, was determined by NMR methods to consist of a 9-stranded distorted beta-barrel flanked by two long alpha-helices. Although homologous domains have been found in three bacterial proteins, two of which are transcription factors, the fold determined for p22HBP corresponds to a novel alpha plus beta fold in a eukaryotic protein. Chemical shift mapping localized the tetrapyrrole binding site to a hydrophobic cleft formed by residues from helix alphaA and an extended loop. In an attempt to assess the structural basis for tetrapyrrole binding in the SOUL/HBP family, models for the p22HBP-protoporphyrin-IX complex and the SOUL protein were generated by manual docking and automated methods.
About this Structure
2GOV is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.
Reference
The first structure from the SOUL/HBP family of heme-binding proteins, murine P22HBP., Dias JS, Macedo AL, Ferreira GC, Peterson FC, Volkman BF, Goodfellow BJ, J Biol Chem. 2006 Oct 20;281(42):31553-61. Epub 2006 Aug 10. PMID:16905545
Page seeded by OCA on Thu Feb 21 17:33:48 2008
