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| {{STRUCTURE_2cmm| PDB=2cmm | SCENE= }} | | {{STRUCTURE_2cmm| PDB=2cmm | SCENE= }} |
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| '''STRUCTURAL ANALYSIS OF THE MYOGLOBIN RECONSTITUTED WITH IRON PORPHINE'''
| | ===STRUCTURAL ANALYSIS OF THE MYOGLOBIN RECONSTITUTED WITH IRON PORPHINE=== |
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| ==Overview==
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| Sperm whale apomyoglobin was complexed with iron porphine to examine the influence of completely removed heme side chains on the entire molecular structure. Paramagnetic NMR peak from the proximal histidine of the deoxy protein ensured formation of the iron-histidine bond. Porphine pyrrole-proton NMR signals of the cyanmet and deoxy derivatives are unusually sharp single lines manifesting rapid heme rotation about the iron-histidine bond. X-ray crystallographic structure of the cyanmet derivative, determined with a final R factor of 0.21 for 11,808 independent reflections ranging from 7 to 1.8 A, was resolved at 1.8 A resolution. The result confirmed 1:1 coupling between apomyoglobin and iron porphine. The cyano ligand adopts a bent configuration with an Fe-C-N angle of 127 degrees and a Fe-CN distance of 1.89 A. The overall globin structure and side chain conformations are remarkably similar to those of native myoglobin despite intensive disruption of the original heme-globin interactions. The native apoprotein structure unexpectedly conserved even after iron porphine insertion demonstrates that the complex polypeptide fold of holomyoglobin is more inherent in the amino acid sequence than is generally believed.
| | The line below this paragraph, {{ABSTRACT_PUBMED_8473336}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 8473336 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_8473336}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Tanaka, N.]] | | [[Category: Tanaka, N.]] |
| [[Category: Oxygen transport]] | | [[Category: Oxygen transport]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 22:31:10 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 12:50:19 2008'' |
