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| - | [[Image:1aj9.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1aj9| PDB=1aj9 | SCENE= }} | | {{STRUCTURE_1aj9| PDB=1aj9 | SCENE= }} |
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| - | '''R-STATE HUMAN CARBONMONOXYHEMOGLOBIN ALPHA-A53S'''
| + | ===R-STATE HUMAN CARBONMONOXYHEMOGLOBIN ALPHA-A53S=== |
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| - | ==Overview==
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| - | The three-dimensional structure and associated solvent of human carboxyhemoglobin at 2.2 A resolution are compared with other R-state and T-state human hemoglobin structures. The crystal form is isomorphous with that of the 2.7 A structure of carboxyhemoglobin reported earlier [Baldwin (1980). J. Mol. Biol. 136, 103-128], whose coordinates were used as a starting model, and with the 2.2 A structure described in an earlier report [Derewenda et al. (1990). J. Mol. Biol. 211, 515-519]. During the course of the refinement, a natural mutation of the alpha-subunit, A53S, was discovered that forms a new crystal contact through a bridging water molecule. The protein structure shows a significant difference between the alpha and beta heme geometries, with Fe-C-O angles of 125 and 162 degrees, respectively. The carboxyhemoglobin is compared with other fully ligated R-state human hemoglobins [Baldwin (1980). J. Mol. Biol. 136, 103-128; Shaanan (1983). J. Mol. Biol. 195, 419-422] with the R2-state hemoglobin [Silva et al. (1992). J. Biol. Chem. 267, 17248-17256] and with T-state deoxyhemoglobin [Fronticelli et al. (1994). J. Biol. Chem. 269, 23965-23969]. The structure is similar to the earlier reported R-state structures, but there are differences in many side-chain conformations, the associated water structure and the presence and the position of a phosphate ion. The quaternary changes between the R-state carboxyhemoglobin and the R2-state and T-state structures are in general consistent with those reported in the earlier structures. The location of 238 water molecules and a phosphate ion in the carboxyhemoglobin structure allows the first comparison of the solvent structures of the R-state and T-state structures. Distinctive hydration patterns for each of the quaternary structures are observed, but a number of conserved water molecule binding sites are found that are independent of the conformational state of the protein.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_9761903}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 9761903 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_9761903}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Mutant]] | | [[Category: Mutant]] |
| | [[Category: Oxygen transport]] | | [[Category: Oxygen transport]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 10:20:36 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 16:58:11 2008'' |
Revision as of 13:58, 30 June 2008
Template:STRUCTURE 1aj9
R-STATE HUMAN CARBONMONOXYHEMOGLOBIN ALPHA-A53S
Template:ABSTRACT PUBMED 9761903
About this Structure
1AJ9 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Human carboxyhemoglobin at 2.2 A resolution: structure and solvent comparisons of R-state, R2-state and T-state hemoglobins., Vasquez GB, Ji X, Fronticelli C, Gilliland GL, Acta Crystallogr D Biol Crystallogr. 1998 May 1;54(Pt 3):355-66. PMID:9761903
Page seeded by OCA on Mon Jun 30 16:58:11 2008
