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1aj9
From Proteopedia
(New page: 200px<br /> <applet load="1aj9" size="450" color="white" frame="true" align="right" spinBox="true" caption="1aj9, resolution 2.2Å" /> '''R-STATE HUMAN CARBON...) |
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==Overview== | ==Overview== | ||
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 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. | ||
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| + | ==Disease== | ||
| + | Known diseases associated with this structure: Erythremias, alpha- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141800 141800]], Erythremias, beta- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Erythrocytosis OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141850 141850]], HPFH, deletion type OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Heinz body anemia OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141850 141850]], Heinz body anemias, alpha- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141800 141800]], Heinz body anemias, beta- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Hemoglobin H disease OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141850 141850]], Hypochromic microcytic anemia OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141850 141850]], Methemoglobinemias, alpha- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141800 141800]], Methemoglobinemias, beta- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Sickle cell anemia OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Thalassemia, alpha- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141850 141850]], Thalassemia-beta, dominant inclusion-body OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]], Thalassemias, alpha- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141800 141800]], Thalassemias, beta- OMIM:[[http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=141900 141900]] | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: oxygen transport]] | [[Category: oxygen transport]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 12 15:59:08 2007'' |
Revision as of 13:52, 12 November 2007
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R-STATE HUMAN CARBONMONOXYHEMOGLOBIN ALPHA-A53S
Contents |
Overview
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.
Disease
Known diseases associated with this structure: Erythremias, alpha- OMIM:[141800], Erythremias, beta- OMIM:[141900], Erythrocytosis OMIM:[141850], HPFH, deletion type OMIM:[141900], Heinz body anemia OMIM:[141850], Heinz body anemias, alpha- OMIM:[141800], Heinz body anemias, beta- OMIM:[141900], Hemoglobin H disease OMIM:[141850], Hypochromic microcytic anemia OMIM:[141850], Methemoglobinemias, alpha- OMIM:[141800], Methemoglobinemias, beta- OMIM:[141900], Sickle cell anemia OMIM:[141900], Thalassemia, alpha- OMIM:[141850], Thalassemia-beta, dominant inclusion-body OMIM:[141900], Thalassemias, alpha- OMIM:[141800], Thalassemias, beta- OMIM:[141900]
About this Structure
1AJ9 is a Protein complex structure of sequences from Homo sapiens with PO4, HEM and CMO as ligands. 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
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