1y01
From Proteopedia
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| - | [[Image:1y01.gif|left|200px]] | + | [[Image:1y01.gif|left|200px]] |
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| - | '''Crystal structure of AHSP bound to Fe(II) alpha-hemoglobin''' | + | {{Structure |
| + | |PDB= 1y01 |SIZE=350|CAPTION= <scene name='initialview01'>1y01</scene>, resolution 2.8Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=OXY:OXYGEN+MOLECULE'>OXY</scene> and <scene name='pdbligand=CHK:6-[(CYCLOHEXYLACETYL)(2-HYDROXYETHYL)AMINO]-6-DEOXY-D-XYLO-HEXITOL'>CHK</scene> | ||
| + | |ACTIVITY= | ||
| + | |GENE= AHSP, EDRF, ERAF ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]), HBA1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens]) | ||
| + | }} | ||
| + | |||
| + | '''Crystal structure of AHSP bound to Fe(II) alpha-hemoglobin''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1Y01 is a [ | + | 1Y01 is a [[Protein complex]] structure of sequences from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1Y01 OCA]. |
==Reference== | ==Reference== | ||
| - | Molecular mechanism of AHSP-mediated stabilization of alpha-hemoglobin., Feng L, Gell DA, Zhou S, Gu L, Kong Y, Li J, Hu M, Yan N, Lee C, Rich AM, Armstrong RS, Lay PA, Gow AJ, Weiss MJ, Mackay JP, Shi Y, Cell. 2004 Nov 24;119(5):629-40. PMID:[http:// | + | Molecular mechanism of AHSP-mediated stabilization of alpha-hemoglobin., Feng L, Gell DA, Zhou S, Gu L, Kong Y, Li J, Hu M, Yan N, Lee C, Rich AM, Armstrong RS, Lay PA, Gow AJ, Weiss MJ, Mackay JP, Shi Y, Cell. 2004 Nov 24;119(5):629-40. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15550245 15550245] |
[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Protein complex]] | [[Category: Protein complex]] | ||
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[[Category: stabilization of alpha hemoglobin]] | [[Category: stabilization of alpha hemoglobin]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 15:16:43 2008'' |
Revision as of 13:16, 20 March 2008
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| , resolution 2.8Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | , and | ||||||
| Gene: | AHSP, EDRF, ERAF (Homo sapiens), HBA1 (Homo sapiens) | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
Crystal structure of AHSP bound to Fe(II) alpha-hemoglobin
Contents |
Overview
Hemoglobin A (HbA), the oxygen delivery system in humans, comprises two alpha and two beta subunits. Free alpha-hemoglobin (alphaHb) is unstable, and its precipitation contributes to the pathophysiology of beta thalassemia. In erythrocytes, the alpha-hemoglobin stabilizing protein (AHSP) binds alphaHb and inhibits its precipitation. The crystal structure of AHSP bound to Fe(II)-alphaHb reveals that AHSP specifically recognizes the G and H helices of alphaHb through a hydrophobic interface that largely recapitulates the alpha1-beta1 interface of hemoglobin. The AHSP-alphaHb interactions are extensive but suboptimal, explaining why beta-hemoglobin can competitively displace AHSP to form HbA. Remarkably, the Fe(II)-heme group in AHSP bound alphaHb is coordinated by the distal but not the proximal histidine. Importantly, binding to AHSP facilitates the conversion of oxy-alphaHb to a deoxygenated, oxidized [Fe(III)], nonreactive form in which all six coordinate positions are occupied. These observations reveal the molecular mechanisms by which AHSP stabilizes free alphaHb.
Disease
Known diseases associated with this structure: Erythremias, alpha- OMIM:[141800], Erythrocytosis OMIM:[141850], Heinz body anemia OMIM:[141850], Heinz body anemias, alpha- OMIM:[141800], Hemoglobin H disease OMIM:[141850], Hypochromic microcytic anemia OMIM:[141850], Methemoglobinemias, alpha- OMIM:[141800], Thalassemia, alpha- OMIM:[141850], Thalassemias, alpha- OMIM:[141800]
About this Structure
1Y01 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Molecular mechanism of AHSP-mediated stabilization of alpha-hemoglobin., Feng L, Gell DA, Zhou S, Gu L, Kong Y, Li J, Hu M, Yan N, Lee C, Rich AM, Armstrong RS, Lay PA, Gow AJ, Weiss MJ, Mackay JP, Shi Y, Cell. 2004 Nov 24;119(5):629-40. PMID:15550245
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