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| - | {{STRUCTURE_3edu| PDB=3edu | SCENE= }}
| + | ==Crystal structure of the ankyrin-binding domain of human erythroid spectrin== |
| - | ===Crystal structure of the ankyrin-binding domain of human erythroid spectrin===
| + | <StructureSection load='3edu' size='340' side='right' caption='[[3edu]], [[Resolution|resolution]] 2.10Å' scene=''> |
| - | {{ABSTRACT_PUBMED_19168783}}
| + | == Structural highlights == |
| | + | <table><tr><td colspan='2'>[[3edu]] is a 1 chain structure with sequence 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=3EDU OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3EDU FirstGlance]. <br> |
| | + | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">SPTB, SPTB1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])</td></tr> |
| | + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3edu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3edu OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3edu RCSB], [http://www.ebi.ac.uk/pdbsum/3edu PDBsum]</span></td></tr> |
| | + | </table> |
| | + | == Disease == |
| | + | [[http://www.uniprot.org/uniprot/SPTB1_HUMAN SPTB1_HUMAN]] Defects in SPTB are the cause of elliptocytosis type 3 (EL3) [MIM:[http://omim.org/entry/182870 182870]]. EL3 is a Rhesus-unlinked form of hereditary elliptocytosis, a genetically heterogeneous, autosomal dominant hematologic disorder. It is characterized by variable hemolytic anemia and elliptical or oval red cell shape.<ref>PMID:8226774</ref> <ref>PMID:7883966</ref> <ref>PMID:8018926</ref> <ref>PMID:1975598</ref> Defects in SPTB are the cause of spherocytosis type 2 (SPH2) [MIM:[http://omim.org/entry/182870 182870]]; also known as hereditary spherocytosis type 2 (HS2). Spherocytosis is a hematologic disorder leading to chronic hemolytic anemia and characterized by numerous abnormally shaped erythrocytes which are generally spheroidal. SPH2 is characterized by severe hemolytic anemia. Inheritance is autosomal dominant. |
| | + | == Function == |
| | + | [[http://www.uniprot.org/uniprot/SPTB1_HUMAN SPTB1_HUMAN]] Spectrin is the major constituent of the cytoskeletal network underlying the erythrocyte plasma membrane. It associates with band 4.1 and actin to form the cytoskeletal superstructure of the erythrocyte plasma membrane. |
| | + | == Evolutionary Conservation == |
| | + | [[Image:Consurf_key_small.gif|200px|right]] |
| | + | Check<jmol> |
| | + | <jmolCheckbox> |
| | + | <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ed/3edu_consurf.spt"</scriptWhenChecked> |
| | + | <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked> |
| | + | <text>to colour the structure by Evolutionary Conservation</text> |
| | + | </jmolCheckbox> |
| | + | </jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf]. |
| | + | <div style="clear:both"></div> |
| | + | <div style="background-color:#fffaf0;"> |
| | + | == Publication Abstract from PubMed == |
| | + | Spectrin and ankyrin participate in membrane organization, stability, signal transduction, and protein targeting; their interaction is critical for erythrocyte stability. Repeats 14 and 15 of betaI-spectrin are crucial for ankyrin recognition, yet the way spectrin binds ankyrin while preserving its repeat structure is unknown. We have solved the crystal structure of the betaI-spectrin 14,15 di-repeat unit to 2.1 A resolution and found 14 residues critical for ankyrin binding that map to the end of the helix C of repeat 14, the linker region, and the B-C loop of repeat 15. The tilt (64 degrees) across the 14,15 linker is greater than in any published di-repeat structure, suggesting that the relative positioning of the two repeats is important for ankyrin binding. We propose that a lack of structural constraints on linker and inter-helix loops allows proteins containing spectrin-like di-repeats to evolve diverse but specific ligand-recognition sites without compromising the structure of the repeat unit. The linker regions between repeats are thus critical determinants of both spectrin's flexibility and polyfunctionality. The putative coupling of flexibility and ligand binding suggests a mechanism by which spectrin might participate in mechanosensory regulation. |
| | | | |
| - | ==Disease==
| + | The structure of the ankyrin-binding site of beta-spectrin reveals how tandem spectrin-repeats generate unique ligand-binding properties.,Stabach PR, Simonovic I, Ranieri MA, Aboodi MS, Steitz TA, Simonovic M, Morrow JS Blood. 2009 May 28;113(22):5377-84. Epub 2009 Jan 23. PMID:19168783<ref>PMID:19168783</ref> |
| - | [[http://www.uniprot.org/uniprot/SPTB1_HUMAN SPTB1_HUMAN]] Defects in SPTB are the cause of elliptocytosis type 3 (EL3) [MIM:[http://omim.org/entry/182870 182870]]. EL3 is a Rhesus-unlinked form of hereditary elliptocytosis, a genetically heterogeneous, autosomal dominant hematologic disorder. It is characterized by variable hemolytic anemia and elliptical or oval red cell shape.<ref>PMID:8226774</ref><ref>PMID:7883966</ref><ref>PMID:8018926</ref><ref>PMID:1975598</ref> Defects in SPTB are the cause of spherocytosis type 2 (SPH2) [MIM:[http://omim.org/entry/182870 182870]]; also known as hereditary spherocytosis type 2 (HS2). Spherocytosis is a hematologic disorder leading to chronic hemolytic anemia and characterized by numerous abnormally shaped erythrocytes which are generally spheroidal. SPH2 is characterized by severe hemolytic anemia. Inheritance is autosomal dominant.
| + | |
| | | | |
| - | ==Function==
| + | From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> |
| - | [[http://www.uniprot.org/uniprot/SPTB1_HUMAN SPTB1_HUMAN]] Spectrin is the major constituent of the cytoskeletal network underlying the erythrocyte plasma membrane. It associates with band 4.1 and actin to form the cytoskeletal superstructure of the erythrocyte plasma membrane.
| + | </div> |
| - | | + | |
| - | ==About this Structure==
| + | |
| - | [[3edu]] is a 1 chain structure with sequence 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=3EDU OCA].
| + | |
| | | | |
| | ==See Also== | | ==See Also== |
| | *[[Spectrin|Spectrin]] | | *[[Spectrin|Spectrin]] |
| - | | + | == References == |
| - | ==Reference== | + | <references/> |
| - | <ref group="xtra">PMID:019168783</ref><references group="xtra"/><references/>
| + | __TOC__ |
| | + | </StructureSection> |
| | [[Category: Homo sapiens]] | | [[Category: Homo sapiens]] |
| - | [[Category: Morrow, J S.]] | + | [[Category: Morrow, J S]] |
| - | [[Category: Simonovic, I.]] | + | [[Category: Simonovic, I]] |
| - | [[Category: Simonovic, M.]] | + | [[Category: Simonovic, M]] |
| - | [[Category: Stabach, P.]] | + | [[Category: Stabach, P]] |
| - | [[Category: Steitz, T A.]] | + | [[Category: Steitz, T A]] |
| | [[Category: Actin capping]] | | [[Category: Actin capping]] |
| | [[Category: Actin-binding]] | | [[Category: Actin-binding]] |
| Structural highlights
Disease
[SPTB1_HUMAN] Defects in SPTB are the cause of elliptocytosis type 3 (EL3) [MIM:182870]. EL3 is a Rhesus-unlinked form of hereditary elliptocytosis, a genetically heterogeneous, autosomal dominant hematologic disorder. It is characterized by variable hemolytic anemia and elliptical or oval red cell shape.[1] [2] [3] [4] Defects in SPTB are the cause of spherocytosis type 2 (SPH2) [MIM:182870]; also known as hereditary spherocytosis type 2 (HS2). Spherocytosis is a hematologic disorder leading to chronic hemolytic anemia and characterized by numerous abnormally shaped erythrocytes which are generally spheroidal. SPH2 is characterized by severe hemolytic anemia. Inheritance is autosomal dominant.
Function
[SPTB1_HUMAN] Spectrin is the major constituent of the cytoskeletal network underlying the erythrocyte plasma membrane. It associates with band 4.1 and actin to form the cytoskeletal superstructure of the erythrocyte plasma membrane.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Spectrin and ankyrin participate in membrane organization, stability, signal transduction, and protein targeting; their interaction is critical for erythrocyte stability. Repeats 14 and 15 of betaI-spectrin are crucial for ankyrin recognition, yet the way spectrin binds ankyrin while preserving its repeat structure is unknown. We have solved the crystal structure of the betaI-spectrin 14,15 di-repeat unit to 2.1 A resolution and found 14 residues critical for ankyrin binding that map to the end of the helix C of repeat 14, the linker region, and the B-C loop of repeat 15. The tilt (64 degrees) across the 14,15 linker is greater than in any published di-repeat structure, suggesting that the relative positioning of the two repeats is important for ankyrin binding. We propose that a lack of structural constraints on linker and inter-helix loops allows proteins containing spectrin-like di-repeats to evolve diverse but specific ligand-recognition sites without compromising the structure of the repeat unit. The linker regions between repeats are thus critical determinants of both spectrin's flexibility and polyfunctionality. The putative coupling of flexibility and ligand binding suggests a mechanism by which spectrin might participate in mechanosensory regulation.
The structure of the ankyrin-binding site of beta-spectrin reveals how tandem spectrin-repeats generate unique ligand-binding properties.,Stabach PR, Simonovic I, Ranieri MA, Aboodi MS, Steitz TA, Simonovic M, Morrow JS Blood. 2009 May 28;113(22):5377-84. Epub 2009 Jan 23. PMID:19168783[5]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Sahr KE, Coetzer TL, Moy LS, Derick LH, Chishti AH, Jarolim P, Lorenzo F, Miraglia del Giudice E, Iolascon A, Gallanello R, et al.. Spectrin cagliari. an Ala-->Gly substitution in helix 1 of beta spectrin repeat 17 that severely disrupts the structure and self-association of the erythrocyte spectrin heterodimer. J Biol Chem. 1993 Oct 25;268(30):22656-62. PMID:8226774
- ↑ Gallagher PG, Weed SA, Tse WT, Benoit L, Morrow JS, Marchesi SL, Mohandas N, Forget BG. Recurrent fatal hydrops fetalis associated with a nucleotide substitution in the erythrocyte beta-spectrin gene. J Clin Invest. 1995 Mar;95(3):1174-82. PMID:7883966 doi:http://dx.doi.org/10.1172/JCI117766
- ↑ Parquet N, Devaux I, Boulanger L, Galand C, Boivin P, Lecomte MC, Dhermy D, Garbarz M. Identification of three novel spectrin alpha I/74 mutations in hereditary elliptocytosis: further support for a triple-stranded folding unit model of the spectrin heterodimer contact site. Blood. 1994 Jul 1;84(1):303-8. PMID:8018926
- ↑ Tse WT, Lecomte MC, Costa FF, Garbarz M, Feo C, Boivin P, Dhermy D, Forget BG. Point mutation in the beta-spectrin gene associated with alpha I/74 hereditary elliptocytosis. Implications for the mechanism of spectrin dimer self-association. J Clin Invest. 1990 Sep;86(3):909-16. PMID:1975598 doi:http://dx.doi.org/10.1172/JCI114792
- ↑ Stabach PR, Simonovic I, Ranieri MA, Aboodi MS, Steitz TA, Simonovic M, Morrow JS. The structure of the ankyrin-binding site of beta-spectrin reveals how tandem spectrin-repeats generate unique ligand-binding properties. Blood. 2009 May 28;113(22):5377-84. Epub 2009 Jan 23. PMID:19168783 doi:10.1182/blood-2008-10-184291
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