3lbx is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[SPTA1_HUMAN] Defects in SPTA1 are the cause of elliptocytosis type 2 (EL2) [MIM:130600]. EL2 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][5][6][7][8][9][10][11][12] Defects in SPTA1 are a cause of hereditary pyropoikilocytosis (HPP) [MIM:266140]. HPP is an autosomal recessive disorder characterized by hemolytic anemia, microspherocytosis, poikilocytosis, and an unusual thermal sensitivity of red cells.[13] Defects in SPTA1 are the cause of spherocytosis type 3 (SPH3) [MIM:270970]; also known as hereditary spherocytosis type 3 (HS3). Spherocytosis is a hematologic disorder leading to chronic hemolytic anemia and characterized by numerous abnormally shaped erythrocytes which are generally spheroidal. SPH3 is characterized by severe hemolytic anemia. Inheritance is autosomal recessive. [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.[14][15][16][17] 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
[SPTA1_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. [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
As the principal component of the membrane skeleton, spectrin confers integrity and flexibility to red cell membranes. Although this network involves many interactions, the most common hemolytic anemia mutations that disrupt erythrocyte morphology affect the spectrin tetramerization domains. Although much is known clinically about the resulting conditions (hereditary elliptocytosis and pyropoikilocytosis), the detailed structural basis for spectrin tetramerization and its disruption by hereditary anemia mutations remains elusive. Thus, to provide further insights into spectrin assembly and tetramer site mutations, a crystal structure of the spectrin tetramerization domain complex has been determined. Architecturally, this complex shows striking resemblance to multirepeat spectrin fragments, with the interacting tetramer site region forming a central, composite repeat. This structure identifies conformational changes in alpha-spectrin that occur upon binding to beta-spectrin, and it reports the first structure of the beta-spectrin tetramerization domain. Analysis of the interaction surfaces indicates an extensive interface dominated by hydrophobic contacts and supplemented by electrostatic complementarity. Analysis of evolutionarily conserved residues suggests additional surfaces that may form important interactions. Finally, mapping of hereditary anemia-related mutations onto the structure demonstrate that most, but not all, local hereditary anemia mutations map to the interacting domains. The potential molecular effects of these mutations are described.
Crystal structure and functional interpretation of the erythrocyte spectrin tetramerization domain complex.,Ipsaro JJ, Harper SL, Messick TE, Marmorstein R, Mondragon A, Speicher DW Blood. 2010 Jun 10;115(23):4843-52. Epub 2010 Mar 2. PMID:20197550[18]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
↑Sahr KE, Tobe T, Scarpa A, Laughinghouse K, Marchesi SL, Agre P, Linnenbach AJ, Marchesi VT, Forget BG. Sequence and exon-intron organization of the DNA encoding the alpha I domain of human spectrin. Application to the study of mutations causing hereditary elliptocytosis. J Clin Invest. 1989 Oct;84(4):1243-52. PMID:2794061 doi:https://dx.doi.org/10.1172/JCI114291
↑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
↑Coetzer TL, Sahr K, Prchal J, Blacklock H, Peterson L, Koler R, Doyle J, Manaster J, Palek J. Four different mutations in codon 28 of alpha spectrin are associated with structurally and functionally abnormal spectrin alpha I/74 in hereditary elliptocytosis. J Clin Invest. 1991 Sep;88(3):743-9. PMID:1679439 doi:https://dx.doi.org/10.1172/JCI115371
↑Floyd PB, Gallagher PG, Valentino LA, Davis M, Marchesi SL, Forget BG. Heterogeneity of the molecular basis of hereditary pyropoikilocytosis and hereditary elliptocytosis associated with increased levels of the spectrin alpha I/74-kilodalton tryptic peptide. Blood. 1991 Sep 1;78(5):1364-72. PMID:1878597
↑Lecomte MC, Garbarz M, Grandchamp B, Feo C, Gautero H, Devaux I, Bournier O, Galand C, d'Auriol L, Galibert F, et al.. Sp alpha I/78: a mutation of the alpha I spectrin domain in a white kindred with HE and HPP phenotypes. Blood. 1989 Aug 15;74(3):1126-33. PMID:2568862
↑Gallagher PG, Tse WT, Coetzer T, Lecomte MC, Garbarz M, Zarkowsky HS, Baruchel A, Ballas SK, Dhermy D, Palek J, et al.. A common type of the spectrin alpha I 46-50a-kD peptide abnormality in hereditary elliptocytosis and pyropoikilocytosis is associated with a mutation distant from the proteolytic cleavage site. Evidence for the functional importance of the triple helical model of spectrin. J Clin Invest. 1992 Mar;89(3):892-8. PMID:1541680 doi:https://dx.doi.org/10.1172/JCI115669
↑Dalla Venezia N, Alloisio N, Forissier A, Denoroy L, Aymerich M, Vives-Corrons JL, Besalduch J, Besson I, Delaunay J. Elliptopoikilocytosis associated with the alpha 469 His-->Pro mutation in spectrin Barcelona (alpha I/50-46b). Blood. 1993 Sep 1;82(5):1661-5. PMID:8364215
↑Morle L, Roux AF, Alloisio N, Pothier B, Starck J, Denoroy L, Morle F, Rudigoz RC, Forget BG, Delaunay J, et al.. Two elliptocytogenic alpha I/74 variants of the spectrin alpha I domain. Spectrin Culoz (GGT----GTT; alpha I 40 Gly----Val) and spectrin Lyon (CTT----TTT; alpha I 43 Leu---Phe). J Clin Invest. 1990 Aug;86(2):548-54. PMID:2384601 doi:https://dx.doi.org/10.1172/JCI114743
↑Alloisio N, Wilmotte R, Morle L, Baklouti F, Marechal J, Ducluzeau MT, Denoroy L, Feo C, Forget BG, Kastally R, et al.. Spectrin Jendouba: an alpha II/31 spectrin variant that is associated with elliptocytosis and carries a mutation distant from the dimer self-association site. Blood. 1992 Aug 1;80(3):809-15. PMID:1638030
↑Morle L, Morle F, Roux AF, Godet J, Forget BG, Denoroy L, Garbarz M, Dhermy D, Kastally R, Delaunay J. Spectrin Tunis (Sp alpha I/78), an elliptocytogenic variant, is due to the CGG----TGG codon change (Arg----Trp) at position 35 of the alpha I domain. Blood. 1989 Aug 1;74(2):828-32. PMID:2568861
↑Perrotta S, Miraglia del Giudice E, Alloisio N, Sciarratta G, Pinto L, Delaunay J, Cutillo S, Iolascon A. Mild elliptocytosis associated with the alpha 34 Arg-->Trp mutation in spectrin Genova (alpha I/74). Blood. 1994 Jun 1;83(11):3346-9. PMID:8193371
↑Perrotta S, Iolascon A, De Angelis F, Pagano L, Colonna G, Cutillo S, Miraglia del Giudice E. Spectrin Anastasia (alpha I/78): a new spectrin variant (alpha 45 Arg-->Thr) with moderate elliptocytogenic potential. Br J Haematol. 1995 Apr;89(4):933-6. PMID:7772539
↑Floyd PB, Gallagher PG, Valentino LA, Davis M, Marchesi SL, Forget BG. Heterogeneity of the molecular basis of hereditary pyropoikilocytosis and hereditary elliptocytosis associated with increased levels of the spectrin alpha I/74-kilodalton tryptic peptide. Blood. 1991 Sep 1;78(5):1364-72. PMID:1878597
↑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:https://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:https://dx.doi.org/10.1172/JCI114792
↑Ipsaro JJ, Harper SL, Messick TE, Marmorstein R, Mondragon A, Speicher DW. Crystal structure and functional interpretation of the erythrocyte spectrin tetramerization domain complex. Blood. 2010 Jun 10;115(23):4843-52. Epub 2010 Mar 2. PMID:20197550 doi:10.1182/blood-2010-01-261396
