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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. 1992

P G Gallagher, and W T Tse, and T Coetzer, and M C Lecomte, and M Garbarz, and H S Zarkowsky, and A Baruchel, and S K Ballas, and D Dhermy, and J Palek
Department of Pediatrics, Yale University School of Medicine, New Haven, Connecticut 06510.

We studied nine individuals from five unrelated families with alpha I/46-50a hereditary elliptocytosis (HE) or hereditary pyropoikilocytosis (HPP), including one of the original HHP probands first reported by Zarkowsky and colleagues (1975. Br. J. Haematol. 29:537-543). Biochemical analysis of erythrocyte membrane proteins from these patients revealed, as a common abnormality, the presence of the alpha I/46-50a peptide after limited tryptic digestion of spectrin. The polymerase chain reaction was utilized to study the structure of the DNA encoding the alpha I domain of spectrin in the affected individuals. The DNA sequence of the alpha-spectrin gene encoding the region of the alpha-spectrin chain surrounding the abnormal proteolytic cleavage site was normal. We identified a point mutation causing the replacement of a highly conserved leucine residue by proline at position 207 in the alpha-spectrin chain, a site 51 residues to the amino-terminal side of the abnormal proteolytic cleavage site. Analysis of the proposed triple helical model of spectrin repeats reveals that the mutation occurs in helix 2 at a position directly opposite the abnormal proteolytic cleavage site in helix 3, making this the first report of a mutation occurring in helix 2 of a repeat in the alpha I domain of spectrin. These results add to the molecular heterogeneity of mutations associated with HE/HPP and provide further support for the proposed triple helical model of spectrin. Disruption of this proposed alpha-helical structure by helix-breaking proline substitutions may result in a functionally defective spectrin chain.

UI MeSH Term Description Entries
D008958 Models, Molecular Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures. Molecular Models,Model, Molecular,Molecular Model
D008969 Molecular Sequence Data Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories. Sequence Data, Molecular,Molecular Sequencing Data,Data, Molecular Sequence,Data, Molecular Sequencing,Sequencing Data, Molecular
D009154 Mutation Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations. Mutations
D011487 Protein Conformation The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain). Conformation, Protein,Conformations, Protein,Protein Conformations
D004612 Elliptocytosis, Hereditary An intrinsic defect of erythrocytes inherited as an autosomal dominant trait. The erythrocytes assume an oval or elliptical shape. Ovalocytosis, Hereditary,Elliptocytoses, Hereditary,Hereditary Elliptocytoses,Hereditary Elliptocytosis,Hereditary Ovalocytoses,Hereditary Ovalocytosis,Ovalocytoses, Hereditary
D004907 Erythrocyte Deformability Ability of ERYTHROCYTES to change shape as they pass through narrow spaces, such as the microvasculature. Erythrocyte Filterability,Deformability, Erythrocyte,Filterability, Erythrocyte
D004913 Erythrocytes, Abnormal Oxygen-carrying RED BLOOD CELLS in mammalian blood that are abnormal in structure or function. Abnormal Erythrocytes,Abnormal Erythrocyte,Erythrocyte, Abnormal
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000595 Amino Acid Sequence The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION. Protein Structure, Primary,Amino Acid Sequences,Sequence, Amino Acid,Sequences, Amino Acid,Primary Protein Structure,Primary Protein Structures,Protein Structures, Primary,Structure, Primary Protein,Structures, Primary Protein
D000745 Anemia, Hemolytic, Congenital Hemolytic anemia due to various intrinsic defects of the erythrocyte. Anemia, Hemolytic, Hereditary,Congenital Hemolytic Anemia,Hemolytic Anemia, Congenital,Hemolytic Anemia, Hereditary,Hereditary Hemolytic Anemia,Anemia, Congenital Hemolytic,Anemia, Hereditary Hemolytic,Anemias, Congenital Hemolytic,Anemias, Hereditary Hemolytic,Congenital Hemolytic Anemias,Hemolytic Anemias, Congenital,Hemolytic Anemias, Hereditary,Hereditary Hemolytic Anemias

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