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Nagatomo S, Kitagawa T, Nagai M. Roles of Fe-Histidine bonds in stability of hemoglobin: Recognition of protein flexibility by Q Sepharose. Biophys J 2021; 120:2734-2745. [PMID: 34087219 DOI: 10.1016/j.bpj.2021.05.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 04/22/2021] [Accepted: 05/07/2021] [Indexed: 11/24/2022] Open
Abstract
Using various mutants, we investigated to date the roles of the Fe-histidine (F8) bonds in cooperative O2 binding of human hemoglobin (Hb) and differences in roles between α- and β-subunits in the α2β2 tetramer. An Hb variant with a mutation in the heme cavity exhibited an unexpected feature. When the β mutant rHb (βH92G), in which the proximal histidine (His F8) of the β-subunit is replaced by glycine (Gly), was subjected to ion-exchange chromatography (Q Sepharose column) and eluted with an NaCl concentration gradient in the presence of imidazole, yielded two large peaks, whereas the corresponding α-mutant, rHb (αH87G), gave a single peak similar to Hb A. The β-mutant rHb proteins under each peak had identical isoelectric points according to isoelectric focusing electrophoresis. Proteins under each peak were further characterized by Sephadex G-75 gel filtration, far-UV CD, 1H NMR, and resonance Raman spectroscopy. We found that rHb (βH92G) exists as a mixture of αβ-dimers and α2β2 tetramers, and that hemes are released from β-subunits in a fraction of the dimers. An approximate amount of released hemes were estimated to be as large as 30% with Raman relative intensities. It is stressed that Q Sepharose columns can distinguish differences in structural flexibility of proteins having identical isoelectric points by altering the exit rates from the porous beads. Thus, the role of Fe-His (F8) bonds in stabilizing the Hb tetramer first described by Barrick et al. was confirmed in this study. In addition, it was found in this study that a specific Fe-His bond in the β-subunit minimizes globin structural flexibility.
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Affiliation(s)
- Shigenori Nagatomo
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
| | - Teizo Kitagawa
- Picobiology Institute, Graduate School of Life Science, University of Hyogo, Ako-gun, Hyogo, Japan.
| | - Masako Nagai
- Research Center for Micro-Nano Technology, Hosei University, Koganei, Tokyo, Japan; School of Health Sciences, College of Medical, Pharmaceutical and Health Sciences, Kanazawa University, Kanazawa, Ishikawa, Japan
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Xu JX, Gao HH. Hemoglobin Saint Etienne Found in a Chinese Family. Acta Haematol 2020; 142:120-122. [PMID: 31112948 DOI: 10.1159/000494797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 10/24/2018] [Indexed: 11/19/2022]
Affiliation(s)
- Jian-Xin Xu
- Department of Pediatrics, Zhejiang University Jinhua Hospital, Jinhua, China,
| | - Hai-Hong Gao
- Department of Pediatrics, Zhejiang University Jinhua Hospital, Jinhua, China
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Benzoni E, Giannone V, Michetti L, Seia M, Cavalleri L, Curcio C. Hb Mozhaisk [β92(F8)His→Arg; HBB: c.278A>G] as a De Novo Mutation in a Child of Mixed Ethnic Origins. Hemoglobin 2018; 41:314-316. [DOI: 10.1080/03630269.2017.1412983] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Elena Benzoni
- Laboratorio Genetica, Fondazione Istituto di Rocovero e Cura a Carattere Scientifico (IRCCS) Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italia
| | - Valentina Giannone
- Laboratorio Genetica, Fondazione Istituto di Rocovero e Cura a Carattere Scientifico (IRCCS) Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italia
| | - Laura Michetti
- Dipartimento di Medicina di Laboratorio SmeL Analisi Chimico Cliniche, Azienda Socio Sanitaria Territoriale (ASST), Papa Giovanni XXIII, Bergamo, Italia
| | - Manuela Seia
- Laboratorio Genetica, Fondazione Istituto di Rocovero e Cura a Carattere Scientifico (IRCCS) Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italia
| | - Laura Cavalleri
- Unità Operativa Complessa di Pediatrica, Azienda Socio Sanitaria Territoriale (ASST), Papa Giovanni XXIII, Bergamo, Italia
| | - Cristina Curcio
- Laboratorio Genetica, Fondazione Istituto di Rocovero e Cura a Carattere Scientifico (IRCCS) Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italia
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Pires IS, Belcher DA, Palmer AF. Quantification of Active Apohemoglobin Heme-Binding Sites via Dicyanohemin Incorporation. Biochemistry 2017; 56:5245-5259. [PMID: 28846391 DOI: 10.1021/acs.biochem.7b00683] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Apohemoglobin (apoHb) is produced by removing heme from hemoglobin (Hb). However, preparations of apoHb may contain damaged globins, which render total protein assays inaccurate for active apoHb quantification. Fortunately, apoHb heme-binding sites react with heme via the proximal histidine-F8 (His-F8) residue, which can be monitored spectrophotometrically. The bond between the His-F8 residue of apoHb and heme is vital for maintenance of fully functional and cooperative Hb. Additionally, most apoHb drug delivery applications facilitate hydrophobic drug incorporation inside the apoHb hydrophobic heme-binding pocket in which the His-F8 residue resides. This makes the His-F8 residue a proper target for apoHb activity quantification. In this work, dicyanohemin (DCNh), a stable monomeric porphyrin species, was used as a probe molecule to quantify active apoHb through monocyanohemin-His-F8 bond formation. ApoHb activity was quantified via the analysis of the 420 nm equilibrium absorbance of DCNh and apoHb mixtures. His-F8 saturation was determined by the presence of an inflection point from a plot of the 420 nm absorbance of a fixed concentration of apoHb against an increasing DCNh concentration. Various concentrations of a stock apoHb solution were tested to demonstrate the precision of the assay. The accuracy of the assay was assessed via spectral deconvolution, confirming His-F8 saturation at the inflection point. The effect of the heme-binding protein bovine serum albumin and precipitated apoHb on assay sensitivity was not significant. An analysis of the biophysical properties of reconstituted Hb confirmed heme-binding pocket activity. Taken together, this assay provides a simple and reliable method for determination of apoHb activity.
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Affiliation(s)
- Ivan S Pires
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University , Columbus, Ohio 43210, United States
| | - Donald A Belcher
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University , Columbus, Ohio 43210, United States
| | - Andre F Palmer
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University , Columbus, Ohio 43210, United States
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Au NHC, Wong AYK, Vickars L, MacGillivray RTA, Wadsworth LD. Two new examples of Hb St. Etienne [beta 92(F8)HisGln] in association with venous thrombosis. Hemoglobin 2009; 33:95-100. [PMID: 19373584 DOI: 10.1080/03630260902817206] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Hb St. Etienne [beta92(F8)HisGln] (also known as Hb Istanbul) is a rare unstable beta-globin chain variant that has been described in only three reports involving four patients. We report two individuals in a family of Scottish extraction whose members had been erroneously diagnosed to have hereditary spherocytosis (HS) and have now been shown to be heterozygotes for Hb St. Etienne. They also had venous thrombotic events with minimal provocation. This family illustrates the difficulties in identifying the cause of chronic hemolytic anemia and highlights the possible contribution of chronic hemolysis to increased risk of thrombosis.
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Affiliation(s)
- Nicholas H C Au
- Department of Pathology and Laboratory Medicine, University of British Columbia, Vancouver, BC, Canada
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de Weinstein BI, Plaseska-Karanfilska D, Efremov GD. Hb Saint Etienne or Hb Istanbul [beta92(F8)His-->Gln] found in an Argentinean family. Hemoglobin 2000; 24:149-52. [PMID: 10870887 DOI: 10.3109/03630260009003435] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- B I de Weinstein
- Hospital Frances, Laboratorio de Hematologia, Buenos Aires, Argentina
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Uma S, Matts RL, Guo Y, White S, Chen JJ. The N-terminal region of the heme-regulated eIF2alpha kinase is an autonomous heme binding domain. EUROPEAN JOURNAL OF BIOCHEMISTRY 2000; 267:498-506. [PMID: 10632719 DOI: 10.1046/j.1432-1327.2000.01021.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The N-terminal domain (NTD) of the heme-regulated eukaryotic initiation factor (eIF)2alpha kinase (HRI) was aligned to sequences in the NCBI data base using ENTREZ and a PAM250 matrix. Significant similarity was found between amino acids 11-118 in the NTD of rabbit HRI and amino acids 16-120 in mammalian alpha-globins. Several conserved amino acid residues present in globins are conserved in the NTD of HRI. His83 of HRI was predicted to be equivalent to the proximal heme ligand (HisF8) that is conserved in all globins. Molecular modeling of the NTD indicated that its amino acid sequence was compatible with the globin fold. Recombinant NTD (residues 1-159) was expressed in Escherichia coli. Spectral analysis of affinity purified recombinant NTD indicated that the NTD contained stably bound hemin. Mutational analysis indicated that His83 played a critical structural role in the stable binding of heme to the NTD, and was required to stabilize full length HRI synthesized de novo in the rabbit reticulocyte lysate. These results indicate that the NTD of HRI is an autonomous heme-binding domain, with His83 possibly serving as the proximal heme binding ligand.
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Affiliation(s)
- S Uma
- Department of Biochemistry, Oklahoma State University, Stillwater, USA
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Shelver D, Thorsteinsson MV, Kerby RL, Chung SY, Roberts GP, Reynolds MF, Parks RB, Burstyn JN. Identification of two important heme site residues (cysteine 75 and histidine 77) in CooA, the CO-sensing transcription factor of Rhodospirillum rubrum. Biochemistry 1999; 38:2669-78. [PMID: 10052937 DOI: 10.1021/bi982658j] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The CO-sensing mechanism of the transcription factor CooA from Rhodospirillum rubrum was studied through a systematic mutational analysis of potential heme ligands. Previous electron paramagnetic resonance (EPR) spectroscopic studies on wild-type CooA suggested that oxidized (FeIII) CooA contains a low-spin heme with a thiolate ligand, presumably a cysteine, bound to its heme iron. In the present report, electronic absorption and EPR analysis of various substitutions at Cys residues establish that Cys75 is a heme ligand in FeIII CooA. However, characterization of heme stability and electronic properties of purified C75S CooA suggest that Cys75 is not a ligand in FeII CooA. Mutational analysis of all CooA His residues showed that His77 is critical for CO-stimulated transcription. On the basis of findings that H77Y CooA is perturbed in its FeII electronic properties and is unable to bind DNA in a site-specific manner in response to CO, His77 appears to be an axial ligand to FeII CooA. These results imply a ligand switch from Cys75 to His77 upon reduction of CooA. In addition, an interaction has been identified between Cys75 and His77 in FeIII CooA that may be involved in the CO-sensing mechanism. Finally, His77 is necessary for the proper conformational change of CooA upon CO binding.
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Affiliation(s)
- D Shelver
- Department of Bacteriology, University of Wisconsin-Madison 53706, USA
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Monson EK, Ditta GS, Helinski DR. The oxygen sensor protein, FixL, of Rhizobium meliloti. Role of histidine residues in heme binding, phosphorylation, and signal transduction. J Biol Chem 1995; 270:5243-50. [PMID: 7890634 DOI: 10.1074/jbc.270.10.5243] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The two-component system sensor/response regulator pair, FixL/FixJ, controls the expression of Rhizobium meliloti nitrogen fixation (nif and fix) genes in response to changes in oxygen concentration. A truncated version of FixL, FixL*, is an oxygen-binding hemoprotein kinase that phosphorylates and dephosphorylates the nif and fix gene transcriptional activator, FixJ. Phosphorylation of FixJ is required for optimal transcriptional activation, and anaerobic conditions in vitro result in a substantial increase in the level of FixJ-phosphate. In this study, site-directed mutagenesis was carried out at histidine residues in FixL*. Mutant FixL* derivatives were purified and analyzed in vitro for their heme/oxygen binding properties and phosphorylation/dephosphorylation activities. Mutation of histidine 285, the putative autophosphorylation site, to glutamine results in the loss of FixL* phosphorylation activities. However, this mutant protein retains a substantial level of FixJ-phosphate dephosphorylation activity. Mutation of histidine 194 to asparagine results in the loss of heme binding and in the failure of FixL* to regulate its phosphorylation/dephosphorylation activities in response to changes in oxygen concentration. The FixL*H194N mutant protein also exhibits an increased FixJ phosphorylation activity under aerobic conditions. This study provides further evidence for the importance of the heme binding domain of FixL* in regulating FixJ phosphorylation and dephosphorylation activities in response to oxygen.
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Affiliation(s)
- E K Monson
- Department of Biology, University of California, San Diego, La Jolla 92093-0634
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Wajcman H, Vasseur C, Blouquit Y, Santo DE, Peres MJ, Martins MC, Poyart C, Galacteros F. Hemoglobin Redondo [beta 92(F8) His----Asn]: an unstable hemoglobin variant associated with heme loss which occurs in two forms. Am J Hematol 1991; 38:194-200. [PMID: 1951318 DOI: 10.1002/ajh.2830380308] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Hb Redondo [beta 92(F8) His----Asn] illustrates how post-translational structural modifications may modify the phenotypic expression of an unstable hemoglobin. This variant was found in a Portuguese patient suffering from a chronic hemolytic anemia. The electrophoretic pattern demonstrated that it occurred in two forms, both being semi-hemoglobins: the fastest one migrating like HbS and the other like HbA2; after a few days of storage at 4 degrees C the intensity of the slowest Hb fraction decreased while that of the other increased proportionally. In both cases, the RP-HPLC analysis of the tryptic digest of the aminoethylated beta chains demonstrated the presence of an abnormal beta T10 peptide carrying a His----Asx substitution. Microsequence study of these two peptides demonstrated that the slowest abnormal Hb fraction had a beta 92 His----Asn substitution and the fastest a His----Asp at the same site. All these results suggest that the beta 92 His----Asn variant loses readily its heme group and that a deamidation occurs rapidly in vitro, yielding a beta 92 Asp semi-hemoglobin. The oxygen affinity of the patient's red blood cells was increased, leading to a stimulation of erythropoiesis and to a macrocytic hemolytic disease.
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Affiliation(s)
- H Wajcman
- INSERM U299, Hôpital de Bicêtre, Le Kremlin Bicêtre, France
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Harano T, Harano K, Kushida Y, Ueda S, Yoshii A, Nishinarita M. Hb Isehara (or Hb Redondo) [beta 92 (F8) His----Asn]: an unstable variant with a proximal histidine substitution at the heme contact. Hemoglobin 1991; 15:279-90. [PMID: 1787097 DOI: 10.3109/03630269109027880] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A 50-year-old Japanese female patient was found to have hemolytic anemia. Isoelectrofocusing of her hemolysate revealed two abnormal hemoglobin bands, one of which was very close to the Hb A2 band, and the other between the Hb A2 and Hb F bands. CM-cellulose column chromatography of the globin prepared from the abnormal hemoglobin showed that the abnormal chain eluted faster than the normal beta and delta chains; the beta X chain, however, did not separate from the normal beta chain in urea cellulose acetate electrophoresis. An instability test of the patient's hemolysate revealed the presence of an unstable component. Structural analysis of the abnormal beta chain indicated that the histidine residue at beta 92(F8) was replaced by an asparagine or aspartic acid residue. DNA amplified by polymerase chain reaction was sequenced by the dideoxy method. The nucleotide sequence of the beta 92 codon was AAC instead of CAC, suggesting that the amino acid substitution corresponded to His----Asn, which is the same as is found in Hb Redondo or beta 92(F8)His----Asn----Asp.
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Affiliation(s)
- T Harano
- Department of Biochemistry, Kawasaki Medical School, Kurashiki, Japan
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Abstract
About 70 variants of Hb A with associated hemolytic disorders have been reported during the past 30 years. I have classified them according to four grades of severity of chronic hemolysis. Acute episodes of severe hemolysis may be seen in all classes. In addition, some 80 variants without overt hemolysis have given positive results with in vitro hemoglobin instability tests. The stereochemical bases for instability can be conjectured in most cases, although few unstable hemoglobins have actually been studied by X-ray crystallography. The mechanisms for denaturation of normal Hb A and its acceleration in unstable hemoglobins were proposed some 15 years ago. The alterations of membrane lipids and proteins leading to red cell senescence and the relevance of hemoglobin denaturation to this process are presently being investigated. Several "hyperunstable" variants are clinically silent, or equivalent to a thalassemia, probably because of very efficient degradation of the abnormal chains.
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Affiliation(s)
- Y Ohba
- Department of Clinical Laboratory Science, Yamaguchi University School of Medicine, Ube, Japan
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Bird AR, Elliott T, Wilson JB, Webber BB, Hu H, Kutlar A, Kutlar F, Huisman TH. Two rare unstable beta chain variants, Hb Mozhaisk or alpha 2 beta 292(F8)His----Arg and Hb Djelfa or alpha 2 beta 298(Fg5)Val----Ala, each being observed for the second time. Hemoglobin 1989; 13:193-7. [PMID: 2737917 DOI: 10.3109/03630268908998072] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- A R Bird
- Groote Schuur Hospital Observatory, Republic of South Africa
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Spivak VA, Molchanova TP, Aseeva EA, Lutsenko IN. A new abnormal hemoglobin: Hb Mozhaisk beta 92(F8)His leads to Arg. Hemoglobin 1982; 6:169-81. [PMID: 7096107 DOI: 10.3109/03630268209002292] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Cassoly R. Preparation of globin-hemoglobin hybrids: artificially prepared and naturally occurring semihemoglobins. Methods Enzymol 1981; 76:121-5. [PMID: 7329255 DOI: 10.1016/0076-6879(81)76120-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Chen-Marotel J, Braconnier F, Blouquit Y, Martin-Caburi J, Kammerer J, Rosa J. Hemoglobin Bougardirey-Mali beta 119 (GH2) Gly replaced by Val. An electrophoretically silent variant migrating in isoelectrofocusing as Hb F. Hemoglobin 1979; 3:253-62. [PMID: 500370 DOI: 10.3109/03630267908996901] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Hemoglobin Bougardirey-Mali was detected by isoelectrofocusing during a screening in a 32 years old African, a native of Mali. This abnormal Hb, representing 35% of the total, exhibited the same pI as that of Hb F. In contrast, it was indistinguishable from Hb A in all the electrophoretic systems tested, and equally by its resistance to alkaline denaturation. Structural studies have shown that the abnormality was localized on the beta chain. A fingerprint of the tryptic digest of the aminoethylated beta chain indicated the absence of the beta T12 b. The presence of an abnormal beta T12 b was suspected in the T14-15 spot, as indicated by the intensity of staining and its amino acid composition. beta T12 b was isolated by chromatography on PA 35. Its sequential analysis by manual Edman-dansyl degradation showed that glycine 119 was replaced by a valine residue. This mutation is localized in a alpha 1 beta 1 contact, which makes the molecules slightly unstable. The clinical consequences of this mutation seem to be minor; similar observations have been reported for the other Hb mutated at the same locus, i.e. Hb Fannin-Lubbock beta 119 Gly leads to Asp.
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Adams JG, Przywara KP, Heller P, Shamsuddin M. Hemoglobin J Altgeld Gardens. A hemoglobin variant with a substitution of the proximal histidine of the beta-chain. Hemoglobin 1978; 2:403-15. [PMID: 721609 DOI: 10.3109/03630267809007075] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Blouquit Y, Thillet J, Beuzard Y, Vernant JP, Dreyfus B. Structural and functional studies of hemoglobin J Cala-bria: beta64 (E8) Gly leads to Asp. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 492:426-32. [PMID: 884140 DOI: 10.1016/0005-2795(77)90094-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A hemoglobin of high electrophoretic mobility was detected in a French male suffering from an acute leukemia; this hemoglobin was also present in his family. The variant was unstable and possessed an abnormal beta chain, in which a glycyl residue in position 64 (E8) was replaced by an aspartyl residue. This variant constitutes a new case of Hb J Calabria. Since the substituted E8 residue is in close spatial contact with that at B6, it was of interest to compare the properties of Hb J Calabria with those of other hemoglobins bearing substitutions at the same site.
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Thillet J, Blouquit Y, Perrone F, Rosa J. Hemoglobin Pontoise alpha63 Ala replaced by Asp(E12). A new fast moving variant. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 491:16-22. [PMID: 849454 DOI: 10.1016/0005-2795(77)90036-8] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The present report describes structural and functional studies of a new hemoglobin variant, Hb J Pontoise. This abnormal hemoglobin was discovered in a 36 year old Spanish man. The substitution of alpha63 (E12) Ala replaced by Asp is situated at an external site and appears to have no influence on the function of the hemoglobin. Nevertheless, it presents some instability in vitro, as demonstrated by the isopropanol test. This instability could partially explain the low percentage of the abnormal hemoglobin in the hemolysate (12%), since its rate of synthesis was normal.
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Garel MC, Goossens M, Oudart JL, Blouquit Y, Thillet J, Rosa J. Hemoglobin Dakar = Hb Grady: demonstration by a new approach to the analysis of the tryptic core region of the alpha chain and oxygen equilibrium properties. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 453:459-71. [PMID: 999899 DOI: 10.1016/0005-2795(76)90141-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Preliminary studies have suggested that in Hb Dakar, histidine alpha112 was substituted by a glutamine. A re-investigation on this hemoglobin is presented in this report. A structural study has been performed using a new approach to analyse the tryptic core region of the human hemoglobin alpha chain. After tryptic digestion of the aminoethylated alpha chain, a secondary digestion of the tryptic core was carried out with chymotrypsin and with another protease, thermolysin. Analyses of the chymotryptic and thermolytic peptides indicated that the structure of Hb Dakar was identical to that of Hb Grady previously described by Huisman et al. who showed the insertion of three amino acid residues in position alpha115 or alpha118. The insertion, which was localized near two residues involved in the alpha1beta1 contact, did not produce a dissociation into dimers. Functional studies demonstrated a a slightly increased oxygen affinity, a lowered cooperativity and a normal Bohr effect. The low amount of the abnormal hemoglobin (8%) may in part be explained by a slight instability of the molecule.
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Blouquit Y, Arous N, Machado PE, Garel MC. Hb Henri Mondor: beta26 (B8) Glu leads to Val: a variant with a substitution localized at the same position as that of HbE beta26 Glu leads to Lys. FEBS Lett 1976; 72:5-7. [PMID: 1001469 DOI: 10.1016/0014-5793(76)80800-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Garel MC, Blouquit Y, Arous N, Rosa J. Hb Strasbourg alpha2beta2 20 (B2) Val leads to Asp: a variant at the same locus as Hb Olympia beta 20 Val leads to Met. FEBS Lett 1976; 72:1-4. [PMID: 1001451 DOI: 10.1016/0014-5793(76)80799-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Association of hemoglobin Saint Etienne (alpha2beta295F8 His replaced by G1n) with hemoglobins A and F. Synthesis and subunit exchange in vitro. J Biol Chem 1976. [DOI: 10.1016/s0021-9258(17)33302-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Garel MC, Hassan W, Coquelet MT, Goossens M, Rosa J, Arous N. Hemoglobin J Cairo: beta 65 (E9) Lys leads to Gln, A new hemoglobin variant discovered in an Egyptian family. BIOCHIMICA ET BIOPHYSICA ACTA 1976; 420:97-104. [PMID: 1247583 DOI: 10.1016/0005-2795(76)90348-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The present report describes clinical, hematological and biochemical studies of a 27-year old Egyptian woman in whom a fast moving Hb variant was found. The abnormal Hb constituted 48% of the total erythrocyte Hb of the propositus and her father. Structural studies demonstrated that in the abnormal Hb lysine beta 65 is replaced by glutamine. The new Hb mutant is designated hemoglobin J Cairo beta 65 (E9) Lys leads to Gln. This substitution results in only a moderate decrease in cooperativity. No evidence of Hb instability was found. A slight anemic state has been observed in the propositus since she reached adolescence.
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Gacon G, Wajcman H, Labie D, Cosson A. A new unstable hemoglobin mutated in beta 98 (FG 5) Val leads to Ala: hb Djelfa. FEBS Lett 1975; 58:238-40. [PMID: 1225587 DOI: 10.1016/0014-5793(75)80268-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Garel MC, Blouquit Y, Rosa J, Arous N, Romero Garcia C. Hemoglobin Castilla beta 32 (B14) Leu leads to Arg; a new unstable variant producing severe hemolytic disease. FEBS Lett 1975; 58:144-8. [PMID: 1225574 DOI: 10.1016/0014-5793(75)80245-6] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Kirschenbaum DM. A compilation of amino acid analyses of proteins. IX. Residues per mole of protein--7. Hemoglobin, part A--human. Anal Biochem 1975; 65:466-99. [PMID: 1093450 DOI: 10.1016/0003-2697(75)90534-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Thillet J, Caburi J, Brun B, Cohen-Solal M, Garel MC, Minh MN, Rosa J. Abnormal functional properties of Hb Hope alpha C2A beta2 (H14) Gly-Asp: a low oxygen affinity hemoglobin with decreased DPG effect. FEBS Lett 1974; 47:47-52. [PMID: 4426396 DOI: 10.1016/0014-5793(74)80423-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Cohen-Solal M, Blouquit Y, Garel MC, Thillet J, Gaillard L, Creyssel R, Gibaud A, Rosa J. Haemoglobin lyon (β17–18 (A 14–15) Lys-Val → O). ACTA ACUST UNITED AC 1974. [DOI: 10.1016/0005-2795(74)90193-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Solal MC, Labie D. A new case of hemoglobin Genova 2 2 28(B10) Leu leads to Pro. Further studies on the mechanism of instability and defective synthesis. BIOCHIMICA ET BIOPHYSICA ACTA 1973; 295:67-76. [PMID: 4685078 DOI: 10.1016/0005-2795(73)90074-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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