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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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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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del Mar Mañú Pereira M, Coll Sibina MT, García Mateos E, Vives Corrons JL. Hemoglobinopatía Newcastle: utilidad de la cromatografía y descripción del primer caso en España. Med Clin (Barc) 2008; 130:455-8. [DOI: 10.1157/13118108] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Molchanova TP, Kolledey SV, Pronina LC, Mirgorodskaya OA, Musolyamov AC, Abaturov LV, Huisman TH. Unstable Hb Newcastle [beta92(F8)His-->Pro], first case discovered in a Russian patient. Hemoglobin 1999; 23:373-8. [PMID: 10569727 DOI: 10.3109/03630269909090754] [Citation(s) in RCA: 2] [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)
- T P Molchanova
- The Sickle Cell Anemia Foundation Augusta, GA 30912, USA.
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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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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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