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Zhang W, Zhang Y, Shi X, Wang S, Bao Y. Hemoglobin wonders: a fascinating gas transporter dive into molluscs. Crit Rev Biochem Mol Biol 2023; 58:132-157. [PMID: 38189101 DOI: 10.1080/10409238.2023.2299381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 12/21/2023] [Indexed: 01/09/2024]
Abstract
Hemoglobin (Hb) has been identified in at least 14 molluscan taxa so far. Research spanning over 130 years on molluscan Hbs focuses on their genes, protein structures, functions, and evolution. Molluscan Hbs are categorized into single-, two-, and multiple-domain chains, including red blood cell, gill, and extracellular Hbs, based on the number of globin domains and their respective locations. These Hbs exhibit variation in assembly, ranging from monomeric and dimeric to higher-order multimeric forms. Typically, molluscan Hbs display moderately high oxygen affinity, weak cooperativity, and varying pH sensitivity. Hb's potential role in antimicrobial pathways could augment the immune defense of bivalves, which may be a complement to their lack of adaptive immunity. The role of Hb as a respiratory protein in bivalves likely originated from the substitution of hemocyanin. Molluscan Hbs demonstrate adaptive evolution in response to environmental changes via various strategies (e.g. increasing Hb types, multimerization, and amino acid residue substitutions at key sites), enhancing or altering functional properties for habitat adaptation. Concurrently, an increase in Hb assembly diversity, coupled with a downward trend in oxygen affinity, is observed during molluscan differentiation and evolution. Hb in Protobranchia, Heteroconchia, and Pteriomorphia bivalves originated from separate ancestors, with Protobranchia inheriting a relative ancient molluscan Hb gene. In bivalves, extracellular Hbs share a common origin, while gill Hbs likely emerged from convergent evolution. In summary, research on molluscan Hbs offers valuable insights into the origins, biological variations, and adaptive evolution of animal Hbs.
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Affiliation(s)
- Weifeng Zhang
- Key Laboratory of Aquatic Germplasm Resource of Zhejiang, College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, China
- Ninghai Institute of Mariculture Breeding and Seed Industry, Zhejiang Wanli University, Ningbo, China
- School of Marine Science, Ningbo University, Ningbo, China
| | - Yang Zhang
- Key Laboratory of Breeding Biotechnology and Sustainable Aquaculture, Key Laboratory of Tropical Marine Bio-resources and Ecology and Guangdong Provincial Key Laboratory of Applied Marine Biology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China
| | - Xizhi Shi
- School of Marine Science, Ningbo University, Ningbo, China
| | - Shi Wang
- Sars-Fang Centre & MOE Key Laboratory of Marine Genetics and Breeding, Ocean University of China and National Laboratory for Marine Science and Technology (LMBB & LMFSFPP), Qingdao, China
| | - Yongbo Bao
- Key Laboratory of Aquatic Germplasm Resource of Zhejiang, College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, China
- Ninghai Institute of Mariculture Breeding and Seed Industry, Zhejiang Wanli University, Ningbo, China
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2
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Montes-Rodríguez IM, Cadilla CL, López-Garriga J, González-Méndez R. Bioinformatic Characterization and Molecular Evolution of the Lucina pectinata Hemoglobins. Genes (Basel) 2022; 13:2041. [PMID: 36360278 PMCID: PMC9690805 DOI: 10.3390/genes13112041] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 10/24/2022] [Accepted: 10/26/2022] [Indexed: 10/01/2023] Open
Abstract
(1) Introduction: Lucina pectinata is a clam found in sulfide-rich mud environments that has three hemoglobins believed to be responsible for the transport of hydrogen sulfide (HbILp) and oxygen (HbIILp and HbIIILp) to chemoautotrophic endosymbionts. The physiological roles and evolution of these globins in sulfide-rich environments are not well understood. (2) Methods: We performed bioinformatic and phylogenetic analyses with 32 homologous mollusk globin sequences. Phylogenetics suggests a first gene duplication resulting in sulfide binding and oxygen binding genes. A more recent gene duplication gave rise to the two oxygen-binding hemoglobins. Multidimensional scaling analysis of the sequence space shows evolutionary drift of HbIILp and HbIIILp, while HbILp was closer to the Calyptogena hemoglobins. Further corroboration is seen by conservation in the coding region of hemoglobins from L. pectinata compared to those from Calyptogena. (3) Conclusions: Presence of glutamine in position E7 in organisms living in sulfide-rich environments can be considered an adaptation to prevent loss of protein function. In HbILp a substitution of phenylalanine in position B10 is accountable for its unique reactivity towards H2S. It appears that HbILp has been changing over time, apparently not subject to functional constraints of binding oxygen, and acquired a unique function for a specialized environment.
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Affiliation(s)
- Ingrid M. Montes-Rodríguez
- Cancer Biology Division, PROMIC, Comprehensive Cancer Center of the University of Puerto Rico, San Juan, PR 00936-3027, USA
| | - Carmen L. Cadilla
- Department of Biochemistry, School of Medicine, University of Puerto Rico-Medical Sciences Campus, San Juan, PR 00936-5067, USA
| | - Juan López-Garriga
- Department of Chemistry, Faculty of Arts and Sciences, University of Puerto Rico—Mayagüez Campus, Mayagüez, PR 00681-9000, USA
| | - Ricardo González-Méndez
- Department of Radiological Sciences, School of Medicine, University of Puerto Rico-Medical Sciences Campus, San Juan, PR 00936-5067, USA
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3
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Microscopic anatomy of gonadal area in the deep-sea clam Calyptogena pacifica (Bivalvia: Vesicomyidae) with emphasis on somatic cells. Tissue Cell 2022; 75:101743. [DOI: 10.1016/j.tice.2022.101743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Revised: 01/18/2022] [Accepted: 01/20/2022] [Indexed: 11/23/2022]
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4
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Ip JCH, Xu T, Sun J, Li R, Chen C, Lan Y, Han Z, Zhang H, Wei J, Wang H, Tao J, Cai Z, Qian PY, Qiu JW. Host-Endosymbiont Genome Integration in a Deep-Sea Chemosymbiotic Clam. Mol Biol Evol 2021; 38:502-518. [PMID: 32956455 PMCID: PMC7826175 DOI: 10.1093/molbev/msaa241] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Endosymbiosis with chemosynthetic bacteria has enabled many deep-sea invertebrates to thrive at hydrothermal vents and cold seeps, but most previous studies on this mutualism have focused on the bacteria only. Vesicomyid clams dominate global deep-sea chemosynthesis-based ecosystems. They differ from most deep-sea symbiotic animals in passing their symbionts from parent to offspring, enabling intricate coevolution between the host and the symbiont. Here, we sequenced the genomes of the clam Archivesica marissinica (Bivalvia: Vesicomyidae) and its bacterial symbiont to understand the genomic/metabolic integration behind this symbiosis. At 1.52 Gb, the clam genome encodes 28 genes horizontally transferred from bacteria, a large number of pseudogenes and transposable elements whose massive expansion corresponded to the timing of the rise and subsequent divergence of symbiont-bearing vesicomyids. The genome exhibits gene family expansion in cellular processes that likely facilitate chemoautotrophy, including gas delivery to support energy and carbon production, metabolite exchange with the symbiont, and regulation of the bacteriocyte population. Contraction in cellulase genes is likely adaptive to the shift from phytoplankton-derived to bacteria-based food. It also shows contraction in bacterial recognition gene families, indicative of suppressed immune response to the endosymbiont. The gammaproteobacterium endosymbiont has a reduced genome of 1.03 Mb but retains complete pathways for sulfur oxidation, carbon fixation, and biosynthesis of 20 common amino acids, indicating the host’s high dependence on the symbiont for nutrition. Overall, the host–symbiont genomes show not only tight metabolic complementarity but also distinct signatures of coevolution allowing the vesicomyids to thrive in chemosynthesis-based ecosystems.
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Affiliation(s)
- Jack Chi-Ho Ip
- Department of Biology, Hong Kong Baptist University, Hong Kong, China.,HKBU Institute of Research and Continuing Education, Virtual University Park, Shenzhen, China.,Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
| | - Ting Xu
- Department of Biology, Hong Kong Baptist University, Hong Kong, China.,HKBU Institute of Research and Continuing Education, Virtual University Park, Shenzhen, China.,Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
| | - Jin Sun
- Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China.,Division of Life Science, Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Runsheng Li
- Department of Infectious Diseases and Public Health, Jockey Club College of Veterinary Medicine and Life Sciences, City University of Hong Kong, Hong Kong, China
| | - Chong Chen
- X-STAR, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Kanagawa Prefecture, Japan
| | - Yi Lan
- Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China.,Division of Life Science, Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Zhuang Han
- Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Science, Sanya, Hainan, China
| | - Haibin Zhang
- Sanya Institute of Deep-Sea Science and Engineering, Chinese Academy of Science, Sanya, Hainan, China
| | - Jiangong Wei
- MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
| | - Hongbin Wang
- MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
| | - Jun Tao
- MLR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, China Geological Survey, Guangzhou, China
| | - Zongwei Cai
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong, China
| | - Pei-Yuan Qian
- Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China.,Division of Life Science, Department of Ocean Science, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Jian-Wen Qiu
- Department of Biology, Hong Kong Baptist University, Hong Kong, China.,HKBU Institute of Research and Continuing Education, Virtual University Park, Shenzhen, China.,Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
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5
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Goto R, Fukumori H, Kano Y, Kato M. Evolutionary gain of red blood cells in a commensal bivalve (Galeommatoidea) as an adaptation to a hypoxic shrimp burrow. Biol J Linn Soc Lond 2018. [DOI: 10.1093/biolinnean/bly104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ryutaro Goto
- Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, Nishimuro, Wakayama, Japan
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan
- Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto, Japan
| | - Hiroaki Fukumori
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan
- Sesoko Station, Tropical Biosphere Research Center, University of the Ryukyus, Motobu, Okinawa, Japan
| | - Yasunori Kano
- Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa, Chiba, Japan
| | - Makoto Kato
- Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto, Japan
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6
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Tame A, Ozawa G, Maruyama T, Yoshida T. Morphological and functional characterization of hemocytes from two deep-sea vesicomyid clams Phreagena okutanii and Abyssogena phaseoliformis. FISH & SHELLFISH IMMUNOLOGY 2018; 74:281-294. [PMID: 29305332 DOI: 10.1016/j.fsi.2017.12.058] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/27/2017] [Accepted: 12/28/2017] [Indexed: 06/07/2023]
Abstract
Deep-sea vesicomyid clams harboring intracellular symbiotic sulfur-oxidizing bacteria are often dominant in chemosynthetic animal communities. Although they are known to have erythrocytes, little is known about other hemocytes. To investigate the types and roles of various hemocytes in vesicomyid clams, we performed morphological, histochemical and functional characterization of the hemocytes in two species, Phreagena okutanii, collected from 873 to 978 m depth, and Abyssogena phaseoliformis, from 5199 to 5355 m. Both were found to have three types of hemocytes: erythrocytes (ERCs), eosinophilic granulocytes (EGs), and basophilic granulocytes (BGs). The ERCs contain hemoglobin in the cytoplasm, with basophilic vacuoles containing acid polysaccharide, neutral lipids, and peroxidase. The EGs were found to contain acid polysaccharides and eosinophilic granules containing lysosomal enzymes, acid and alkaline phosphatases, chloroacetate esterase, and peroxidase. Although BGs had some basophilic granules with alkaline phosphatase, they lacked acid phosphatase and acid polysaccharides. The EGs and BGs were shown to have phagocytic ability, while the ERCs exhibited no phagocytosis. The EGs showed higher phagocytic activity as well as a higher phagosome-lysosome fusion rate than BGs. The hemocytes of the two vesicomyid species differed in the intracellular structures. In A. phaseoliformis, ERCs additionally contained neutral polysaccharides in vacuoles and had vesicles with acinus-like acidic mucus in the cytoplasm, neither of which were observed in P. okutanii. The eosinophilic granules in the EGs had heteromorphically-elongated shapes containing homogeneously electron-dense material in P. okutanii, but were more spherical and composed of fibrous structures in A. phaseoliformis. The difference in hemocytes between the two clams seems to be reflective of phylogenetically differentiated lineages adapting to differing conditions in their respective deep-sea environments, such as dissolved oxygen, hydrogen sulfide concentration, and hydrostatic pressure. In the view of phylogeny of veneroida clams including two vesicomyids, their hemocytes appear to be categorizable into three basic types, with the first containing ERCs and agranulocytes, the second including EGs, and the third comprised of BGs, small eosinophilic granulocytes, and other granulocytes. The present data showed no phagocytic activity of ERCs and a lack of agranulocytes in both vesicomyid species, and when combined with previous reports that other veneroid clams show low or no phagocytic activity, this suggests that ERCs have become evolutionarily differentiated from agranulocytes in the ancestral vesicomyid clam.
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Affiliation(s)
- Akihiro Tame
- Department of Technical Services, Marine Works Japan Ltd., Oppama Higashi-cho, Yokosuka-shi, Kanagawa 237-0063, Japan; School of Marine Biosciences, Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Genki Ozawa
- School of Marine Biosciences, Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Tadashi Maruyama
- School of Marine Biosciences, Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan
| | - Takao Yoshida
- School of Marine Biosciences, Kitasato University, Minami-ku, Sagamihara, Kanagawa 252-0373, Japan; Japan Agency for Marine-Earth Science and Technology, Natsushima-cho, Yokosuka-shi, Kanagawa 237-0061, Japan.
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7
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Decker C, Zorn N, Potier N, Leize-Wagner E, Lallier FH, Olu K, Andersen AC. Globin's structure and function in vesicomyid bivalves from the Gulf of Guinea cold seeps as an adaptation to life in reduced sediments. Physiol Biochem Zool 2014; 87:855-69. [PMID: 25461649 DOI: 10.1086/678131] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Vesicomyid bivalves form dense clam beds in both deep-sea cold seeps and hydrothermal vents. The species diversity within this family raises questions about niche separation and specific adaptations. To compare their abilities to withstand hypoxia, we have studied the structure and function of erythrocyte hemoglobin (Hb) and foot myoglobin (Mb) from two vesicomyid species, Christineconcha regab and Laubiericoncha chuni, collected from the Regab pockmark in the Gulf of Guinea at a depth of 3,000 m. Laubiericoncha chuni possesses three monomeric globins, G1 (15,361 Da), G2 (15,668 Da), and G3 (15,682 Da) in circulating erythrocytes (Hb), and also three globins, G1, G3, and G4 (14,786 Da) in foot muscle (Mb). Therefore, globins G2 and G4 appear to be specific for erythrocytes and muscle, respectively, but globins G1 and G3 are common. In contrast, C. regab lacks erythrocyte Hb completely and possesses only globin monomers G1' (14,941 Da), G2' (15,169 Da), and G3' (15,683 Da) in foot muscle. Thus, these two vesicomyid species, C. regab and L. chuni, show a remarkable diversity in globin expression when examined by electrospray ionization mass spectrometry. Oxygen-binding affinities reveal extremely high oxygen affinities (P50 < 1 Torr, from 5° to 15°C at pH 7.5), in particular L. chuni globins, which might be an advantage allowing L. chuni to dig deeply for sulfides and remain buried for long periods in reduced sediments.
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Affiliation(s)
- C Decker
- IFREMER, Laboratoire Environnement Profond, Unité de Recherche Etude des Ecosystèmes Profonds, F-29280 Plouzané, France; 2Sorbonne Universités, Université Pierre et Marie Curie Université Paris 06, Unité Mixte de Recherche (UMR) 7144, Équipe Adaptation et Biologie des Invertébrés en Conditions Extrêmes, Station Biologique, F-29680 Roscoff, France; 3Centre National de la Recherche Scientifique (CNRS), UMR 7144, Adaptation et Diversité en Milieu Marin, Station Biologique, F-29680 Roscoff, France; 4Laboratoire de Spectrométrie de Masse des Interactions et des Systèmes, UMR 7140, CNRS-Université Louis Pasteur Chimie de la Matière Complexe, F-67008 Strasbourg, France
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8
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Uda K, Yamamoto K, Iwasaki N, Iwai M, Fujikura K, Ellington WR, Suzuki T. Two-domain arginine kinase from the deep-sea clam Calyptogena kaikoi--evidence of two active domains. Comp Biochem Physiol B Biochem Mol Biol 2008; 151:176-82. [PMID: 18639645 DOI: 10.1016/j.cbpb.2008.06.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2008] [Revised: 06/24/2008] [Accepted: 06/25/2008] [Indexed: 11/18/2022]
Abstract
The cDNA and deduced amino acid sequences for arginine kinase (AK) from the deep-sea clam Calyptogena kaikoi have been determined revealing an unusual two-domain (2D) structure with molecular mass of 80 kDa, twice that of normal AK. The amino acid sequences of both domains contain most of the residues thought to be required for substrate binding found in the horseshoe crab Limulus polyphemus AK, a well studied system for which several X-ray crystal structures exist. However, two highly conserved residues, D62 and R193, that form a salt bridge thereby stabilizing the substrate-bound structure have been replaced by G and N in domain 1, and G and P in domain 2, respectively. The present effort probes whether both domains of Calyptogena AK are catalytically competent. Recombinant constructs of the wild-type enzyme of both single domains, and of selected mutants of the Calyptogena AK have been expressed as fusion proteins with the maltose-binding protein. The wild-type two-domain enzyme (2D[WT]) had high AK activity (k(cat)=23 s(- 1), average value of the two domains), and the single domain 2 (D2[WT]) showed 1.5-times higher activity (k(cat)=38 s(- 1)) than the wild-type 2D[WT]. Interestingly, the single domain 1 (D1[WT]) showed only a very low activity (k(cat) approximately 0.016 s(- 1)). Introduction of a Y68A mutation in both domains virtually abolished catalytic activity. On the other hand, significant residual activity was observed (k(cat)=2.8 s(- 1)), when the Y68A mutation was introduced only into domain 2 of the two-domain enzyme. A similar mutation in domain 1 of the two-domain enzyme reduced activity to a much lower extent (k(cat)=11.1 s(- 1)). Although the domains of this "contiguous" dimeric AK each have catalytic capabilities, the presence of domain 2 strongly influences the stability and activity of domain 1.
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Affiliation(s)
- Kouji Uda
- Laboratory of Biochemistry, Faculty of Science, Kochi University, Kochi 780-8520, Japan
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9
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Lieb B, Dimitrova K, Kang HS, Braun S, Gebauer W, Martin A, Hanelt B, Saenz SA, Adema CM, Markl J. Red blood with blue-blood ancestry: intriguing structure of a snail hemoglobin. Proc Natl Acad Sci U S A 2006; 103:12011-6. [PMID: 16877545 PMCID: PMC1567689 DOI: 10.1073/pnas.0601861103] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2006] [Indexed: 11/18/2022] Open
Abstract
The phylogenetic enigma of snail hemoglobin, its isolated occurrence in a single gastropod family, the Planorbidae, and the lack of sequence data, stimulated the present study. We present here the complete cDNA and predicted amino acid sequence of two hemoglobin polypeptides from the planorbid Biomphalaria glabrata (intermediate host snail for the human parasite Schistosoma mansoni). Both isoforms contain 13 different, cysteine-free globin domains, plus a small N-terminal nonglobin "plug" domain with three cysteines for subunit dimerization (total M(r) approximately 238 kDa). We also identified the native hemoglobin molecule and present here a preliminary 3D reconstruction from electron microscopical images (3 nm resolution); it suggests a 3 x 2-mer quaternary structure (M(r) approximately 1.43 MDa). Moreover, we identified a previously undescribed rosette-like hemolymph protein that has been mistaken for hemoglobin. We also detected expression of an incomplete hemocyanin as trace component. The combined data show that B. glabrata hemoglobin evolved from pulmonate myoglobin, possibly to replace a less-efficient hemocyanin, and reveals a surprisingly simple evolutionary mechanism to create a high molecular mass respiratory protein from 78 similar globin domains.
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Affiliation(s)
- Bernhard Lieb
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
| | | | - Hio-Sun Kang
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
| | - Sabrina Braun
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
| | - Wolfgang Gebauer
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
| | - Andreas Martin
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
| | - Ben Hanelt
- Biology Department, University of New Mexico, 269 Castetter Hall, Albuquerque, NM 87131
| | - Steven A. Saenz
- Biology Department, University of New Mexico, 269 Castetter Hall, Albuquerque, NM 87131
| | - Coen M. Adema
- Biology Department, University of New Mexico, 269 Castetter Hall, Albuquerque, NM 87131
| | - Jürgen Markl
- *Institute of Zoology, Johannes Gutenberg University, D-55099 Mainz, Germany; and
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10
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Sanna MT, Manconi B, Castagnola M, Giardina B, Masia D, Messana I, Olianas A, Patamia M, Petruzzelli R, Pellegrini M. Functional and structural characterization of the myoglobin from the polychaete Ophelia bicornis. Biochem J 2005; 389:497-505. [PMID: 15796716 PMCID: PMC1175128 DOI: 10.1042/bj20050267] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The myoglobin of the polychaete annelid Ophelia bicornis was isolated, purified to homogeneity and characterized. The primary structure, obtained from cDNA and protein sequencing, consists of 139 amino acid residues. The alignment with other globin sequences showed that O. bicornis myoglobin misses the pre-A helix and the first six residues of the A helix. The presence of a PheB10-GlnE7 haem distal residue pair is in agreement with the measured oxygen affinity (P50=0.85 mmHg; 1 mmHg=0.133 kPa) and the only slightly higher autoxidation rate constant (0.28 h(-1)) with respect to that of the sperm whale myoglobin mutant E7 His-->Gln (0.21 h(-1)) and to elephant myoglobin (0.1 h(-1)). Oxygen-binding co-operativity was found to be absent under all the examined experimental conditions. The resistance of O. bicornis myoglobin towards autoxidation seems to confirm the important role of part of the A helix in the stability of the globin. The higher pKa of the acid-alkaline ferric transition of O. bicornis with respect to Asian elephant myoglobin, as well as the higher absorbance ratio of its ferric form to the oxy form measured in the Soret region (gammamet/gammaoxy) with respect to that of the African elephant myoglobin, suggested a stronger interaction between the distal glutamine and the water molecule at the sixth co-ordinate position.
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Affiliation(s)
- M Teresa Sanna
- Dipartimento di Scienze Applicate ai Biosistemi, Università di Cagliari, Cittadella Universitaria, I-09042 Monserrato, CA, Italy.
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11
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Suzuki T, Ohta S. The hemoglobin gene of the deep-sea clam Calyptogena soyoae has a novel intron in A-helix. Int J Biochem Cell Biol 2000; 32:1205-11. [PMID: 11137460 DOI: 10.1016/s1357-2725(00)00054-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The cDNAs encoding two dimeric hemoglobins, Hbs I and II, of the deep-sea clam Calyptogena soyoae were amplified by PCR and the complete nucleotide sequences determined. The cDNA-derived amino acid sequences agreed completely with those determined chemically. Many of the molluscan intracellular globin genes have a characteristic four-exon/three-intron structure, with the precoding and two conventional introns conserved widely in animal globin genes. In this work we have determined the exon/intron organization of two hemoglobin genes of the deep-sea clam C. soyoae. Surprisingly, this gene has no precoding intron but instead contains an additional intron in the A-helix (A3.1), together with the two conventional introns (B12.2 and G6.3). This observation suggests that the precoding intron has been lost and the insertion of intron in A-helix occurred in the genes of Calyptogena. Alternatively, the sliding of intron from precoding to A-helix might have occurred.
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Affiliation(s)
- T Suzuki
- Laboratory of Biochemistry, Faculty of Science, Kochi University, Kochi 780-8520, Japan.
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