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Saga Y, Hirota K, Matsui S, Asakawa H, Ishikita H, Saito K. Selective Removal of B800 Bacteriochlorophyll a from Light-Harvesting Complex 2 of the Purple Photosynthetic Bacterium Phaeospirillum molischianum. Biochemistry 2018; 57:3075-3083. [PMID: 29771536 DOI: 10.1021/acs.biochem.8b00259] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The selective removal of B800 bacteriochlorophyll (BChl) a from light-harvesting complex 2 (LH2) in purple photosynthetic bacteria is a clue about elucidation of the mechanism for the transfer of energy from these pigments to B850 BChl a and their roles in the LH2 protein structure. We demonstrated that the kinetics of the removal of B800 BChl a from two representative LH2 proteins derived from Phaeospirillum molischianum and Rhodoblastus acidophilus differed significantly, in contrast to the calculated binding enthalpy. These results may be interpreted as changes in the local structure near B800 BChl a with respect to the geometries of the original crystal structures upon removal of B800 BChl a. Despite the difficulty of removing B800 BChl a from molischianum-LH2, we prepared the molischianum-LH2 protein lacking B800 BChl a by combination of two detergents, n-dodecyl β-d-maltoside and n-octyl β-d-glucoside, under acidic conditions. Spectral and atomic force microscopy analyses indicated that the absence of B800 BChl a had little effect on the local structure in the vicinity of B850 BChl a and the circular arrangement in this protein. These results suggest that the hydrophobic domain near B850 BChl a is rigid and plays a major role in the structural formation of molischianum-LH2.
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Affiliation(s)
- Yoshitaka Saga
- Department of Chemistry, Faculty of Science and Engineering , Kindai University , Higashi-Osaka, Osaka 577-8502 , Japan.,Precursory Research for Embryonic Science and Technology , Japan Science and Technology Agency , Kawaguchi , Saitama 332-0012 , Japan
| | - Keiya Hirota
- Department of Chemistry, Faculty of Science and Engineering , Kindai University , Higashi-Osaka, Osaka 577-8502 , Japan
| | - Sayaka Matsui
- Graduate School of Natural Science and Technology , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Hitoshi Asakawa
- Precursory Research for Embryonic Science and Technology , Japan Science and Technology Agency , Kawaguchi , Saitama 332-0012 , Japan.,Graduate School of Natural Science and Technology , Kanazawa University , Kanazawa 920-1192 , Japan.,Bio-AFM Frontier Research Center , Kanazawa University , Kanazawa 920-1192 , Japan
| | - Hiroshi Ishikita
- Department of Applied Chemistry , The University of Tokyo , Bunkyo-ku, Tokyo 113-8654 , Japan.,Research Center for Advanced Science and Technology , The University of Tokyo , Meguro-ku, Tokyo 153-8904 , Japan
| | - Keisuke Saito
- Department of Applied Chemistry , The University of Tokyo , Bunkyo-ku, Tokyo 113-8654 , Japan.,Research Center for Advanced Science and Technology , The University of Tokyo , Meguro-ku, Tokyo 153-8904 , Japan
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Saga Y, Hirota K, Asakawa H, Takao K, Fukuma T. Reversible Changes in the Structural Features of Photosynthetic Light-Harvesting Complex 2 by Removal and Reconstitution of B800 Bacteriochlorophyll a Pigments. Biochemistry 2017; 56:3484-3491. [DOI: 10.1021/acs.biochem.7b00267] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yoshitaka Saga
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
- Precursory
Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Keiya Hirota
- Department
of Chemistry, Faculty of Science and Engineering, Kindai University, Higashi-Osaka, Osaka 577-8502, Japan
| | - Hitoshi Asakawa
- Precursory
Research for Embryonic Science and Technology, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
- Bio-AFM
Frontier Research Center, Kanazawa University, Kanazawa 920-1192, Japan
| | - Kazufumi Takao
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
| | - Takeshi Fukuma
- Graduate
School of Natural Science and Technology, Kanazawa University, Kanazawa 920-1192, Japan
- Bio-AFM
Frontier Research Center, Kanazawa University, Kanazawa 920-1192, Japan
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Rücker O, Köhler A, Behammer B, Sichau K, Overmann J. Puf operon sequences and inferred structures of light-harvesting complexes of three closely related Chromatiaceae exhibiting different absorption characteristics. Arch Microbiol 2011; 194:123-34. [DOI: 10.1007/s00203-011-0735-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2011] [Revised: 07/05/2011] [Accepted: 07/08/2011] [Indexed: 11/30/2022]
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Tuschak C, Leung MM, Beatty JT, Overmann J. The puf operon of the purple sulfur bacterium Amoebobacter purpureus: structure, transcription and phylogenetic analysis. Arch Microbiol 2005; 183:431-43. [PMID: 16025309 DOI: 10.1007/s00203-005-0016-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2005] [Revised: 05/20/2005] [Accepted: 05/31/2005] [Indexed: 10/25/2022]
Abstract
The puf operon, encoding photosynthetic reaction center and light-harvesting genes, of the purple sulfur phototrophic bacterium Amoebobacter purpureus was cloned and sequenced. This revealed an unusual operon structure of the genes pufB1 A1 LMCB2 A2 B3 A3. The sequence represents the second complete puf operon available for Chromatiaceae. So far, additional sets of light-harvesting 1 (LH1) genes, pufB2 A2 and pufB3 A3 in the region downstream of pufC have only been described for Allochromatium vinosum. Along with reports of multiple LH1 polypeptides found in some Ectothiorhodospiraceae by direct protein sequencing, our results indicate that multiple LH1 genes may occur frequently in phototrophic gamma-proteobacteria. Phylogenetic analyses suggested a coevolution of the core puf genes pufB1 A1 LM. Separate analysis of the LH1 alpha and beta polypeptides revealed a high intraspecies relatedness for the secondary LH1beta polypeptides, possibly caused by functional constraints. In contrast, LH1alpha subunits of Amb. purpureus and Alc. vinosum are closely related (85% sequence identity) which could reflect horizontal gene transfer. RNA analyses suggested co-transcription of all puf genes in Amb. purpureus as a 5.5 kb primary transcript which appears to be more stable than the puf operon primary transcripts of purple non-sulfur bacteria. The 5' end of the transcript mapped to a putative promoter, which contains a -35 region located in an inverted repeat DNA sequence.
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Affiliation(s)
- Christian Tuschak
- Bereich Mikrobiologie, Department Biologie I, Ludwig-Maximilians-Universität München, Maria-Ward-Str. 1a, 80638 München, Germany
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Masuda S, Yoshida M, Nagashima KV, Shimada K, Matsuura K. A new cytochrome subunit bound to the photosynthetic reaction center in the purple bacterium, Rhodovulum sulfidophilum. J Biol Chem 1999; 274:10795-801. [PMID: 10196154 DOI: 10.1074/jbc.274.16.10795] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The nucleotide sequence of the puf operon, which contains the genes encoding the B870 light-harvesting protein and the reaction center complex of the purple photosynthetic bacterium, Rhodovulum sulfidophilum, was determined. The operon, which consisted of six genes, pufQ, pufB, pufA, pufL, pufM, and pufC, is a new variety in photosynthetic bacteria in the sense that pufQ and pufC coexist. The amino acid sequence of the cytochrome subunit of the reaction center deduced from the pufC sequence revealed that this cytochrome contains only three possible heme-binding motifs; the heme-1-binding motif of the corresponding tetraheme cytochrome subunits was not present. This is the first exception of the "tetraheme" cytochrome family in purple bacteria and green filamentous bacteria. The pufC sequence also revealed that the sixth axial ligands to heme-1 and heme-2 irons were not present in the cytochrome either. This cytochrome was actually detected in membrane preparation as a 43-kDa protein and shown to associate functionally with the photosynthetic reaction center as the immediate electron donor to the photo-oxidized special pair of bacteriochlorophyll. This new cytochrome should be useful for studies on the role of each heme in the cytochrome subunit of the bacterial reaction center and the evolution of proteins in photosynthetic electron transfer systems.
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Affiliation(s)
- S Masuda
- Department of Biology, Tokyo Metropolitan University, Minamiohsawa, Hachioji, Tokyo 192-0397, Japan.
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Kortlüke C, Breese K, Gad'on N, Labahn A, Drews G. Structure of the puf operon of the obligately aerobic, bacteriochlorophyll alpha-containing bacterium Roseobacter denitrificans OCh114 and its expression in a Rhodobacter capsulatus puf puc deletion mutant. J Bacteriol 1997; 179:5247-58. [PMID: 9286973 PMCID: PMC179389 DOI: 10.1128/jb.179.17.5247-5258.1997] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Roseobacter denitrificans (Erythrobacter species strain OCh114) synthesizes bacteriochlorophyll a (BChl) and the photosynthetic apparatus only in the presence of oxygen and is unable to carry out primary photosynthetic reactions and to grow photosynthetically under anoxic conditions. The puf operon of R. denitrificans has the same five genes in the same order as in many photosynthetic bacteria, i.e., pufBALMC. PufC, the tetraheme subunit of the reaction center (RC), consists of 352 amino acids (Mr, 39,043); 20 and 34% of the total amino acids are identical to those of PufC of Chloroflexus aurantiacus and Rubrivivax gelatinosus, respectively. The N-terminal hydrophobic domain is probably responsible for anchoring the subunit in the membrane. Four heme-binding domains are homologous to those of PufC in several purple bacteria. Sequences similar to pufQ and pufX of Rhodobacter capsulatus were not detected on the chromosome of R. denitrificans. The puf operon of R. denitrificans was expressed in trans in Escherichia coli, and all gene products were synthesized. The Roseobacter puf operon was also expressed in R. capsulatus CK11, a puf puc double-deletion mutant. For the first time, an RC/light-harvesting complex I core complex was heterologously synthesized. The strongest expression of the R. denitrificans puf operon was observed under the control of the R. capsulatus puf promoter, in the presence of pufQ and pufX and in the absence of pufC. Charge recombination between the primary donor P+ and the primary ubiquinone Q(A)- was observed in the transconjugant, showing that the M and L subunits of the RC were correctly assembled. The transconjugants did not grow photosynthetically under anoxic conditions.
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Affiliation(s)
- C Kortlüke
- Institute of Biology II, Microbiology, Albert Ludwigs University, Freiburg, Germany
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