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Contents list for Photochemical & Photobiological Sciences, issue 10, 2008
Front cover
Photochem. Photobiol. Sci., 2008, 7, 1101
DOI: 10.1039/B816328F
Contents and Chemical Biology
Photochem. Photobiol. Sci., 2008, 7, 1103
DOI: 10.1039/B816329B
Editorial
Introduction to the themed issue on tetrapyrrole photoreceptors
Mamoru Mimuro,
Photochem. Photobiol. Sci., 2008, 7, 1113
DOI: 10.1039/b813207k
This issue is a collection of papers presented at the 7th International Conference on Tetrapyrrole Photoreceptors in Photosynthetic Organisms held in Kyoto, December 2007.
Perspectives
Chlorophyll breakdown and chlorophyll catabolites in leaves and fruit
Bernhard Kräutler,
Photochem. Photobiol. Sci., 2008, 7, 1114
DOI: 10.1039/b802356p
When chlorophyll disappears in de-greening leaves and in ripening fruit, colourless, photoinactive tetrapyrrolic catabolites are formed, which may play a physiological role in the plant.
Function and distribution of bilin biosynthesis enzymes in photosynthetic organisms
Thorben Dammeyer and Nicole Frankenberg-Dinkel,
Photochem. Photobiol. Sci., 2008, 7, 1121
DOI: 10.1039/b807209b
A summary of the recent progress in the field of open-chain tetrapyrrole biosynthesis with the focus on heme oxygenases and the family of ferredoxin-dependend bilin reductases.
Regulation and evolution of chlorophyll metabolism
Tatsuru Masuda and Yuichi Fujita,
Photochem. Photobiol. Sci., 2008, 7, 1131
DOI: 10.1039/b807210h
In this perspective review, novel aspects of regulation and evolution of chlorophyll metabolism have been discussed.
A comparative look at the first few milliseconds of the light reactions of photosynthesis
Richard John Cogdell, Alastair Thomas Gardiner, Hideki Hashimoto and Tatas Hardo Panintingjati Brotosudarmo,
Photochem. Photobiol. Sci., 2008, 7, 1150
DOI: 10.1039/b807201a
This mini-review describes and compares our current understanding of the structure/function of photosynthetic light-harvesting complexes and reaction centres.
Cyanobacteriochromes: a new superfamily of tetrapyrrole-binding photoreceptors in cyanobacteria
Masahiko Ikeuchi and Takami Ishizuka,
Photochem. Photobiol. Sci., 2008, 7, 1159
DOI: 10.1039/b802660m
We summarized current status of studies on a novel tetrapyrrole-based photoreceptors, 
cyanobacteriochrome
. Typically, TePixJ shows reversible photoconversion between blue-absorbing form (Pb) and green-absorbing form with concomitant changes in the structure phycoviolobilin.
Bacterial bilin- and flavin-binding photoreceptors
A. Losi and W. Gärtner,
Photochem. Photobiol. Sci., 2008, 7, 1168
DOI: 10.1039/b802472c
This perspective shows that 25% of fully sequenced bacteria possess genes encoding for bilin- or/and for flavin-binding photoreceptors, supposed to sense red or blue light, respectively. In many prokaryotic photoreceptors, the same types of signaling domains are found fused with the chromophore-binding domain, irrespective of the detected light quality (red-/blue light).
Papers
Accumulation of chlorophyllous pigments esterified with the geranylgeranyl group and photosynthetic competence in the CT2256-deleted mutant of the green sulfur bacterium Chlorobium tepidum
Jiro Harada, Shohei Miyago, Tadashi Mizoguchi, Chihiro Azai, Kazuhito Inoue, Hitoshi Tamiaki and Hirozo Oh-oka,
Photochem. Photobiol. Sci., 2008, 7, 1179
DOI: 10.1039/b802435a
The CT22256-deleted mutant of Chl. tepidum accumulated geranylgeranylated (bacterio)chlorophyll a, resulting in decrease of growth rate and larger emission from chlorosomes.
Functional analysis of Arabidopsis thaliana isoforms of the Mg-chelatase CHLI subunit
Koichi Kobayashi, Nobuyoshi Mochizuki, Naho Yoshimura, Ken Motohashi, Toru Hisabori and Tatsuru Masuda,
Photochem. Photobiol. Sci., 2008, 7, 1188
DOI: 10.1039/b802604c
By biochemical and genetic analyses, physiological functions of two isoforms of Arabidopsis CHLI subunits of Mg-chelatase have been clarified.
Characterization of Arabidopsis mutants defective in the regulation of chlorophyllide a oxygenase
Satoshi Kanematsu, Yasuhito Sakuraba, Ayumi Tanaka and Ryouichi Tanaka,
Photochem. Photobiol. Sci., 2008, 7, 1196
DOI: 10.1039/b802584n
We isolated 66 mutants defective in the destabilization mechanism of chlorophyllide a oxygenase (CAO), which catalyzes chlorophyll b synthesis, by a genetic screening using green fluorescent protein (GFP) as a reporter.
Solvent effects on excitation relaxation dynamics of a keto-carotenoid, siphonaxanthin
Seiji Akimoto, Makio Yokono, Michiya Higuchi, Tatsuya Tomo, Shinichi Takaichi, Akio Murakami and Mamoru Mimuro,
Photochem. Photobiol. Sci., 2008, 7, 1206
DOI: 10.1039/b802658k
After an excitation to the S2 state, siphonaxanthin exhibited successive internal conversions, S2 
1(n, 
*) S1. Intensities of the S1 fluorescence with its lifetime of longer than 10 ps were enhanced in methanol.
Spectroscopic properties and bacteriochlorophyll c isomer composition of extramembranous light-harvesting complexes in the green sulfur photosynthetic bacterium Chlorobium tepidum and its CT0388-deleted mutant under vitamin B12-limited conditions
Yoshitaka Saga, Jiro Harada, Hiromitsu Hattori, Kanako Kaihara, Yuki Hirai, Hirozo Oh-oka and Hitoshi Tamiaki,
Photochem. Photobiol. Sci., 2008, 7, 1210
DOI: 10.1039/b802354a
CT0388-deleted mutant cells of Chlorobium tepidum hardly grew in vitamin B12-limited media.
Characterization of cytosolic tetrapyrrole-binding proteins in Arabidopsis thaliana
Shigekazu Takahashi, Takuro Ogawa, Kazuhito Inoue and Tatsuru Masuda,
Photochem. Photobiol. Sci., 2008, 7, 1216
DOI: 10.1039/b802588f
Biochemical properties of cytosolic tetrapyrrole binding proteins of Arabidopsis have been investigated.
Synthesis of zinc bacteriochlorophyll-d analogues with various 17-substituents and their chlorosomal self-aggregates in non-polar organic solvents
Hitoshi Tamiaki, Tomotaka Michitsuji and Reiko Shibata,
Photochem. Photobiol. Sci., 2008, 7, 1225
DOI: 10.1039/b802359j
Chlorosomal self-aggregates of synthetic zinc 31-hydroxy-13-carbonyl-chlorins with the 17-propionate residue 1 and the reversed ester-type isomers 2 in non-polar organic solvents gave the same redmost (Qy) electronic absorption maxima, but the bandwidths were dependent on the 172-substituents.
Covalently linked zinc chlorophyll dimers as a model of a chlorophyllous pair in photosynthetic reaction centers
Hitoshi Tamiaki, Kazuhiro Fukai, Hideki Shimazu, Katsunori Nishide, Yutaka Shibata, Shigeru Itoh and Michio Kunieda,
Photochem. Photobiol. Sci., 2008, 7, 1231
DOI: 10.1039/b802353k
A synthetic heterodimer of zinc chlorophyll derivatives complexed with methanol to give a folded conformer with two red-shifted exciton-coupling bands in the Qy region, while the corresponding homodimers showed single Qy bands.
Functional expression of nitrogenase-like protochlorophyllide reductase from Rhodobacter capsulatus in Escherichia coli
Haruki Yamamoto, Jiro Nomata and Yuichi Fuita,
Photochem. Photobiol. Sci., 2008, 7, 1238
DOI: 10.1039/b802427h
Two components of a nitrogenase-like enzyme protochlorophyllide reductase, L-protein and NB-protein, are expressed as active forms in E. coli.
Light signalling pathways regulating the Mg-chelatase branchpoint of chlorophyll synthesis during de-etiolation in Arabidopsis thaliana
Patrick G. Stephenson and Matthew J. Terry,
Photochem. Photobiol. Sci., 2008, 7, 1243
DOI: 10.1039/b802596g
The aim of this study was to understand the regulation of Mg-porphyrin synthesis during the early stages of de-etiolation in Arabidopsis by investigating the expression of chelatase-related genes under continuous far-red, red, blue and white light in wild-type and photoreceptor mutant seedlings.
Characterization of the photoactive GAF domain of the CikA homolog (SyCikA, Slr1969) of the cyanobacterium Synechocystis sp. PCC 6803
Rei Narikawa, Takayuki Kohchi and Masahiko Ikeuchi,
Photochem. Photobiol. Sci., 2008, 7, 1253
DOI: 10.1039/b811214b
The GAF domain of the cyanobacteriochrome SyCikA covalently binds a linear tetrapyrrole and shows unidirectional photoconversion from a violet-absorbing form (Pv) to a yellow-absorbing form (Py) and partial dark reversion from Py to Pv form.
Expression and purification of pheophorbidase, an enzyme catalyzing the formation of pyropheophorbide during chlorophyll degradation: comparison with the native enzyme
Yasuyo Suzuki, Keiko Soga, Katsuhiko Yoshimatsu and Yuzo Shioi,
Photochem. Photobiol. Sci., 2008, 7, 1260
DOI: 10.1039/b810271f
We constructed an expression system of PPD fused with a GST tag in E. coli and produced a recombinant PPD-GST that has activity comparable to that of the native enzyme.
Regulation of aerobic photosystem synthesis in the purple bacterium Rhodospirillum centenum by CrtJ and AerR
Shinji Masuda, James Berleman, Ben M. Hasselbring and Carl E. Bauer,
Photochem. Photobiol. Sci., 2008, 7, 1267
DOI: 10.1039/b802365b
Rsp. centenum AerR and CrtJ are shown to control readthrough transcription for crtEF, bchCXYZ and puf genes positively and negatively, respectively.
Synthesis of pyrazole substituted methyl pheophorbide-a derivatives and their preliminary in vitro cell viabilities
Oyunbileg Galindev, Narangerel Badraa, Monkhoobor Dalantai, Gerelt-Ireedui Sengee, Demberelnyamba Dorjnamjin and Young Key Shim,
Photochem. Photobiol. Sci., 2008, 7, 1273
DOI: 10.1039/b802433m
We have synthesized methyl pheophorbide-a derivatives bearing pyrazole moieties at 3-position and performed preliminary in vitro biological activities of these derivatives on A549 cancer cells with the intention of searching potential photosensitizers for PDT.
Back matter
Photochem. Photobiol. Sci., 2008, 7, 1282
DOI: 10.1039/B816330H
Back cover
Photochem. Photobiol. Sci., 2008, 7, 1287
DOI: 10.1039/B816331F
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