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Metabolic engineering to produce phytochromes with phytochromobilin, phycocyanobilin, or phycoerythrobilin chromophore in Escherichia coli.
Mukougawa K, Kanamoto H, Kobayashi T, Yokota A, Kohchi T. Mukougawa K, et al. FEBS Lett. 2006 Feb 20;580(5):1333-8. doi: 10.1016/j.febslet.2006.01.051. Epub 2006 Jan 26. FEBS Lett. 2006. PMID: 16458890
By co-expression of heme oxygenase and various bilin reductase(s) in a single operon in conjunction with apophytochrome using two compatible plasmids, we developed a system to produce phytochromes with various chromophores in Escherichia coli. ...The blue-shifted di …
By co-expression of heme oxygenase and various bilin reductase(s) in a single operon in conjunction with apophytochrome using two com …
X-ray structure of Galdieria Rubisco complexed with one sulfate ion per active site.
Okano Y, Mizohata E, Xie Y, Matsumura H, Sugawara H, Inoue T, Yokota A, Kai Y. Okano Y, et al. FEBS Lett. 2002 Sep 11;527(1-3):33-6. doi: 10.1016/s0014-5793(02)03148-4. FEBS Lett. 2002. PMID: 12220629
These reactions require that the active site should be closed by a flexible loop (loop 6) of the large subunit. Rubisco from a red alga, Galdieria partita, has the highest specificity for carboxylation reaction among the Rubiscos hitherto reported. The crystal struc …
These reactions require that the active site should be closed by a flexible loop (loop 6) of the large subunit. Rubisco from a
Continuous spectrophotometric assays for three regulatory enzymes of the arginine biosynthetic pathway.
Takahara K, Akashi K, Yokota A. Takahara K, et al. Anal Biochem. 2007 Sep 15;368(2):138-47. doi: 10.1016/j.ab.2007.06.032. Epub 2007 Jun 22. Anal Biochem. 2007. PMID: 17651682
The rate of AGPR-dependent oxidation of reduced nicotinamide adenine dinucleotide phosphate was monitored continuously as a change in absorbance at 340 nm using spectrophotometry. ...
The rate of AGPR-dependent oxidation of reduced nicotinamide adenine dinucleotide phosphate was monitored continuously as a change in …
Purification and characterization of glutamate N-acetyltransferase involved in citrulline accumulation in wild watermelon.
Takahara K, Akashi K, Yokota A. Takahara K, et al. FEBS J. 2005 Oct;272(20):5353-64. doi: 10.1111/j.1742-4658.2005.04933.x. FEBS J. 2005. PMID: 16218965
Analysis of the corresponding cDNA revealed that these two subunits have molecular masses of 21.3 and 23.5 kDa and are derived from a single precursor polypeptide, suggesting that the CLGAT precursor is cleaved autocatalytically at the conserved ATML motif, as in other glu …
Analysis of the corresponding cDNA revealed that these two subunits have molecular masses of 21.3 and 23.5 kDa and are derived from a
Mechanism of the reaction catalyzed by dehydroascorbate reductase from spinach chloroplasts.
Shimaoka T, Miyake C, Yokota A. Shimaoka T, et al. Eur J Biochem. 2003 Mar;270(5):921-8. doi: 10.1046/j.1432-1033.2003.03452.x. Eur J Biochem. 2003. PMID: 12603325
We analyzed the reaction mechanism of spinach chloroplast DHAR, which had a much higher reaction specificity for DHA than animal enzymes, using a recombinant enzyme expressed in Escherichia coli. ...Bound GSH was released upon reduction of the GSH-enzyme adduct by 2 …
We analyzed the reaction mechanism of spinach chloroplast DHAR, which had a much higher reaction specificity for DHA than animal enzy …
Complementation of phytochrome chromophore-deficient Arabidopsis by expression of phycocyanobilin:ferredoxin oxidoreductase.
Kami C, Mukougawa K, Muramoto T, Yokota A, Shinomura T, Lagarias JC, Kohchi T. Kami C, et al. Proc Natl Acad Sci U S A. 2004 Jan 27;101(4):1099-104. doi: 10.1073/pnas.0307615100. Epub 2004 Jan 13. Proc Natl Acad Sci U S A. 2004. PMID: 14722358 Free PMC article.
To assess the functional consequence of the substitution of PphiB with PCB in plants, the phytochrome chromophore-deficient hy2 mutant of Arabidopsis was transformed with a constitutively expressed pcyA gene that encodes the cyanobacterial enzyme, PCB:ferredoxin oxidoreduc …
To assess the functional consequence of the substitution of PphiB with PCB in plants, the phytochrome chromophore-deficient hy2 mutant of Ar …
Irreversible cross-linking of heme to the distal tryptophan of stromal ascorbate peroxidase in response to rapid inactivation by H2O2.
Kitajima S, Shimaoka T, Kurioka M, Yokota A. Kitajima S, et al. FEBS J. 2007 Jun;274(12):3013-20. doi: 10.1111/j.1742-4658.2007.05829.x. Epub 2007 May 17. FEBS J. 2007. PMID: 17509080
We found that, when the enzyme is inactivated by H2O2, a heme at the catalytic site of a stromal APX isoform is irreversibly cross-linked to a tryptophan residue facing the distal cavity. ...This is the first report of a mutation that improves the tole …
We found that, when the enzyme is inactivated by H2O2, a heme at the catalytic site of a stromal APX isoform is irreversibly c …
The tomato photomorphogenetic mutant, aurea, is deficient in phytochromobilin synthase for phytochrome chromophore biosynthesis.
Muramoto T, Kami C, Kataoka H, Iwata N, Linley PJ, Mukougawa K, Yokota A, Kohchi T. Muramoto T, et al. Plant Cell Physiol. 2005 Apr;46(4):661-5. doi: 10.1093/pcp/pci062. Epub 2005 Feb 2. Plant Cell Physiol. 2005. PMID: 15695440
By expressed sequence tag (EST)-based screening of sequence databases, we found a tomato gene that encodes a protein homologous to Arabidopsis HY2 for phytochromobilin synthase catalyzing the last step of phytochrome chromophore biosynthesis. ...These results indica …
By expressed sequence tag (EST)-based screening of sequence databases, we found a tomato gene that encodes a protein homologou …
An inserted loop region of stromal ascorbate peroxidase is involved in its hydrogen peroxide-mediated inactivation.
Kitajima S, Tomizawa K, Shigeoka S, Yokota A. Kitajima S, et al. FEBS J. 2006 Jun;273(12):2704-10. doi: 10.1111/j.1742-4658.2006.05286.x. FEBS J. 2006. PMID: 16817898
Analysis of these showed that a region between residues 245 and 287 was involved in the inactivation by hydrogen peroxide. A 16-residue amino acid sequence (249-264) found in this region of the stromal ascorbate peroxidase was not found in other ascorbate peroxidase …
Analysis of these showed that a region between residues 245 and 287 was involved in the inactivation by hydrogen peroxide. A 1 …
Expression and biochemical properties of a ferredoxin-dependent heme oxygenase required for phytochrome chromophore synthesis.
Muramoto T, Tsurui N, Terry MJ, Yokota A, Kohchi T. Muramoto T, et al. Plant Physiol. 2002 Dec;130(4):1958-66. doi: 10.1104/pp.008128. Plant Physiol. 2002. PMID: 12481078 Free PMC article.
The HY1 gene of Arabidopsis encodes a plastid heme oxygenase (AtHO1) required for the synthesis of the chromophore of the phytochrome family of plant photoreceptors. ...Purified recombinant AtHO1, after glutathione S-transferase cleavage, is a hemoprotein that forms …
The HY1 gene of Arabidopsis encodes a plastid heme oxygenase (AtHO1) required for the synthesis of the chromophore of the phytochrome …
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