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Ming-Tang Chen et al.
Nature biotechnology, 23(12), 1551-1555 (2005-11-22)
The construction of synthetic cell-cell communication networks can improve our quantitative understanding of naturally occurring signaling pathways and enhance our capabilities to engineer coordinated cellular behavior in cell populations. Towards accomplishing these goals in eukaryotes, we developed and analyzed two
P W Hunt et al.
Plant molecular biology, 47(5), 677-692 (2001-12-01)
Haemoglobin genes have been found in a number of plant species, but the number of genes known has been too small to allow effective evolutionary inferences. We present nine new non-symbiotic haemoglobin sequences from a range of plants, including class
Yuki Ishii et al.
Biochimica et biophysica acta, 1745(2), 156-165 (2005-09-01)
Cytokinins are important purine derivatives that act as redifferentiation-inducing hormones to control many processes in plants. Cytokinins such as isopentenyladenine (IPA) and kinetin are very effective at inducing the granulocytic differentiation of human myeloid leukemia HL-60 cells. We examined the
A Azmi et al.
Planta, 213(1), 29-36 (2001-08-29)
Our previous results demonstrated that endogenous cytokinins are involved in the shooty potential of tumors initiated on Eucalyptus globulus plantlets inoculated with Agrobacterium tumefaciens strain 82.139 [A. Azmi et al. (1997a) Plant Sci 127: 81-90]. In order to investigate whether
G A Miura et al.
Plant physiology, 44(3), 372-376 (1969-03-01)
A 6-(gamma,gamma-dimethylallylamino) purine-like compound was found in the culture medium of Rhizopogon roseolus, which had been shown earlier to synthesize zeatin. The role of 6-(gamma,gamma-dimethylallylamino) purine as a precursor of zeatin was studied. Rhizopogon was furnished with 6-(gamma,gamma-dimethylallylamino) purine-8-(14)C. Cochromatography
Wagner de Melo Ferreira et al.
Journal of plant physiology, 163(11), 1126-1134 (2006-10-13)
This study reports the effects of thidiazuron (TDZ) on the endogenous levels of indoleacetic acid (IAA), zeatin, zeatin riboside ([9R]Z), isopentenyladenine and isopentenyladenosine ([9R]iP) as well as structural changes in the apical meristem of Dendrobium Second Love shoots during flower
Christophe Anjard et al.
Development (Cambridge, England), 135(5), 819-827 (2008-01-25)
The social amoeba Dictyostelium discoideum diverged from the line leading to animals shortly after the separation of plants and animals but it retained characteristics of both kingdoms. A GABA(B)-like receptor and a peptide, SDF-2, with homologs found only in animals
Adeyemi O Aremu et al.
Journal of plant physiology, 170(15), 1303-1308 (2013-06-12)
Merwilla plumbea (Lindl.) Speta is an important medicinal plant widely used in traditional medicine. We evaluated the effect of five cytokinins [benzyladenine (BA), 2-isopentenyladenine (2iP), meta-topolin (mT), meta-topolin riboside (mTR), and meta-methoxy-9-tetrahydropyran-2-yl-topolin (MemTTHP)] on the level of phenolic acids and
Yoshio Honma et al.
Leukemia & lymphoma, 43(9), 1729-1735 (2003-04-11)
Although differentiation therapy for patients with acute promyelocytic leukemia (APL) using all-trans retinoic acid (ATRA) has now been established, acute myeloid leukemia (AML) patients with other than APL only show a limited clinical response to ATRA. We must consider novel
Kentaro Takei et al.
Journal of plant research, 116(3), 259-263 (2003-05-03)
We describe a new enzymatic reaction method for the preparation of the radioisotope-labeled cytokinins isopentenyladenine (iP), trans-zeatin (tZ), and their ribosides. The method is based on the three enzyme activities of an adenylate isopentenyltransferase (IPT; EC 2.5.1.27) from Arabidopsis thaliana
Yuto Arata et al.
Plant & cell physiology, 51(12), 2047-2059 (2010-11-05)
We identified two phenylquinazoline compounds in a large-scale screening for cytokinin antagonists in yeast expressing the Arabidopsis cytokinin receptor cytokinin response 1/histidine kinase 4 (CRE1). After chemical modifications, we obtained compound S-4893, which non-competitively inhibited binding of the natural ligand
Jaemyung Choi et al.
Plant & cell physiology, 53(7), 1334-1343 (2012-05-31)
Cytokinins are involved in key developmental processes in rice (Oryza sativa), including the regulation of cell proliferation and grain yield. However, the in vivo action of histidine kinases (OsHks), putative cytokinin receptors, in rice cytokinin signaling remains elusive. This study
Véronique Bergougnoux et al.
PloS one, 7(9), e45255-e45255 (2012-10-11)
Light is one of the most important factor influencing plant growth and development all through their life cycle. One of the well-known light-regulated processes is de-etiolation, i.e. the switch from skotomorphogenesis to photomorphogenesis. The hormones cytokinins (CKs) play an important
Zdenek Kríz et al.
Proteins, 55(2), 258-274 (2004-03-30)
The interactions between the protein and the solvent were analyzed, and protein regions with a high density of water molecules, as well as structural water molecules, were determined by using molecular dynamics (MD) simulations. A number of water molecules that
Ana Elisa Valdés et al.
Journal of plant physiology, 160(11), 1407-1410 (2003-12-09)
Markers for ageing or maturation in woody plants provides the possibility of identifying genotypes with a prolonged juvenile phase, or to evaluate reinvigoration procedures, such as grafting of adult material. This study focuses specifically on cytokinins (Cks) as markers, due
Yuki Ishii et al.
British journal of haematology, 128(4), 540-547 (2005-02-03)
Cytokinins, purine derivatives that act as hormones to control many processes in plants, are very effective at inducing the granulocytic differentiation of human myeloid leukaemia cells. Isopentenyladenine (IPA), a potent cytokinin, significantly induced the expression of CCAAT/enhancer-binding protein (C/EBP)delta, but
Patrick von Aderkas et al.
Tree physiology, 22(6), 431-434 (2002-04-19)
Embryogenic tissue of hybrid larch (Larix x marschlinsii Coaz) was multiplied on Medium M (modified MSG medium supplemented with the plant growth regulators (PGRs) 2,4-dichlorophenoxyacetic acid (2,4-D; 9 microM) and N-6-benzyladenine (2.25 microM)). After 1 week, cultures were transferred to
J P Helgeson et al.
Plant physiology, 44(2), 193-198 (1969-02-01)
The growth rates of tobacco callus tissues on media containing 10(-6) to 10 mum 6-(gamma,gamma-dimethylallylamino)purine (2iP) were measured. At concentrations of 10(-4) mum and above growth rates were exponential and dependent on cytokinin concentration. At 2iP concentrations of 10(-4) to
Zheng Han et al.
Journal of chromatography. B, Analytical technologies in the biomedical and life sciences, 881-882, 83-89 (2011-12-27)
A high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) method for simultaneous determination of five acid/alkaline phytohormones, i.e., indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), naphthylacetic acid (NAA), gibberellic acid (GA(3)) and isopentenyladenine (2IP), in grapes was developed. After optimization, the samples
Ya-Wen He et al.
Journal of experimental botany, 53(368), 505-512 (2002-02-16)
The effects of triacontanol (TRIA), applied singly or in combination with cerium nitrate and lanthanum nitrate, on bolting of Arabidopsis thaliana were studied. Triacontanol (0.1 to 0.6 microM) added to the culture medium induced early bolting. TRIA (0.3 microM) applied
Guek Eng Sim et al.
Plant cell reports, 27(8), 1281-1289 (2008-05-15)
We analysed the endogenous cytokinin levels of Dendrobium Madame Thong-In seedlings grown in vitro during vegetative and flowering-inductive periods. HPLC was used to fractionate the extracts and radioimmunoassay (RIA) was used for assay of zeatin (Z), dihydrozeatin (DZ), N(6)-(Delta(2)-isopentenyl)-adenine (iP)
Zdeněk Trávníček et al.
Organic & biomolecular chemistry, 9(16), 5703-5713 (2011-06-28)
N6-Isopentenyladenine (L1) was subjected to variously acidic media in 0.1 M, 1 M and 2 M HCl. In dependence on the acidity of the medium, the formation of three main acid hydrolysis products, involving the N6-isopentenyladeninium (HL1) (1), 7,8,9,10-tetrahydro-7,7-dimethyl-3H-pyrimido[2,1-i]purin-6-ium (HL2)
Lucie Szücová et al.
Bioorganic & medicinal chemistry, 17(5), 1938-1947 (2009-02-24)
In an attempt to improve specific biological functions of cytokinins routinely used in plant micropropagation, 33 6-benzylamino-9-tetrahydropyran-2-ylpurine (THPP) and 9-tetrahydrofuran-2-ylpurine (THFP) derivatives, with variously positioned hydroxy and methoxy functional groups on the benzyl ring, were prepared. The new derivatives were
Javier Cabello-Villegas et al.
Biochemistry, 43(1), 55-66 (2004-01-07)
Nucleoside base modifications can alter the structures, dynamics, and metal ion binding properties of transfer RNA molecules and are important for accurate aminoacylation and for maintaining translational fidelity and efficiency. The unmodified anticodon stem-loop from Escherichia coli tRNA(Phe) forms a
H Yamada et al.
Plant & cell physiology, 42(9), 1017-1023 (2001-09-29)
Common histidine-to-aspartate (His-->Asp) phosphorelay is a paradigm of signal transduction in both prokaryotes and eukaryotes for the propagation of certain environmental stimuli, in which histidine (His)-kinases play central roles as sensors for environmental signals. For the higher plant, Arabidopsis thaliana
Annie Jacqmard et al.
Planta, 214(6), 970-973 (2002-04-10)
In plants of Sinapis alba L. induced to flower by one long day (LD), previous work showed that the phloem sap feeding the shoot apex is enriched in cytokinins of the isopentenyladenine (iP)-type between 9 and 25 h after start
E Strzelczyk et al.
Acta microbiologica Polonica, 34(2), 177-185 (1985-01-01)
Studies on the effect of post culture liquids of actinomycetes on cytokinin-like substances production by mycorrhizal fungi have revealed that actinomycete metabolites inhibited or stimulated the synthesis of these compounds. The results of chromatographic analyses suggest, that substances stimulating the
Michal Otyepka et al.
Journal of biomolecular structure & dynamics, 20(2), 141-154 (2002-10-02)
This article presents a molecular dynamics (MD) study of the cdk2 enzyme and its two complexes with the inhibitors isopentenyladenine and roscovitine using the Cornell et al. force field from the AMBER software package. The results show that inserting an
Maria Luczkiewicz et al.
Zeitschrift fur Naturforschung. C, Journal of biosciences, 60(7-8), 557-566 (2005-09-17)
A two-stage method for in vitro propagation of six Genista species from shoot tips was developed. Multiple microshoot cultures were obtained by growing the shoot tip explants on Schenk and Hildebrandt medium supplemented with 9.84 microM 6-(gamma,gamma-dimethylallylamino)-purine and 0.99 microM
Takeshi Kuroha et al.
The Plant cell, 21(10), 3152-3169 (2009-10-20)
Cytokinins play crucial roles in diverse aspects of plant growth and development. Spatiotemporal distribution of bioactive cytokinins is finely regulated by metabolic enzymes. LONELY GUY (LOG) was previously identified as a cytokinin-activating enzyme that works in the direct activation pathway
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