Abstract:
:Plant HXXXD acyltransferase-catalyzed malonylation is an important modification reaction in elaborating the structural diversity of flavonoids and anthocyanins, and a universal adaptive mechanism to detoxify xenobiotics. Nicotiana tabacum malonyltransferase 1 (NtMaT1) is a member of anthocyanin acyltransferase subfamily that uses malonyl-CoA (MLC) as donor catalyzing transacylation in a range of flavonoid and naphthol glucosides. To gain insights into the molecular basis underlying its catalytic mechanism and versatile substrate specificity, we resolved the X-ray crystal structure of NtMaT1 to 3.1 Å resolution. The structure comprises two α/β mixed subdomains, as typically found in the HXXXD acyltransferases. The partial electron density map of malonyl-CoA allowed us to reliably dock the entire molecule into the solvent channel and subsequently define the binding sites for both donor and acceptor substrates. MLC bound to the NtMaT1 occupies one end of the long solvent channel between two subdomains. On superimposing and comparing the structure of NtMaT1 with that of an enzyme from anthocyanin acyltransferase subfamily from red chrysanthemum (Dm3Mat3) revealed large architectural variation in the binding sites, both for the acyl donor and for the acceptor, although their overall protein folds are structurally conserved. Consequently, the shape and the interactions of malonyl-CoA with the binding sites' amino acid residues differ substantially. These major local architectural disparities point to the independent, divergent evolution of plant HXXXD acyltransferases in different species. The structural flexibility of the enzyme and the amendable binding pattern of the substrates provide a basis for the evolution of the distinct, versatile substrate specificity of plant HXXXD acyltransferases.
journal_name
Plantajournal_title
Plantaauthors
Manjasetty BA,Yu XH,Panjikar S,Taguchi G,Chance MR,Liu CJdoi
10.1007/s00425-012-1660-8subject
Has Abstractpub_date
2012-09-01 00:00:00pages
781-93issue
3eissn
0032-0935issn
1432-2048journal_volume
236pub_type
杂志文章相关文献
PLANTA文献大全abstract::NADP-specific isocitrate dehydrogenase is a key cytosolic enzyme that links C and N metabolism by supplying C skeletons for primary N assimilation in plants. We report the characterization of the transcript Mc-ICDH1 encoding an NADP-dependent isocitrate dehydrogenase (NADP-ICDH, EC 1.1.1.42) from the facultative halop...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-002-0827-0
更新日期:2002-10-01 00:00:00
abstract::Ultraviolet (UV)-absorbing phenolic compounds that have been shown to be protective against the damaging: effects of UV-B radiation (Tevini et al., 1991, Photochem. Photobiol. 53, 329-333) were found in the leaf epidermis of tropical mangrove tree species. These UV-absorbing phenolic compounds and leaf succulence func...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00216808
更新日期:1992-09-01 00:00:00
abstract::Each plant genome contains a repertoire of β-mannanase genes belonging to glycoside hydrolase family 5 subfamily 7 (GH5_7), putatively involved in the degradation and modification of various plant mannan polysaccharides, but very few have been characterized at the gene product level. The current study presents recombi...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-013-2005-y
更新日期:2014-03-01 00:00:00
abstract::The expansion growth of plant organs is inhibited at low water potentials (Ψ w), but the inhibition has not been compared in different organs of the same plant. Therefore, we determined elongation rates of the roots, stems, leaves, and styles (silks) of maize (Zea mays L.) as soil water was depleted. The Ψ w was measu...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00395973
更新日期:1985-07-01 00:00:00
abstract::The collection phloem in minor veins is distinct from other vein classes in that the minor veins mature during the sink to source transition and are the primary sites of phloem loading. After maturation, minor vein phloem maintains its character in part through minor-vein specific regulatory cascades; however despite ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-008-0786-1
更新日期:2008-10-01 00:00:00
abstract::The new type blue light (BL) receptor aureochrome (AUREO) was recently discovered in a stramenopile alga, Vaucheria (Takahashi et al. Proc Natl Acad Sci USA 104(49):19625-19630, 2007). AUREO has a bZIP (basic region/leucine zipper) and BL-sensing light-oxygen-voltage (LOV) domain and functions as a BL-activated transc...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-009-0967-6
更新日期:2009-08-01 00:00:00
abstract::Isolated embryos are more suitable for in vivo study of protein synthesis than non-isolated embryos because, after isolation, the uptake of labeled amino acids is about 1000 times higher. However, isolation also stimulates protein synthesis: Up to 4 h after isolation, the capacity to incorporate labeled amino acids in...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00385536
更新日期:1981-12-01 00:00:00
abstract::[1-(14)C]glycollate was oxidised to(14)CO2 by peroxisomes isolated from leaves of spinach beet about 3 times as rapidly at 35°C as at 25°C; the rate was further increased with rise in temperature to a maximum at 55°C. These increases are shown to be mainly due to the increased H2O2 available to oxidise glyoxylate non-...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00380687
更新日期:1977-01-01 00:00:00
abstract::Mycorrhizal colonization of genetically modified hybrid aspen (Populus tremula x P. tremuloides Michx.) was investigated over 15 months in a field experiment. The aspen carried the rolC gene from Agrobacterium rhizogenes under control of either the constitutive cauliflower mosaic virus 35S promoter or the light-induci...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250100658
更新日期:2002-02-01 00:00:00
abstract::Respiration rate, ATP content and membrane potential of Lemna have been measured as a function of the concentration of dissolved oxygen. Kinetic analysis showed that within the range from 1 μM to 20 μM O2, the respiration rate of isolated mitochondria and intact plants was a hyperbolic function of the oxygen concentra...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00393171
更新日期:1983-11-01 00:00:00
abstract::The microtubular cytoskeleton has been studied during development of the zygote, proembryo and free-nuclear endosperm inA. thaliana using immunofluorescence localization of tubulin in enzymatically isolated material. Abundant micro tubules (MTs) are found throughout proembryogenesis. Microtubules in the coenocytic end...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF01102418
更新日期:1991-06-01 00:00:00
abstract::Lipid accumulation during pollen and tapetal development was studied using cryostat sections of unfixed anthers from Brassica napus (rapeseed). Diamidino-2-henylindole (DAPI), a DNA fluorochrome, was used to stain the pollen nuclei in order to identify ten stages of pollen development in Brassica. Storage lipids (i.e....
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00195314
更新日期:1992-02-01 00:00:00
abstract::Thermotropism in primary roots of Zea mays L. was studied with respect to gradient strength (°C · cm(--1)), temperature of exposure within a gradient, pre-treatment temperature, and gravitropic stimulation. The magnitude of the response decreased with gradient strength. Maximum thermotropism was independent of gradien...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00195344
更新日期:1991-06-01 00:00:00
abstract::The major storage proteins isolated from wild-type seeds of Arabidopsis thaliana (L.) Heynh., strain "Columbia", were studied by sucrose gradient centrifugation and sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE). Both the hypocotyl and cotyledons of mature embryos contained abundant 12 S (crucife...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00392124
更新日期:1986-11-01 00:00:00
abstract::Freshly isolated protoplasts or separated cells prepared from leaves of Nicotiana tabacum L. cvs. Xanthincor Turkish Samsun exhibit substantially greater incorporation of [(3)H] leucine and [(3)H] uridine into protoplast protein and RNA, respectively, when dilute rather than concentrated suspensions are incubated. Thi...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00387350
更新日期:1976-01-01 00:00:00
abstract::The three-dimensional organization of the microfilamental cytoskeleton of developingGasteria pollen was investigated by light microscopy using whole cells and fluorescently labelled phalloidin. Cells were not fixed chemically but their walls were permeabilized with dimethylsulphoxide and Nonidet P-40 at premicrospore ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00963823
更新日期:1989-12-01 00:00:00
abstract::The response of parsley seedlings (Petroselinum crispum) inoculated with zoospores of the soybean-pathogenic fungus, Phytophthora megasperma f. sp. glycinea, ranged from "immunity" to "physiological susceptibility" depending on the post-inoculation environmental conditions. Typical nonhost resistance reactions, hypers...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00403011
更新日期:1988-02-01 00:00:00
abstract::No phytochrome can be detected spectrophotometrically in soybean (Glycine max (L.) Merr. cv. Mandarin) cell suspensions grown in darkness. White light from a tungsten filament lamp and a band of far-red light have been found to induce the appearance of phytochrome in them. Red light failed to bring about phytochrome i...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00390095
更新日期:1977-01-01 00:00:00
abstract::Solutions of organic substances show differing influences on the direction of phloem transport of (14)C-labeled assimilates in predarkened maize leaf strips, when externally applied to one end of the strip. One group of substances "pushes" the assimilates away from the site of application. Examples of this group are 7...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00399726
更新日期:1976-01-01 00:00:00
abstract::Fatty acid synthesis was studied in successive leaf sections from the base to the tip of developing barley (Hordeum vulgare L.), maize (Zea mays L.), rye grass (Lolium perenne L.) and wheat (Triticum aestivium L.) leaves. The basal regions of the leaves had the lowest rates of fatty acid synthesis and accumulated smal...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00386815
更新日期:1978-01-01 00:00:00
abstract::Sieve tubes mediate the long-distance transport of nutrients and signals between source and sink organs of plants. To detect mobile phloem proteins that are differentially distributed in source and sink organs of Cucurbita maxima, we used both one-dimensional gel electrophoresis (SDS-PAGE) and matrix-assisted laser de...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250050525
更新日期:1999-02-01 00:00:00
abstract::Primary roots of maize (Zea mays L.) and pea (Pisum sativum L.) exhibit strong positive gravitropism. In both species, gravistimulation induces polar movement of calcium across the root tip from the upper side to the lower side. Roots of onion (Allium cepa L.) are not responsive to gravity and gravistimulation induc...
journal_title:Planta
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
abstract::The inactivation temperature for Hill activity and for the long-lived delayed fluorescence of isolated Pisum sativum L. chloroplasts was found to depend on pH, the maximal value being in the pH region 5-7. Salts increase the inactivation temperature by 4-7°C. Effects of D2O and some other substances that modify the th...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/BF00402854
更新日期:1984-03-01 00:00:00
abstract::Glycosyltransferase complexes are known to be involved in plant cell wall biosynthesis, as for example in cellulose. It is not known to what extent such complexes are involved in biosynthesis of pectin as well. To address this question, work was initiated on ARAD1 (ARABINAN DEFICIENT 1) and its close homolog ARAD2 of ...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-012-1592-3
更新日期:2012-07-01 00:00:00
abstract::Physiological data from extreme habitat organisms during stresses are vital information for comprehending their survival. The intertidal seaweeds are exposed to a combination of environmental stresses, the most influential one being regular dehydration and re-hydration. Porphyra katadai var. hemiphylla is a unique int...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-008-0874-2
更新日期:2009-03-01 00:00:00
abstract::Ethylene responsive factors (ERFs) are important plant-specific transcription factors, some of which have been demonstrated to interact with the ethylene-responsive GCC box and the dehydration-responsive element (DRE); however, data on the roles of ERF proteins in connection with various signaling pathways are limited...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-004-1347-x
更新日期:2004-12-01 00:00:00
abstract::The tomato (Lycopersicon esculentum Mill.) endo-beta-1,4-glucanase (EGase) Cel1 protein was characterized in fruit using specific antibodies. Two polypeptides ranging between 51 and 52 kDa were detected in the pericarp, and polypeptides ranging between 49 and 51 kDa were detected in locules. The polypeptides recognize...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-004-1321-7
更新日期:2004-11-01 00:00:00
abstract::Xyloglucans were isolated by sequential extraction of the cell walls of pea (Pisum sativum L. cv. Alaska) with a xyloglucan-specific endoglucanase and KOH. The xyloglucan content and xyloglucan-oligosaccharide composition were determined for fractions obtained from the elongating and non-elongating segments of pea ste...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s004250000448
更新日期:2001-04-01 00:00:00
abstract::A polyclonal antibody has been raised against ferulic acid ester linked to arabinoxylans (AX). 5-O-feruloyl-alpha-L-arabinofuranosyl(1-->4)-beta-D-xylopyranosyl was obtained by chemical synthesis, and was coupled to bovine serum albumin for the immunization of rabbit. The polyclonal antibody designated 5-O-Fer-Ara was...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-006-0422-x
更新日期:2007-04-01 00:00:00
abstract:MAIN CONCLUSION:This study showed that an R2R3-MYB transcription factor, AgMYB2, functions in anthocyanin biosynthesis and accumulation in purple celery. Anthocyanins are involved in tissue coloration and stress response in plants. Foods containing high anthocyanin content are also beneficial to human health. Purple ce...
journal_title:Planta
pub_type: 杂志文章
doi:10.1007/s00425-018-2977-8
更新日期:2018-11-01 00:00:00