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1.
The mannose-specific GNA (Galanthus nivalis agglutinin, snowdrop lectin) are the resistant proteins with many bioactivities. Snowdrop lectin is different with plant organs and development periods in lectin species, content, and bioactivities. It is an effective and cheap way to obtain much active GNA through overexpression of GNA gene in Escherichia coli. Constructs encoding mature GNA fused with an N-terminal pelB signal sequence protein (PelB) were expressed in E. coli with high efficiency. Recombinant protein productivity was higher than values published before. The insecticidal activity of purified recombinant proteins was assayed on feeding sugarcane wooly aphid (Ceratovacuna lanigera Zehntner), as well as spraying on sugarcane plants infected by aphids. The insecticidal activity was found to be comparable to native GNA. Oral delivery has obvious positive implications for crop protection against insect pests since peptides can be present in, or sprayed on, plant tissues susceptible to damage. A highly efficient expression of functional recombinant GNA would decrease the cost of GNA and promote its wide use, especially to give crop protection in the field. 相似文献
2.
A novel lipid transfer protein from the dill Anethum graveolens L.: isolation,structure, heterologous expression,and functional characteristics 下载免费PDF全文
Daria N. Melnikova Konstantin S. Mineev Ekaterina I. Finkina Alexander S. Arseniev Tatiana V. Ovchinnikova 《Journal of peptide science》2016,22(1):59-66
A novel lipid transfer protein, designated as Ag‐LTP, was isolated from aerial parts of the dill Anethum graveolens L. Structural, antimicrobial, and lipid binding properties of the protein were studied. Complete amino acid sequence of Ag‐LTP was determined. The protein has molecular mass of 9524.4 Da, consists of 93 amino acid residues including eight cysteines forming four disulfide bonds. The recombinant Ag‐LTP was overexpressed in Escherichia coli and purified. NMR investigation shows that the Ag‐LTP spatial structure contains four α ‐helices, forming the internal hydrophobic cavity, and a long C‐terminal tail. The measured volume of the Ag‐LTP hydrophobic cavity is equal to ~800 A3, which is much larger than those of other plant LTP1s. Ag‐LTP has weak antifungal activity and unpronounced lipid binding specificity but effectively binds plant hormone jasmonic acid. Our results afford further molecular insight into biological functions of LTP in plants. Copyright © 2015 European Peptide Society and John Wiley & Sons, Ltd. 相似文献
3.
Xiaodan Li Bing Xia Yumei Jiang Qingsong Wu Chunyan Wang Lisi He Feng Peng Ren Wang 《Molecular biology reports》2010,37(2):995-1001
A new Lycoris radiata pathogenesis-related (PR)-4 gene, LrPR4 was isolated. LrPR4 encodes a 142 amino acid protein with a predicted molecular mass of 15.43 kDa and pI of 7.56. The putative LrPR4 shows high
similarity to PR4 type proteins from various plant species and belongs to the Barwin family. Like other PR4s from monocot
plants, LrPR4 protein contains a conserved Barwin domain and has a signal peptide at its N-terminus. The recombinant LrPR4
protein expressed in Escherichia coli showed activity towards hydrolysing RNA from L. radiata bulbs and antifungal activity. The results of this study suggest that LrPR4 may play a role in the disease resistance responses
of plant against pathogen attacks though its antifungal activity. 相似文献
4.
Furukawa T Kimura S Ishibashi T Mori Y Hashimoto J Sakaguchi K 《Plant molecular biology》2003,51(1):59-70
A novel endonuclease, a new member of the RAD2 nuclease family, has been identified from the higher plant, rice (Oryza sativa L. cv. Nipponbare), and designated as OsSEND-1. The open reading frame of the OsSEND-1 cDNA encoded a predicted product of 641 amino acid residues with a molecular weight of 69.9 kDa. The encoded protein showed a relatively high degree of sequence homology with the RAD2 nuclease family proteins, especially RAD2 nuclease, but it differed markedly from FEN-1, XPG or HEX1/EXO1. The N- and I-domains in the family were highly conserved in the OsSEND-1 sequence. The protein was much smaller than XPG, but larger than HEX1/EXO1 and FEN-1. The genome sequence was composed of 14 exons, and was localized at the almost terminal region of the short arm of chromosome 8. Northern blotting and in situ hybridization analyses demonstrated preferential expression of OsSEND-1 mRNA in proliferating tissues such as meristem. The mRNA level of OsSEND-1 was induced by UV and DNA-damaging agent such as MMS or H2O2, indicating that OsSEND-1 has some roles in the repair of many types of damaged DNA. The recombinant peptide showed endonuclease activity. 相似文献
5.
L. E. SCHRADER D. A. CATALOG D. M. PETERSON R. D. VOGELZANG 《Physiologia plantarum》1974,32(4):337-341
Lea fage influences the level of activity and the decay rate of the enzymes nitrate reductase (NR: E.C. 1.6.6.1) and glucose-6-phosphate dehydrogenase (G6PD; E.C. 1.1.1.49) extracted with and without protein in the extraction media. Such influence was determined in three plant species: corn (Zea mays L.), oats (Arena sativa L.), and tobacco (Nicotiana tabacum L.). Leaves of different ages were obtained from plants of various ages, or by removal of leaf blades from different positions on a single shoot. NR activity (per g fresh weight) declined as leaves of these plant species became older, especially when extraction was effected with conventional media (i.e. without added protein). The instability of NR in these extracts increased as leaves became older. Decay of NR in vitro was exponential with time. Addition of protein [3 %(w/v) casein or bovine serum albumin] to extraction media markedly increased the level of NR activity and its stability, especially in older leaves of all three plant species. Addition of protein did not affect the level of G6PD extracted from corn leaf blades, but slightly enhanced its activity in extracts from the oldest leaf blade of oats. G6PD activity also declined as leaf blades of corn and oats became older. 相似文献
6.
A cDNA clone for ascorbate oxidase (AAO) has been isolated from a cDNA library of tobacco (Nicotiana tabacum) cells. The identity of the amino acid sequence deduced from tobacco AAO cDNA to that from pumpkin AAO cDNA was 68%, which was much lower than the identity (80%) between pumpkin and cucumber AAO. AAO activity in tobacco cells was much lower than that in pumpkin cells, whereas the immunoreactive protein in tobacco cells was more abundant than that in pumpkin cells. We suppose that AAO protein in tobacco cells may be less active than that in pumpkin cells. Genomic Southern blotting suggested that AAO in tobacco was encoded by a single-copy gene. Northern blotting revealed that mRNA of AAO was highly expressed in young and growing tissues of tobacco plant. 相似文献
7.
8.
The contribution of leaching to the rapid release of nutrients and carbon in the early decay of wetland vegetation 总被引:2,自引:1,他引:1
Our goal was to quantify the coupled process of litter turnover and leaching as a source of nutrients and fixed carbon in
oligotrophic, nutrient-limited wetlands. We conducted poisoned and non-poisoned incubations of leaf material from four different
perennial wetland plants (Eleocharis spp., Cladium jamaicense, Rhizophora mangle and Spartina alterniflora) collected from different oligotrophic freshwater and estuarine wetland settings. Total phosphorus (TP) release from the
P-limited Everglades plant species (Eleocharis spp., C. jamaicense and R. mangle) was much lower than TP release by the salt marsh plant S. alterniflora from N-limited North Inlet (SC). For most species and sampling times, total organic carbon (TOC) and TP leaching losses were
much greater in poisoned than non-poisoned treatments, likely as a result of epiphytic microbial activity. Therefore, a substantial
portion of the C and P leached from these wetland plant species was bio-available to microbial communities. Even the microbes
associated with S. alterniflora from N-limited North Inlet showed indications of P-limitation early in the leaching process, as P was removed from the water
column. Leaves of R. mangle released much more TOC per gram of litter than the other species, likely contributing to the greater waterborne [DOC] observed
by others in the mangrove ecotone of Everglades National Park. Between the two freshwater Everglades plants, C. jamaicense leached nearly twice as much P than Eleocharis spp. In scaling this to the landscape level, our observed leaching losses combined with higher litter production of C. jamaicense compared to Eleocharis spp. resulted in a substantially greater P leaching from plant litter to the water column and epiphytic microbes. In conclusion,
leaching of fresh plant litter can be an important autochthonous source of nutrients in freshwater and estuarine wetland ecosystems. 相似文献
9.
Presence of a high-affinity binding protein for N-acetylchitooligosaccharide (fragments of chitin) elicitor in the plasma membrane from rice leaf and root cells was shown by affinity labeling experiments with an 125I-labeled N-acetylchitooligosaccharide derivative. Binding studies also showed that binding site in the leaf cells has a high affinity to highly elicitor-active, larger chitin fragments but much lower or no affinity to less elicitor-active or elicitor-inactive oligosaccharides. The amount of the binding protein in the leaf cells was slightly smaller than that in the suspension-cultured cells but much larger compared to that in the root cells. These results indicate the possible- involvement of the elicitor binding protein in the perception of the elicitor signal in intact rice plant. 相似文献
10.
Antifungal activity of the ribosome‐inactivating protein BE27 from sugar beet (Beta vulgaris L.) against the green mould Penicillium digitatum 下载免费PDF全文
Lucía Citores Rosario Iglesias Carolina Gay José Miguel Ferreras 《Molecular Plant Pathology》2016,17(2):261-271
The ribosome‐inactivating protein BE27 from sugar beet (Beta vulgaris L.) leaves is an apoplastic protein induced by signalling compounds, such as hydrogen peroxide and salicylic acid, which has been reported to be involved in defence against viruses. Here, we report that, at a concentration much lower than that present in the apoplast, BE27 displays antifungal activity against the green mould Penicillium digitatum, a necrotrophic fungus that colonizes wounds and grows in the inter‐ and intracellular spaces of the tissues of several edible plants. BE27 is able to enter into the cytosol and kill fungal cells, thus arresting the growth of the fungus. The mechanism of action seems to involve ribosomal RNA (rRNA) N‐glycosylase activity on the sarcin–ricin loop of the major rRNA which inactivates irreversibly the fungal ribosomes, thus inhibiting protein synthesis. We compared the C‐terminus of the BE27 structure with antifungal plant defensins and hypothesize that a structural motif composed of an α‐helix and a β‐hairpin, similar to the γ‐core motif of defensins, might contribute to the specific interaction with the fungal plasma membranes, allowing the protein to enter into the cell. 相似文献
11.
Caspase-resistant VirD2 protein provides enhanced gene delivery and expression in plants 总被引:1,自引:0,他引:1
Reavy B Bagirova S Chichkova NV Fedoseeva SV Kim SH Vartapetian AB Taliansky ME 《Plant cell reports》2007,26(8):1215-1219
Agrobacterium tumefaciens VirD2 protein is one of the key elements of Agrobacterium-mediated plant transformation, a process of transfer of T-DNA sequence from the Agrobacterium tumour inducing plasmid into the nucleus of infected plant cells and its integration into the host genome. The VirD2 protein
has been shown to be a substrate for a plant caspase-like protease activity (PCLP) in tobacco. We demonstrate here that mutagenesis
of the VirD2 protein to prevent cleavage by PCLP increases the efficiency of reporter gene transfer and expression. These
results indicate that PCLP cleavage of the Agrobacterium VirD2 protein acts to limit the effectiveness of T-DNA transfer and is a novel resistance mechanism that plants utilise to
combat Agrobacterium infection.
Brian Reavy and Svetlana Bagirova contributed equally to this work. 相似文献
12.
Using phragmoplastin-interacting protein 1 (PhrIP1) as bait, we isolated an Arabidopsis cDNA encoding Ran2, a small Ras-like GTP-binding protein. The interaction between PhrIP1 and Ran2 was confirmed by an in
vitro protein–protein interaction assay with purified Ran2 and PhrIP1. The plant Ran2 shares high sequence homology, 78 and
86% at the amino acid level, with human Ran/TC4 and C.
elegans Ran, respectively. Our results obtained from enzyme assays and Western blot analysis show that Ran2 has intrinsic GTPase
activity and is present in the soluble fraction of Arabidopsis seedling extract. Fluorescent microscopy using anti-Ran2 antibody revealed that the Ran protein is localized in the perinuclear
region with the highest concentration at the nuclear envelope. In contrast to its animal counterparts that are present in
the nucleoplasm, the Ran protein is absent inside the nucleus. These results suggest that plant Ran proteins may be involved
in mediation of nucleocytoplasmic transport and assembly of the nuclear envelope after karyokinesis in plant cells. 相似文献
13.
Ahmed M. Abd‐ElGawad Abdelsamed I. Elshamy Abd El‐NasserElGendy Saud L. Al‐Rowaily Abdulaziz M. Assaeed 《化学与生物多样性》2019,16(8)
Using synthetic chemicals in industry and agriculture has led to several environmental problems. Thus, plant products derived from volatile oils (VOs) could be a potential green source for bioherbicides. Little is known about the VOs of Lactuca serriola. Hence, the present study aimed to characterize the VOs chemical composition from the aerial parts of L. serriola, assessment of antioxidant activity, and evaluate allelopathic potential against the noxious weed Bidens pilosa. The VOs were extracted by hydrodistillation and analyzed by GC/MS. The VOs from the Egyptian ecospecies of L. serriola were found to comprise 34 compounds mainly oxygenated sesquiterpenes and diterpenes. The major compounds were isoshyobunone (64.22 %), isocembrol (17.35 %), and alloaromadendrene oxide‐1 (7.32 %). So, L. serriola can be considered as a good source for isoshyobunone, considering that it has a much higher concentration than any other plants. Also, this plant has a high content of the oxygenated diterpene compound, isocembrol, which is rarely found in the VOs of most plants. The VOs expressed strong antioxidant activity. Also, for the first time, our results showed a strong allelopathic activity of VOs from L. serriola on germination and seedling growth of the noxious weed, B. pilosa. We suppose that the activity of the VOs from L. serriola could be attributed to these previously mentioned major compounds, as they represent about 89 % of the total identified oil constituents. Nevertheless, to evaluate these compounds as new allelochemicals, further study is needed to test the allelopathic activity of authenticated standard of these compounds either singular or in combination on several weeds as well as evaluate the safety, and improve the efficacy and stability at the field scale. 相似文献
14.
Sabina Janicka Kristina Kühn Monique Le Ret Geraldine Bonnard Patrice Imbault Halina Augustyniak José M. Gualberto 《The Plant journal : for cell and molecular biology》2012,72(3):423-435
The plant mitochondrial DNA‐binding protein ODB1 was identified from a mitochondrial extract after DNA‐affinity purification. ODB1 (organellar DNA‐binding protein 1) co‐purified with WHY2, a mitochondrial member of the WHIRLY family of plant‐specific proteins involved in the repair of organellar DNA. The Arabidopsis thaliana ODB1 gene is identical to RAD52‐1, which encodes a protein functioning in homologous recombination in the nucleus but additionally localizing to mitochondria. We confirmed the mitochondrial localization of ODB1 by in vitro and in vivo import assays, as well as by immunodetection on Arabidopsis subcellular fractions. In mitochondria, WHY2 and ODB1 were found in large nucleo‐protein complexes. Both proteins co‐immunoprecipitated in a DNA‐dependent manner. In vitro assays confirmed DNA binding by ODB1 and showed that the protein has higher affinity for single‐stranded than for double‐stranded DNA. ODB1 showed no sequence specificity in vitro. In vivo, DNA co‐immunoprecipitation indicated that ODB1 binds sequences throughout the mitochondrial genome. ODB1 promoted annealing of complementary DNA sequences, suggesting a RAD52‐like function as a recombination mediator. Arabidopsis odb1 mutants were morphologically indistinguishable from the wild‐type, but following DNA damage by genotoxic stress, they showed reduced mitochondrial homologous recombination activity. Under the same conditions, the odb1 mutants showed an increase in illegitimate repair bypasses generated by microhomology‐mediated recombination. These observations identify ODB1 as a further component of homologous recombination‐dependent DNA repair in plant mitochondria. 相似文献
15.
M. C. Nardi E. Giacomelli P. Dainese A.-C. Fitchette-Lain L. Faye B. Baldan L. Navazio P. Mariani 《Plant biology (Stuttgart, Germany)》1998,111(1):66-70
Calreticulin, the main Ca2+ binding protein in the endoplasmic reticulum of eukaryotic cells, was characterized in Ginkgo biloba L. pollen and seeds. Electrophoretic analysis of the partly purified extracts showed the presence of two protein bands of 57 and 50kDa apparent molecular masses, which strongly cross-reacted with antibodies against plant calreticulins. Amino acid sequence comparison with other plant and animal calreticulins revealed a much higher similarity of the N-terminus of Ginkgo calreticulins with the homologue from angiosperms rather than with that from mammals. The finding of calreticulin in Ginkgo is indicative of the conservation also in gymnosperms of Ca2+ homeostatic mechanisms, which seem to rely on the same molecular components as all eukaryotic cells. 相似文献
16.
17.
Gregg W. Silk Benjamin F. Matthews David a. Somers Burle G. Gengenbach 《Plant molecular biology》1994,26(3):989-993
The rate-limiting step in the pathway for lysine synthesis in plants is catalyzed by the enzyme dihydrodipicolinate synthase (DS). We have cloned the portion of the soybean (Glycine max cv. Century) DapA cDNA that encodes the mature DS protein. Expression of the cloned soybean cDNA as a lacZ fusion protein was selected in a dapA
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Escherichia coli auxotroph. The DS activity of the fusion protein was characterized in E. coli extracts. The DS activity of the fusion protein was inhibited by lysine concentrations that also inhibited native soybean DS, while E. coli DS activity was much less sensitive to inhibition by lysine. 相似文献
18.
Gerszberg A Wiktorek-Smagur A Hnatuszko-Konka K Łuchniak P Kononowicz AK 《World journal of microbiology & biotechnology》2012,28(3):1115-1123
One of the most dynamically developing sectors of green biotechnology is molecular farming using transgenic plants as natural
bioreactors for the large scale production of recombinant proteins with biopharmaceutical and therapeutic values. Such properties
are characteristic of certain proteins of bacterial origin, including staphylokinase. For many years, work has been carried
out on the use of this protein in thrombolytic therapy. In this study, transgenic Solanum tuberosum plants expressing a CaMV::sak-mgpf-gusA gene fusion, were obtained. AGL1 A. tumefaciens strain was used in the process of transformation. The presence of the staphylokinase gene was confirmed by PCR in 22.5% of
the investigated plants. The expression of the fusion transgene was detected using the β-glucuronidase activity assay in 32 putative transgenic plants. Furthermore, on the basis of the GUS histochemical reaction,
the transgene expression pattern had a strong, constitutive character in seven of the transformants. The polyacrylamide gel
electrophoresis of a protein extract from the SAK/PCR-positive plants, revealed the presence of a119 kDa protein that corresponds
to that of the fusion protein SAK-mGFP-GUSA. Western blot analysis, using an antibody against staphylokinase, showed the presence
of the staphylokinase domain in the 119 kDa protein in six analyzed transformants. However, the enzymatic test revealed amidolytic
activity characteristic of staphylokinase in the protein extract of only one plant. This is the first report on a Solanum tuberosum plant producing a recombinant staphylokinase protein, a plasminogen activator of bacterial origin. 相似文献
19.
茶树中富含茶氨酸、儿茶素和咖啡碱等重要功能成分,具有较高的价值功效,茶树在生命周期中经常遭受逆境胁迫,维生素B6(VB6)在植物体内参与逆境应答,吡哆醛激酶(pyridoxal kinase,PLK)是VB6补救途径中的关键酶。为进一步了解PLK在茶树生物合成中的功能和作用机理,该研究基于茶树基因组数据库,以龙井43为材料,采用逆转录PCR(RT-PCR)的方法从茶树中克隆出CsPLK的基因。结果表明:该基因序列长为1 179 bp,编码393个氨基酸; CsPLK蛋白和已知物种中PLK蛋白具有较高的同源性,都是核糖激酶超家族成员;通过构建pET-CsPLK载体进行原核表达,并鉴定出重组蛋白有很强的催化活性;组织表达特异性分析表明,叶中的表达量比茎、根的高,在根中最低;荧光定量PCR表示,低温诱导CsPLK上调表达,干旱诱导CsPLK下调表达,发现该基因在茶树中有明显的逆境应答,推测CsPLK在茶树的生长发育、逆境胁迫发挥重要作用。 相似文献
20.
Infection by Cuscuta and Orobanche causes significant losses in dry solids and protein content in host plant or plant part. Changes occur in phosphatase activity towards fructose-1,6-diphosphate at alkaline pH and β-glycerophosphate at acid pH, expressed per mg protein or g fresh tissue. The leaves of all hosts infected by Orobanche show an increase in the alkaline fructosediphosphatase activity, whereas as far as the infection by Cuscuta is concerned the general response is a decrease in the enzyme in the shoots. The alterations in the phosphatase activity towards β-glycerophosphate at acid pH in the shoots are not consistent. However, there is a marked increase in the acid phosphatase activity against β-glycerophosphatase in the roots of the infected hosts. The significance of these findings has been discussed in the light of host-parasite interrelationship. 相似文献