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  1. AU="Chiang, Angela"
  2. AU="Balvert, Willemien"
  3. AU="Matic, Nancy"
  4. AU="Cerqueira, Rui"
  5. AU="Greco, Massimiliano"
  6. AU="Dalton, Michelle"
  7. AU="Letard, Sébastien"
  8. AU="Di Gangi, Iole Maria"
  9. AU="Chen, T T"
  10. AU="Alves, Luiz Felipe M F"
  11. AU="Liao, Jing" AU="Liao, Jing"

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  1. Artikel ; Online: Figuring out the enemy.

    Chiang, Angela F

    International journal of psychiatry in medicine

    2018  Band 55, Heft 1, Seite(n) 42–46

    Sprache Englisch
    Erscheinungsdatum 2018-08-06
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 220669-9
    ISSN 1541-3527 ; 0091-2174
    ISSN (online) 1541-3527
    ISSN 0091-2174
    DOI 10.1177/0091217418791450
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Transcriptome features of stone cell development in weevil-resistant and susceptible Sitka spruce.

    Whitehill, Justin G A / Yuen, Macaire M S / Chiang, Angela / Ritland, Carol E / Bohlmann, Jörg

    The New phytologist

    2023  Band 239, Heft 6, Seite(n) 2138–2152

    Abstract: Stone cells are a specialized, highly lignified cell type found in both angiosperms and gymnosperms. In conifers, abundance of stone cells in the cortex provides a robust constitutive physical defense against stem feeding insects. Stone cells are a major ...

    Abstract Stone cells are a specialized, highly lignified cell type found in both angiosperms and gymnosperms. In conifers, abundance of stone cells in the cortex provides a robust constitutive physical defense against stem feeding insects. Stone cells are a major insect-resistance trait in Sitka spruce (Picea sitchensis), occurring in dense clusters in apical shoots of trees resistant (R) to spruce weevil (Pissodes strobi) but being rare in susceptible (S) trees. To learn more about molecular mechanisms of stone cell formation in conifers, we used laser microdissection and RNA sequencing to develop cell-type-specific transcriptomes of developing stone cells from R and S trees. Using light, immunohistochemical, and fluorescence microscopy, we also visualized the deposition of cellulose, xylan, and lignin associated with stone cell development. A total of 1293 genes were differentially expressed at higher levels in developing stone cells relative to cortical parenchyma. Genes with potential roles in stone cell secondary cell wall formation (SCW) were identified and their expression evaluated over a time course of stone cell formation in R and S trees. The expression of several transcriptional regulators was associated with stone cell formation, including a NAC family transcription factor and several genes annotated as MYB transcription factors with known roles in SCW formation.
    Mesh-Begriff(e) Animals ; Transcriptome/genetics ; Weevils ; Picea/genetics ; Phenotype ; Insecta ; Gene Expression Regulation, Plant
    Sprache Englisch
    Erscheinungsdatum 2023-07-04
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.19103
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel ; Online: Transcriptome features of stone cell development in weevil‐resistant and susceptible Sitka spruce

    Whitehill, Justin G. A. / Yuen, Macaire M. S. / Chiang, Angela / Ritland, Carol E. / Bohlmann, Jörg

    New Phytologist. 2023 Sept., v. 239, no. 6 p.2138-2152

    2023  

    Abstract: Stone cells are a specialized, highly lignified cell type found in both angiosperms and gymnosperms. In conifers, abundance of stone cells in the cortex provides a robust constitutive physical defense against stem feeding insects. Stone cells are a major ...

    Abstract Stone cells are a specialized, highly lignified cell type found in both angiosperms and gymnosperms. In conifers, abundance of stone cells in the cortex provides a robust constitutive physical defense against stem feeding insects. Stone cells are a major insect‐resistance trait in Sitka spruce (Picea sitchensis), occurring in dense clusters in apical shoots of trees resistant (R) to spruce weevil (Pissodes strobi) but being rare in susceptible (S) trees. To learn more about molecular mechanisms of stone cell formation in conifers, we used laser microdissection and RNA sequencing to develop cell‐type‐specific transcriptomes of developing stone cells from R and S trees. Using light, immunohistochemical, and fluorescence microscopy, we also visualized the deposition of cellulose, xylan, and lignin associated with stone cell development. A total of 1293 genes were differentially expressed at higher levels in developing stone cells relative to cortical parenchyma. Genes with potential roles in stone cell secondary cell wall formation (SCW) were identified and their expression evaluated over a time course of stone cell formation in R and S trees. The expression of several transcriptional regulators was associated with stone cell formation, including a NAC family transcription factor and several genes annotated as MYB transcription factors with known roles in SCW formation.
    Schlagwörter Picea sitchensis ; Pissodes strobi ; RNA ; cell walls ; cellulose ; cortex ; fluorescence microscopy ; immunohistochemistry ; lignin ; microdissection ; transcription (genetics) ; transcription factors ; transcriptome ; xylan
    Sprache Englisch
    Erscheinungsverlauf 2023-09
    Umfang p. 2138-2152.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel ; Online
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 208885-x
    ISSN 1469-8137 ; 0028-646X
    ISSN (online) 1469-8137
    ISSN 0028-646X
    DOI 10.1111/nph.19103
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  4. Artikel: A case of cutaneous metastasis mimicking herpes zoster rash.

    Chiang, Angela / Salomon, Nadim / Gaikwad, Rahul / Kirshner, Jonathan

    IDCases

    2018  Band 12, Seite(n) 167–168

    Abstract: Cutaneous metastasis is a rare occurrence and often is confused with infectious etiology most commonly herpes zoster rash. We present a case 49 year old male with history of metastatic colon cancer with persistent dermatomal vesicular rash that thought ... ...

    Abstract Cutaneous metastasis is a rare occurrence and often is confused with infectious etiology most commonly herpes zoster rash. We present a case 49 year old male with history of metastatic colon cancer with persistent dermatomal vesicular rash that thought to be due to herpes zoster. A skin biopsy eventually revealed malignant cells.
    Sprache Englisch
    Erscheinungsdatum 2018-05-18
    Erscheinungsland Netherlands
    Dokumenttyp Journal Article ; Case Reports
    ZDB-ID 2745454-X
    ISSN 2214-2509
    ISSN 2214-2509
    DOI 10.1016/j.idcr.2018.05.002
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel ; Online: A nasal mass discovered during intubation. Schwannoma.

    Chiang, Angela F / Isaiah, Amal / Vakharia, Kalpesh T

    JAMA otolaryngology-- head & neck surgery

    2015  Band 141, Heft 1, Seite(n) 87–88

    Mesh-Begriff(e) Humans ; Magnetic Resonance Imaging ; Male ; Middle Aged ; Nasal Obstruction/diagnosis ; Neurilemmoma/diagnosis ; Nose Neoplasms/diagnosis
    Sprache Englisch
    Erscheinungsdatum 2015-01
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2701825-8
    ISSN 2168-619X ; 2168-6181
    ISSN (online) 2168-619X
    ISSN 2168-6181
    DOI 10.1001/jamaoto.2014.2820
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  6. Artikel ; Online: Cell-type- and tissue-specific transcriptomes of the white spruce (Picea glauca) bark unmask fine-scale spatial patterns of constitutive and induced conifer defense.

    Celedon, Jose M / Yuen, Macaire M S / Chiang, Angela / Henderson, Hannah / Reid, Karen E / Bohlmann, Jörg

    The Plant journal : for cell and molecular biology

    2017  Band 92, Heft 4, Seite(n) 710–726

    Abstract: Plant defenses often involve specialized cells and tissues. In conifers, specialized cells of the bark are important for defense against insects and pathogens. Using laser microdissection, we characterized the transcriptomes of cortical resin duct cells, ...

    Abstract Plant defenses often involve specialized cells and tissues. In conifers, specialized cells of the bark are important for defense against insects and pathogens. Using laser microdissection, we characterized the transcriptomes of cortical resin duct cells, phenolic cells and phloem of white spruce (Picea glauca) bark under constitutive and methyl jasmonate (MeJa)-induced conditions, and we compared these transcriptomes with the transcriptome of the bark tissue complex. Overall, ~3700 bark transcripts were differentially expressed in response to MeJa. Approximately 25% of transcripts were expressed in only one cell type, revealing cell specialization at the transcriptome level. MeJa caused cell-type-specific transcriptome responses and changed the overall patterns of cell-type-specific transcript accumulation. Comparison of transcriptomes of the conifer bark tissue complex and specialized cells resolved a masking effect inherent to transcriptome analysis of complex tissues, and showed the actual cell-type-specific transcriptome signatures. Characterization of cell-type-specific transcriptomes is critical to reveal the dynamic patterns of spatial and temporal display of constitutive and induced defense systems in a complex plant tissue or organ. This was demonstrated with the improved resolution of spatially restricted expression of sets of genes of secondary metabolism in the specialized cell types.
    Sprache Englisch
    Erscheinungsdatum 2017-11
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1088037-9
    ISSN 1365-313X ; 0960-7412
    ISSN (online) 1365-313X
    ISSN 0960-7412
    DOI 10.1111/tpj.13673
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  7. Artikel: Mutational analysis of white spruce (Picea glauca) ent-kaurene synthase (PgKS) reveals common and distinct mechanisms of conifer diterpene synthases of general and specialized metabolism

    Zerbe, Philipp / Chiang, Angela / Bohlmann, Jörg

    Phytochemistry. 2012 Feb., v. 74

    2012  

    Abstract: Conifer diterpene synthases (diTPSs) catalyze the multi-step cycloisomerization of geranylgeranyl diphosphate, or copalyl diphosphate, to a variety of diterpenes in general (i.e., primary) and specialized (i.e., secondary) metabolism. Despite their ... ...

    Abstract Conifer diterpene synthases (diTPSs) catalyze the multi-step cycloisomerization of geranylgeranyl diphosphate, or copalyl diphosphate, to a variety of diterpenes in general (i.e., primary) and specialized (i.e., secondary) metabolism. Despite their functional diversity, the known conifer diTPSs are structurally closely related, with variations in three conserved domains, α, β and γ. The catalytic specificity of conifer class I and class I/II diTPSs is predominantly determined by the protein environment of the C-terminal class I active site through stabilization of common and unique carbocation intermediates. Using the crystal structure of Taxus brevifolia taxadiene synthase as template, comparative modeling and mutagenesis of the class I diTPS ent-kaurene synthase from Picea glauca (PgKS) was performed to elucidate the catalytic specificity of PgKS relative to spruce diTPSs of specialized metabolism. N-terminal truncations demonstrated a role for the βγ domain in class I enzyme activity for PgKS, facilitating the closure of the class I active site upon substrate binding. Based on position, Arg476 and Asp736 in the C-terminal α domain of PgKS may contribute to this conformational transition and appear critical for catalysis. Consistent with the mechanism of other diTPSs, the subsequent ionization of a copalyl diphosphate substrate and coordination of the diphosphate group is controlled by strictly conserved residues in the DDxxD and NDIQGCKRE motif of PgKS, such as Asn656 and Arg653. Furthermore, Lys478, Trp502, Met588, Ala615 and Ile619 control the enzymatic activity and specificity of PgKS via carbocation stabilization en route to ent-kaurene. These positions show a high level of amino acid variation, consistent with functional plasticity among conifer diTPSs of different functions in general or specialized metabolism.
    Schlagwörter Picea glauca ; Taxus brevifolia ; active sites ; amino acids ; catalytic activity ; conifers ; crystal structure ; enzyme activity ; functional diversity ; ionization ; metabolism ; models ; mutagenesis ; proteins
    Sprache Englisch
    Erscheinungsverlauf 2012-02
    Umfang p. 30-39.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 208884-8
    ISSN 1873-3700 ; 0031-9422
    ISSN (online) 1873-3700
    ISSN 0031-9422
    DOI 10.1016/j.phytochem.2011.11.004
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  8. Artikel ; Online: Mutational analysis of white spruce (Picea glauca) ent-kaurene synthase (PgKS) reveals common and distinct mechanisms of conifer diterpene synthases of general and specialized metabolism.

    Zerbe, Philipp / Chiang, Angela / Bohlmann, Jörg

    Phytochemistry

    2012  Band 74, Seite(n) 30–39

    Abstract: Conifer diterpene synthases (diTPSs) catalyze the multi-step cycloisomerization of geranylgeranyl diphosphate, or copalyl diphosphate, to a variety of diterpenes in general (i.e., primary) and specialized (i.e., secondary) metabolism. Despite their ... ...

    Abstract Conifer diterpene synthases (diTPSs) catalyze the multi-step cycloisomerization of geranylgeranyl diphosphate, or copalyl diphosphate, to a variety of diterpenes in general (i.e., primary) and specialized (i.e., secondary) metabolism. Despite their functional diversity, the known conifer diTPSs are structurally closely related, with variations in three conserved domains, α, β and γ. The catalytic specificity of conifer class I and class I/II diTPSs is predominantly determined by the protein environment of the C-terminal class I active site through stabilization of common and unique carbocation intermediates. Using the crystal structure of Taxus brevifolia taxadiene synthase as template, comparative modeling and mutagenesis of the class I diTPS ent-kaurene synthase from Picea glauca (PgKS) was performed to elucidate the catalytic specificity of PgKS relative to spruce diTPSs of specialized metabolism. N-terminal truncations demonstrated a role for the βγ domain in class I enzyme activity for PgKS, facilitating the closure of the class I active site upon substrate binding. Based on position, Arg476 and Asp736 in the C-terminal α domain of PgKS may contribute to this conformational transition and appear critical for catalysis. Consistent with the mechanism of other diTPSs, the subsequent ionization of a copalyl diphosphate substrate and coordination of the diphosphate group is controlled by strictly conserved residues in the DDxxD and NDIQGCKRE motif of PgKS, such as Asn656 and Arg653. Furthermore, Lys478, Trp502, Met588, Ala615 and Ile619 control the enzymatic activity and specificity of PgKS via carbocation stabilization en route to ent-kaurene. These positions show a high level of amino acid variation, consistent with functional plasticity among conifer diTPSs of different functions in general or specialized metabolism.
    Mesh-Begriff(e) Alkyl and Aryl Transferases/chemistry ; Alkyl and Aryl Transferases/genetics ; Alkyl and Aryl Transferases/metabolism ; Amino Acid Sequence ; Binding Sites ; Diterpenes, Kaurane/biosynthesis ; Molecular Structure ; Mutation ; Organophosphates/metabolism ; Picea/enzymology ; Picea/genetics ; Picea/metabolism ; Plant Proteins/chemistry ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Protein Structure, Tertiary ; Taxus/genetics
    Chemische Substanzen Diterpenes, Kaurane ; Organophosphates ; Plant Proteins ; copalyl diphosphate ; kaurene (34424-57-2) ; Alkyl and Aryl Transferases (EC 2.5.-) ; ent-kaurene synthetase B (EC 2.5.1.-)
    Sprache Englisch
    Erscheinungsdatum 2012-02
    Erscheinungsland England
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208884-8
    ISSN 1873-3700 ; 0031-9422
    ISSN (online) 1873-3700
    ISSN 0031-9422
    DOI 10.1016/j.phytochem.2011.11.004
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  9. Artikel ; Online: Biosynthesis of the psychotropic plant diterpene salvinorin A: Discovery and characterization of the Salvia divinorum clerodienyl diphosphate synthase.

    Pelot, Kyle A / Mitchell, Rod / Kwon, Moonhyuk / Hagelthorn, Lynne M / Wardman, Jacob F / Chiang, Angela / Bohlmann, Jörg / Ro, Dae-Kyun / Zerbe, Philipp

    The Plant journal : for cell and molecular biology

    2017  Band 89, Heft 5, Seite(n) 885–897

    Abstract: Salvia divinorum commonly known as diviner's sage, is an ethnomedicinal plant of the mint family (Lamiaceae). Salvia divinorum is rich in clerodane-type diterpenoids, which accumulate predominantly in leaf glandular trichomes. The main bioactive ... ...

    Abstract Salvia divinorum commonly known as diviner's sage, is an ethnomedicinal plant of the mint family (Lamiaceae). Salvia divinorum is rich in clerodane-type diterpenoids, which accumulate predominantly in leaf glandular trichomes. The main bioactive metabolite, salvinorin A, is the first non-nitrogenous natural compound known to function as an opioid-receptor agonist, and is undergoing clinical trials for potential use in treating neuropsychiatric diseases and drug addictions. We report here the discovery and functional characterization of two S. divinorum diterpene synthases (diTPSs), the ent-copalyl diphosphate (ent-CPP) synthase SdCPS1, and the clerodienyl diphosphate (CLPP) synthase SdCPS2. Mining of leaf- and trichome-specific transcriptomes revealed five diTPSs, two of which are class II diTPSs (SdCPS1-2) and three are class I enzymes (SdKSL1-3). Of the class II diTPSs, transient expression in Nicotiana benthamiana identified SdCPS1 as an ent-CPP synthase, which is prevalent in roots and, together with SdKSL1, exhibits a possible dual role in general and specialized metabolism. In vivo co-expression and in vitro assays combined with nuclear magnetic resonance (NMR) analysis identified SdCPS2 as a CLPP synthase. A role of SdCPS2 in catalyzing the committed step in salvinorin A biosynthesis is supported by its biochemical function, trichome-specific expression and absence of additional class II diTPSs in S. divinorum. Structure-guided mutagenesis revealed four catalytic residues that enabled the re-programming of SdCPS2 activity to afford four distinct products, thus advancing our understanding of how neo-functionalization events have shaped the array of different class II diTPS functions in plants, and may promote synthetic biology platforms for a broader spectrum of diterpenoid bioproducts.
    Mesh-Begriff(e) Alkyl and Aryl Transferases/genetics ; Alkyl and Aryl Transferases/metabolism ; Biological Products/metabolism ; Diterpenes/metabolism ; Diterpenes, Clerodane/metabolism ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Salvia/enzymology ; Salvia/genetics ; Salvia/metabolism
    Chemische Substanzen Biological Products ; Diterpenes ; Diterpenes, Clerodane ; Plant Proteins ; Alkyl and Aryl Transferases (EC 2.5.-) ; salvinorin A (T56W91NG6J)
    Sprache Englisch
    Erscheinungsdatum 2017-02-06
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1088037-9
    ISSN 1365-313X ; 0960-7412
    ISSN (online) 1365-313X
    ISSN 0960-7412
    DOI 10.1111/tpj.13427
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  10. Artikel ; Online: Biosynthesis of wine aroma: transcript profiles of hydroxymethylbutenyl diphosphate reductase, geranyl diphosphate synthase, and linalool/nerolidol synthase parallel monoterpenol glycoside accumulation in Gewürztraminer grapes.

    Martin, Diane M / Chiang, Angela / Lund, Steven T / Bohlmann, Jörg

    Planta

    2012  Band 236, Heft 3, Seite(n) 919–929

    Abstract: In developing grapevine (Vitis vinifera L.) berries, precursor volatile organic compounds (PVOCs) are largely stored as glycosides which may be hydrolyzed to release VOCs during fruit ripening, wine making, or aging. VOCs can be further transformed by ... ...

    Abstract In developing grapevine (Vitis vinifera L.) berries, precursor volatile organic compounds (PVOCs) are largely stored as glycosides which may be hydrolyzed to release VOCs during fruit ripening, wine making, or aging. VOCs can be further transformed by yeast metabolism. Together, these processes contribute to complexity of wine aromas. Floral and citrus odors of many white wine varietals are attributed to monoterpenes and monoterpene alcohols, while phenolic compounds, norisoprenoids, and other volatiles also play important roles in determining aroma. We present an analysis of PVOCs stored as glycosides in developing Gewürztraminer berries during the growing season. We optimized a method for PVOC analysis suitable for small amounts of Muscat grapevine berries and showed that the amount of PVOCs dramatically increased during and after véraison. Transcript profiling of the same berry samples underscored the involvement of terpenoid pathway genes in the accumulation of PVOCs. The onset of monoterpenol PVOC accumulation in developing grapes was correlated with an increase of transcript abundances of early terpenoid pathway enzymes. Transcripts encoding the methylerythritol phosphate pathway gene 4-hydroxy-3-methylbut-2-enyl diphosphate reductase, as well as geraniol diphosphate synthase, were up-regulated preceding and during the increase in monoterpenol PVOCs. Transcripts for linalool/nerolidol synthase increased in later véraison stages.
    Mesh-Begriff(e) Alkyl and Aryl Transferases/metabolism ; Base Sequence ; Farnesyltranstransferase/chemistry ; Farnesyltranstransferase/metabolism ; Fruit/enzymology ; Fruit/growth & development ; Gene Expression Regulation, Developmental ; Gene Expression Regulation, Plant ; Genes, Plant ; Hydro-Lyases/chemistry ; Oxidoreductases/chemistry ; Oxidoreductases/metabolism ; Plant Growth Regulators/metabolism ; Sesquiterpenes/metabolism ; Transcription, Genetic ; Vitis/enzymology ; Vitis/genetics ; Volatile Organic Compounds/metabolism ; Wine
    Chemische Substanzen Plant Growth Regulators ; Sesquiterpenes ; Volatile Organic Compounds ; Oxidoreductases (EC 1.-) ; hydroxymethylbutenyl diphosphate reductase, Vitis vinifera (EC 1.-) ; Alkyl and Aryl Transferases (EC 2.5.-) ; terpene synthase (EC 2.5.1.-) ; Farnesyltranstransferase (EC 2.5.1.29) ; Hydro-Lyases (EC 4.2.1.-) ; S-linalool synthase (EC 4.2.1.-) ; nerolidol (QR6IP857S6)
    Sprache Englisch
    Erscheinungsdatum 2012-07-24
    Erscheinungsland Germany
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/s00425-012-1704-0
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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