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  1. Article ; Online: Systems biology: current status and challenges.

    Zupanic, Anze / Bernstein, Hans C / Heiland, Ines

    Cellular and molecular life sciences : CMLS

    2020  Volume 77, Issue 3, Page(s) 379–380

    Abstract: We put together a special issue on current approaches in systems biology with a focus on mathematical modeling of metabolic networks. Mathematical models have increasingly been used to unravel molecular mechanisms of complex dynamic biological processes. ...

    Abstract We put together a special issue on current approaches in systems biology with a focus on mathematical modeling of metabolic networks. Mathematical models have increasingly been used to unravel molecular mechanisms of complex dynamic biological processes. We here provide a short introduction into the topics covered in this special issue, highlighting current developments and challenges.
    MeSH term(s) Humans ; Metabolic Networks and Pathways/physiology ; Models, Theoretical ; Systems Biology/methods
    Language English
    Publishing date 2020-01-13
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 1358415-7
    ISSN 1420-9071 ; 1420-682X
    ISSN (online) 1420-9071
    ISSN 1420-682X
    DOI 10.1007/s00018-019-03410-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: The evolution of the plastid phosphate translocator family.

    Bockwoldt, Mathias / Heiland, Ines / Fischer, Karsten

    Planta

    2019  Volume 250, Issue 1, Page(s) 245–261

    Abstract: Main conclusion: The plastid phosphate translocators evolved in algae but diversified into several groups, which adopted different physiological functions by extensive gene duplications and losses in Streptophyta. The plastid phosphate translocators ( ... ...

    Abstract Main conclusion: The plastid phosphate translocators evolved in algae but diversified into several groups, which adopted different physiological functions by extensive gene duplications and losses in Streptophyta. The plastid phosphate translocators (pPT) are a family of transporters involved in the exchange of metabolites and inorganic phosphate between stroma and cytosol. Based on their substrate specificities, they were divided into four subfamilies named TPT, PPT, GPT and XPT. To analyse the occurrence of these transporters in different algae and land plant species, we identified 652 pPT genes in 101 sequenced genomes for phylogenetic analysis. The first three subfamilies are found in all species and evolved before the split of red and green algae while the XPTs were derived from the duplication of a GPT gene at the base of Streptophyta. The analysis of the intron-exon structures of the pPTs corroborated these findings. While the number and positions of introns are conserved within each subfamily, they differ between the subfamilies suggesting an insertion of the introns shortly after the three subfamilies evolved. During angiosperm evolution, the subfamilies further split into different groups (TPT1-2, PPT1-3, GPT1-6). Angiosperm species differ significantly in the total number of pPTs, with many species having only a few, while several plants, especially crops, have a higher number, pointing to the importance of these transporters for improved source-sink strength and yield. The differences in the number of pPTs can be explained by several small-scale gene duplications and losses in plant families or single species, but also by whole genome duplications, for example, in grasses. This work could be the basis for a comprehensive analysis of the molecular and physiological functions of this important family of transporters.
    MeSH term(s) Chromosome Mapping ; Evolution, Molecular ; Exons/genetics ; Gene Duplication ; Genome, Plant/genetics ; Introns/genetics ; Magnoliopsida/genetics ; Magnoliopsida/metabolism ; Membrane Transport Proteins/genetics ; Membrane Transport Proteins/metabolism ; Phosphates/metabolism ; Phylogeny ; Plant Proteins/genetics ; Plant Proteins/metabolism ; Plants/genetics ; Plants/metabolism ; Plastids/metabolism
    Chemical Substances Membrane Transport Proteins ; Phosphates ; Plant Proteins
    Language English
    Publishing date 2019-04-16
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/s00425-019-03161-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Welcome to the Family: Identification of the NAD

    Ziegler, Mathias / Monné, Magnus / Nikiforov, Andrey / Agrimi, Gennaro / Heiland, Ines / Palmieri, Ferdinando

    Biomolecules

    2021  Volume 11, Issue 6

    Abstract: Subcellular compartmentation is a fundamental property of eukaryotic cells. Communication and metabolic and regulatory interconnectivity between organelles require that solutes can be transported across their surrounding membranes. Indeed, in mammals, ... ...

    Abstract Subcellular compartmentation is a fundamental property of eukaryotic cells. Communication and metabolic and regulatory interconnectivity between organelles require that solutes can be transported across their surrounding membranes. Indeed, in mammals, there are hundreds of genes encoding solute carriers (SLCs) which mediate the selective transport of molecules such as nucleotides, amino acids, and sugars across biological membranes. Research over many years has identified the localization and preferred substrates of a large variety of SLCs. Of particular interest has been the SLC25 family, which includes carriers embedded in the inner membrane of mitochondria to secure the supply of these organelles with major metabolic intermediates and coenzymes. The substrate specificity of many of these carriers has been established in the past. However, the route by which animal mitochondria are supplied with NAD
    MeSH term(s) Biological Transport/genetics ; Humans ; Mitochondria/genetics ; Mitochondria/metabolism ; Mitochondrial Membrane Transport Proteins/genetics ; Mitochondrial Membrane Transport Proteins/metabolism ; NAD/genetics ; NAD/metabolism ; Solute Carrier Proteins/genetics ; Solute Carrier Proteins/metabolism
    Chemical Substances Mitochondrial Membrane Transport Proteins ; Solute Carrier Proteins ; NAD (0U46U6E8UK)
    Language English
    Publishing date 2021-06-14
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2701262-1
    ISSN 2218-273X ; 2218-273X
    ISSN (online) 2218-273X
    ISSN 2218-273X
    DOI 10.3390/biom11060880
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: Early Evolutionary Selection of NAD Biosynthesis Pathway in Bacteria.

    Sharma, Suraj / Hsieh, Yin-Chen / Dietze, Jörn / Bockwoldt, Mathias / Strømland, Øyvind / Ziegler, Mathias / Heiland, Ines

    Metabolites

    2022  Volume 12, Issue 7

    Abstract: Bacteria use two alternative pathways to synthesize nicotinamide adenine dinucleotide (NAD) from nicotinamide (Nam). A short, two-step route proceeds through nicotinamide mononucleotide (NMN) formation, whereas the other pathway, a four-step route, ... ...

    Abstract Bacteria use two alternative pathways to synthesize nicotinamide adenine dinucleotide (NAD) from nicotinamide (Nam). A short, two-step route proceeds through nicotinamide mononucleotide (NMN) formation, whereas the other pathway, a four-step route, includes the deamidation of Nam and the reamidation of nicotinic acid adenine dinucleotide (NAAD) to NAD. In addition to having twice as many enzymatic steps, the four-step route appears energetically unfavourable, because the amidation of NAAD includes the cleavage of ATP to AMP. Therefore, it is surprising that this pathway is prevalent not only in bacteria but also in yeast and plants. Here, we demonstrate that the considerably higher chemical stability of the deamidated intermediates, compared with their amidated counterparts, might compensate for the additional energy expenditure, at least at elevated temperatures. Moreover, comprehensive bioinformatics analyses of the available >6000 bacterial genomes indicate that an early selection of one or the other pathway occurred. The mathematical modelling of the NAD pathway dynamics supports this hypothesis, as there appear to be no advantages in having both pathways.
    Language English
    Publishing date 2022-06-21
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662251-8
    ISSN 2218-1989
    ISSN 2218-1989
    DOI 10.3390/metabo12070569
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Natural isotope correction improves analysis of protein modification dynamics.

    Dietze, Jörn / van Pijkeren, Alienke / Egger, Anna-Sophia / Ziegler, Mathias / Kwiatkowski, Marcel / Heiland, Ines

    Analytical and bioanalytical chemistry

    2021  Volume 413, Issue 30, Page(s) 7333–7340

    Abstract: Stable isotope labelling in combination with high-resolution mass spectrometry approaches are increasingly used to analyze both metabolite and protein modification dynamics. To enable correct estimation of the resulting dynamics, it is critical to ... ...

    Abstract Stable isotope labelling in combination with high-resolution mass spectrometry approaches are increasingly used to analyze both metabolite and protein modification dynamics. To enable correct estimation of the resulting dynamics, it is critical to correct the measured values for naturally occurring stable isotopes, a process commonly called isotopologue correction or deconvolution. While the importance of isotopologue correction is well recognized in metabolomics, it has received far less attention in proteomics approaches. Although several tools exist that enable isotopologue correction of mass spectrometry data, the majority is tailored for the analysis of low molecular weight metabolites. We here present PICor which has been developed for isotopologue correction of complex isotope labelling experiments in proteomics or metabolomics and demonstrate the importance of appropriate correction for accurate determination of protein modifications dynamics, using histone acetylation as an example.
    MeSH term(s) Acetyl Coenzyme A/analysis ; Acetylation ; Animals ; Chromatography, Liquid/methods ; HEK293 Cells ; Humans ; Isotope Labeling/methods ; Mice ; Molecular Weight ; Protein Processing, Post-Translational ; Proteins/chemistry ; Proteomics ; RAW 264.7 Cells ; Tandem Mass Spectrometry/methods
    Chemical Substances Proteins ; Acetyl Coenzyme A (72-89-9)
    Language English
    Publishing date 2021-10-27
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 201093-8
    ISSN 1618-2650 ; 0016-1152 ; 0372-7920
    ISSN (online) 1618-2650
    ISSN 0016-1152 ; 0372-7920
    DOI 10.1007/s00216-021-03732-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Dynamics of NAD-metabolism: everything but constant.

    Opitz, Christiane A / Heiland, Ines

    Biochemical Society transactions

    2015  Volume 43, Issue 6, Page(s) 1127–1132

    Abstract: NAD, as well as its phosphorylated form, NADP, are best known as electron carriers and co-substrates of various redox reactions. As such they participate in approximately one quarter of all reactions listed in the reaction database KEGG. In metabolic ... ...

    Abstract NAD, as well as its phosphorylated form, NADP, are best known as electron carriers and co-substrates of various redox reactions. As such they participate in approximately one quarter of all reactions listed in the reaction database KEGG. In metabolic pathway analysis, the total amount of NAD is usually assumed to be constant. That means that changes in the redox state might be considered, but concentration changes of the NAD moiety are usually neglected. However, a growing number of NAD-consuming reactions have been identified, showing that this assumption does not hold true in general. NAD-consuming reactions are common characteristics of NAD(+)-dependent signalling pathways and include mono- and poly-ADP-ribosylation of proteins, NAD(+)-dependent deacetylation by sirtuins and the formation of messenger molecules such as cyclic ADP-ribose (cADPR) and nicotinic acid (NA)-ADP (NAADP). NAD-consuming reactions are thus involved in major signalling and gene regulation pathways such as DNA-repair or regulation of enzymes central in metabolism. All known NAD(+)-dependent signalling processes include the release of nicotinamide (Nam). Thus cellular NAD pools need to be constantly replenished, mostly by recycling Nam to NAD(+). This process is, among others, regulated by the circadian clock, causing complex dynamic changes in NAD concentration. As disturbances in NAD homoeostasis are associated with a large number of diseases ranging from cancer to diabetes, it is important to better understand the dynamics of NAD metabolism to develop efficient pharmacological invention strategies to target this pathway.
    MeSH term(s) Acetylation ; Animals ; Biosynthetic Pathways ; Circadian Clocks/physiology ; Feedback, Physiological/physiology ; Humans ; Models, Biological ; NAD/metabolism ; Oxidation-Reduction ; Sirtuin 1/metabolism
    Chemical Substances NAD (0U46U6E8UK) ; Sirtuin 1 (EC 3.5.1.-)
    Language English
    Publishing date 2015-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 184237-7
    ISSN 1470-8752 ; 0300-5127
    ISSN (online) 1470-8752
    ISSN 0300-5127
    DOI 10.1042/BST20150133
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Natural isotope correction improves analysis of protein modification dynamics

    Dietze, Jörn / van Pijkeren, Alienke / Egger, Anna-Sophia / Ziegler, Mathias / Kwiatkowski, Marcel / Heiland, Ines

    Analytical and bioanalytical chemistry. 2021 Dec., v. 413, no. 30

    2021  

    Abstract: Stable isotope labelling in combination with high-resolution mass spectrometry approaches are increasingly used to analyze both metabolite and protein modification dynamics. To enable correct estimation of the resulting dynamics, it is critical to ... ...

    Abstract Stable isotope labelling in combination with high-resolution mass spectrometry approaches are increasingly used to analyze both metabolite and protein modification dynamics. To enable correct estimation of the resulting dynamics, it is critical to correct the measured values for naturally occurring stable isotopes, a process commonly called isotopologue correction or deconvolution. While the importance of isotopologue correction is well recognized in metabolomics, it has received far less attention in proteomics approaches. Although several tools exist that enable isotopologue correction of mass spectrometry data, the majority is tailored for the analysis of low molecular weight metabolites. We here present PICor which has been developed for isotopologue correction of complex isotope labelling experiments in proteomics or metabolomics and demonstrate the importance of appropriate correction for accurate determination of protein modifications dynamics, using histone acetylation as an example.
    Keywords acetylation ; analytical chemistry ; histones ; mass spectrometry ; metabolites ; metabolomics ; molecular weight ; proteomics ; stable isotopes
    Language English
    Dates of publication 2021-12
    Size p. 7333-7340.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ISSN 1618-2642
    DOI 10.1007/s00216-021-03732-7
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: The evolution of the plastid phosphate translocator family

    Bockwoldt, Mathias / Fischer, Karsten / Heiland, Ines

    Planta. 2019 July, v. 250, no. 1

    2019  

    Abstract: MAIN CONCLUSION: The plastid phosphate translocators evolved in algae but diversified into several groups, which adopted different physiological functions by extensive gene duplications and losses in Streptophyta. The plastid phosphate translocators (pPT) ...

    Abstract MAIN CONCLUSION: The plastid phosphate translocators evolved in algae but diversified into several groups, which adopted different physiological functions by extensive gene duplications and losses in Streptophyta. The plastid phosphate translocators (pPT) are a family of transporters involved in the exchange of metabolites and inorganic phosphate between stroma and cytosol. Based on their substrate specificities, they were divided into four subfamilies named TPT, PPT, GPT and XPT. To analyse the occurrence of these transporters in different algae and land plant species, we identified 652 pPT genes in 101 sequenced genomes for phylogenetic analysis. The first three subfamilies are found in all species and evolved before the split of red and green algae while the XPTs were derived from the duplication of a GPT gene at the base of Streptophyta. The analysis of the intron–exon structures of the pPTs corroborated these findings. While the number and positions of introns are conserved within each subfamily, they differ between the subfamilies suggesting an insertion of the introns shortly after the three subfamilies evolved. During angiosperm evolution, the subfamilies further split into different groups (TPT1-2, PPT1-3, GPT1-6). Angiosperm species differ significantly in the total number of pPTs, with many species having only a few, while several plants, especially crops, have a higher number, pointing to the importance of these transporters for improved source–sink strength and yield. The differences in the number of pPTs can be explained by several small-scale gene duplications and losses in plant families or single species, but also by whole genome duplications, for example, in grasses. This work could be the basis for a comprehensive analysis of the molecular and physiological functions of this important family of transporters.
    Keywords algae ; Angiospermae ; Chlorophyta ; crops ; cytosol ; gene duplication ; grasses ; introns ; metabolites ; phosphates ; phylogeny ; substrate specificity ; transporters
    Language English
    Dates of publication 2019-07
    Size p. 245-261.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 208909-9
    ISSN 1432-2048 ; 0032-0935 ; 1866-2749
    ISSN (online) 1432-2048
    ISSN 0032-0935 ; 1866-2749
    DOI 10.1007/s00425-019-03161-y
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Multi-scale modeling of drug binding kinetics to predict drug efficacy.

    Clarelli, Fabrizio / Liang, Jingyi / Martinecz, Antal / Heiland, Ines / Abel Zur Wiesch, Pia

    Cellular and molecular life sciences : CMLS

    2019  Volume 77, Issue 3, Page(s) 381–394

    Abstract: Optimizing drug therapies for any disease requires a solid understanding of pharmacokinetics (the drug concentration at a given time point in different body compartments) and pharmacodynamics (the effect a drug has at a given concentration). Mathematical ...

    Abstract Optimizing drug therapies for any disease requires a solid understanding of pharmacokinetics (the drug concentration at a given time point in different body compartments) and pharmacodynamics (the effect a drug has at a given concentration). Mathematical models are frequently used to infer drug concentrations over time based on infrequent sampling and/or in inaccessible body compartments. Models are also used to translate drug action from in vitro to in vivo conditions or from animal models to human patients. Recently, mathematical models that incorporate drug-target binding and subsequent downstream responses have been shown to advance our understanding and increase predictive power of drug efficacy predictions. We here discuss current approaches of modeling drug binding kinetics that aim at improving model-based drug development in the future. This in turn might aid in reducing the large number of failed clinical trials.
    MeSH term(s) Animals ; Drug Delivery Systems/methods ; Drug Design ; Humans ; Kinetics ; Models, Theoretical ; Pharmaceutical Preparations/metabolism
    Chemical Substances Pharmaceutical Preparations
    Language English
    Publishing date 2019-11-25
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 1358415-7
    ISSN 1420-9071 ; 1420-682X
    ISSN (online) 1420-9071
    ISSN 1420-682X
    DOI 10.1007/s00018-019-03376-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Identification of evolutionary and kinetic drivers of NAD-dependent signaling.

    Bockwoldt, Mathias / Houry, Dorothée / Niere, Marc / Gossmann, Toni I / Reinartz, Ines / Schug, Alexander / Ziegler, Mathias / Heiland, Ines

    Proceedings of the National Academy of Sciences of the United States of America

    2019  Volume 116, Issue 32, Page(s) 15957–15966

    Abstract: Nicotinamide adenine dinucleotide (NAD) provides an important link between metabolism and signal transduction and has emerged as central hub between bioenergetics and all major cellular events. NAD-dependent signaling (e.g., by sirtuins and poly- ... ...

    Abstract Nicotinamide adenine dinucleotide (NAD) provides an important link between metabolism and signal transduction and has emerged as central hub between bioenergetics and all major cellular events. NAD-dependent signaling (e.g., by sirtuins and poly-adenosine diphosphate [ADP] ribose polymerases [PARPs]) consumes considerable amounts of NAD. To maintain physiological functions, NAD consumption and biosynthesis need to be carefully balanced. Using extensive phylogenetic analyses, mathematical modeling of NAD metabolism, and experimental verification, we show that the diversification of NAD-dependent signaling in vertebrates depended on 3 critical evolutionary events: 1) the transition of NAD biosynthesis to exclusive usage of nicotinamide phosphoribosyltransferase (NamPT); 2) the occurrence of nicotinamide N-methyltransferase (NNMT), which diverts nicotinamide (Nam) from recycling into NAD, preventing Nam accumulation and inhibition of NAD-dependent signaling reactions; and 3) structural adaptation of NamPT, providing an unusually high affinity toward Nam, necessary to maintain NAD levels. Our results reveal an unexpected coevolution and kinetic interplay between NNMT and NamPT that enables extensive NAD signaling. This has implications for therapeutic strategies of NAD supplementation and the use of NNMT or NamPT inhibitors in disease treatment.
    MeSH term(s) Amino Acid Sequence ; Animals ; Biological Evolution ; Biosynthetic Pathways ; HeLa Cells ; Humans ; Kinetics ; NAD/metabolism ; Nicotinamide N-Methyltransferase ; Nicotinamide Phosphoribosyltransferase/chemistry ; Nicotinamide Phosphoribosyltransferase/metabolism ; Phylogeny ; Signal Transduction ; Substrate Specificity ; Vertebrates/metabolism
    Chemical Substances NAD (0U46U6E8UK) ; Nicotinamide N-Methyltransferase (EC 2.1.1.1) ; Nicotinamide Phosphoribosyltransferase (EC 2.4.2.12)
    Language English
    Publishing date 2019-07-24
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.1902346116
    Database MEDical Literature Analysis and Retrieval System OnLINE

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