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  1. Article ; Online: Shedding light on both ends: An update on analytical approaches for N- and C-terminomics.

    Koudelka, Tomas / Winkels, Konrad / Kaleja, Patrick / Tholey, Andreas

    Biochimica et biophysica acta. Molecular cell research

    2021  Volume 1869, Issue 1, Page(s) 119137

    Abstract: Though proteases were long regarded as nonspecific degradative enzymes, over time, it was recognized that they also hydrolyze peptide bonds very specifically with a limited substrate pool. This irreversible posttranslational modification modulates the ... ...

    Abstract Though proteases were long regarded as nonspecific degradative enzymes, over time, it was recognized that they also hydrolyze peptide bonds very specifically with a limited substrate pool. This irreversible posttranslational modification modulates the fate and activity of many proteins, making proteolytic processing a master switch in the regulation of e.g., the immune system, apoptosis and cancer progression. N- and C-terminomics, the identification of protein termini, has become indispensable in elucidating protease substrates and therefore protease function. Further, terminomics has the potential to identify yet unknown proteoforms, e.g. formed by alternative splicing or the recently discovered alternative ORFs. Different strategies and workflows have been developed that achieve higher sensitivity, a greater depth of coverage or higher throughput. In this review, we summarize recent developments in both N- and C-terminomics and include the potential of top-down proteomics which inherently delivers information on both ends of analytes in a single analysis.
    MeSH term(s) Animals ; Humans ; Proteolysis ; Proteome/chemistry ; Proteome/genetics ; Proteome/metabolism ; Proteomics/methods ; RNA Splicing
    Chemical Substances Proteome
    Language English
    Publishing date 2021-10-06
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 60-7
    ISSN 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 1879-2650
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbamcr.2021.119137
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Quantitative Top-Down Proteomics by Isobaric Labeling with Thiol-Directed Tandem Mass Tags.

    Winkels, Konrad / Koudelka, Tomas / Tholey, Andreas

    Journal of proteome research

    2021  Volume 20, Issue 9, Page(s) 4495–4506

    Abstract: While identification-centric (qualitative) top-down proteomics (TDP) has seen rapid progress in the recent past, the quantification of intact proteoforms within complex proteomes is still challenging. The by far mostly applied approach is label-free ... ...

    Abstract While identification-centric (qualitative) top-down proteomics (TDP) has seen rapid progress in the recent past, the quantification of intact proteoforms within complex proteomes is still challenging. The by far mostly applied approach is label-free quantification, which, however, provides limited multiplexing capacity, and its use in combination with multidimensional separation is encountered with a number of problems. Isobaric labeling, which is a standard quantification approach in bottom-up proteomics, circumvents these limitations. Here, we introduce the application of thiol-directed isobaric labeling for quantitative TDP. For this purpose, we analyzed the labeling efficiency and optimized tandem mass spectrometry parameters for optimal backbone fragmentation for identification and reporter ion formation for quantification. Two different separation schemes, gel-eluted liquid fraction entrapment electrophoresis × liquid chromatography-mass spectrometry (LC-MS) and high/low-pH LC-MS, were employed for the analyses of either
    MeSH term(s) Escherichia coli/genetics ; Proteome ; Proteomics ; Sulfhydryl Compounds ; Tandem Mass Spectrometry
    Chemical Substances Proteome ; Sulfhydryl Compounds
    Language English
    Publishing date 2021-08-02
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2078618-9
    ISSN 1535-3907 ; 1535-3893
    ISSN (online) 1535-3907
    ISSN 1535-3893
    DOI 10.1021/acs.jproteome.1c00460
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Regulation of microtubule detyrosination by Ca2+ and conventional calpains.

    Bär, Julia / Popp, Yannes / Koudelka, Tomas / Tholey, Andreas / Mikhaylova, Marina

    Journal of cell science

    2022  Volume 135, Issue 9

    Abstract: Detyrosination is a major post-translational modification of microtubules (MTs), which has significant impact on MT function in cell division, differentiation, growth, migration and intracellular trafficking. Detyrosination of α-tubulin occurs mostly via ...

    Abstract Detyrosination is a major post-translational modification of microtubules (MTs), which has significant impact on MT function in cell division, differentiation, growth, migration and intracellular trafficking. Detyrosination of α-tubulin occurs mostly via the recently identified complex of vasohibin 1 or 2 (VASH1 and VASH2, respectively) with small vasohibin binding protein (SVBP). However, there is still remaining detyrosinating activity in the absence of VASH1 and/or VASH2 and SVBP, and little is known about the regulation of detyrosination. Here, we found that intracellular Ca2+ is required for efficient MT detyrosination. Furthermore, we show that the Ca2+-dependent proteases calpains 1 and 2 (CAPN1 and CAPN2, respectively) regulate MT detyrosination in VASH1- and SVBP-overexpressing human embryonic kidney (HEK293T) cells. We identified new calpain cleavage sites in the N-terminal disordered region of VASH1. However, this cleavage did not affect the enzymatic activity of vasohibins. In conclusion, we suggest that the regulation of VASH1-mediated MT detyrosination by calpains could occur independently of vasohibin catalytic activity or via another yet unknown tubulin carboxypeptidase. Importantly, the Ca2+ dependency of calpains could allow a fine regulation of MT detyrosination. Thus, identifying the calpain-regulated pathway of MT detyrosination can be of major importance for basic and clinical research.
    MeSH term(s) Angiogenic Proteins/metabolism ; Calcium/metabolism ; Calpain/metabolism ; Carrier Proteins/metabolism ; Cell Cycle Proteins/genetics ; Cell Cycle Proteins/metabolism ; HEK293 Cells ; Humans ; Microtubules/metabolism ; Tubulin/metabolism
    Chemical Substances Angiogenic Proteins ; Carrier Proteins ; Cell Cycle Proteins ; SVBP protein, human ; Tubulin ; VASH1 protein, human ; VASH2 protein, human ; Calpain (EC 3.4.22.-) ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2022-05-06
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2993-2
    ISSN 1477-9137 ; 0021-9533
    ISSN (online) 1477-9137
    ISSN 0021-9533
    DOI 10.1242/jcs.259108
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Validation of Top-Down Proteomics Data by Bottom-Up-Based N-Terminomics Reveals Pitfalls in Top-Down-Based Terminomics Workflows.

    Winkels, Konrad / Koudelka, Tomas / Kaulich, Philipp T / Leippe, Matthias / Tholey, Andreas

    Journal of proteome research

    2022  Volume 21, Issue 9, Page(s) 2185–2196

    Abstract: Bottom-up proteomics (BUP)-based N-terminomics techniques have become standard to identify protein N-termini. While these methods rely on the identification of N-terminal peptides only, top-down proteomics (TDP) comes with the promise to provide ... ...

    Abstract Bottom-up proteomics (BUP)-based N-terminomics techniques have become standard to identify protein N-termini. While these methods rely on the identification of N-terminal peptides only, top-down proteomics (TDP) comes with the promise to provide additional information about post-translational modifications and the respective C-termini. To evaluate the potential of TDP for terminomics, two established TDP workflows were employed for the proteome analysis of the nematode
    MeSH term(s) Arginine ; DNA-Binding Proteins ; Protein Processing, Post-Translational ; Proteome/analysis ; Proteomics/methods ; Workflow
    Chemical Substances DNA-Binding Proteins ; Proteome ; Arginine (94ZLA3W45F)
    Language English
    Publishing date 2022-08-16
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2078618-9
    ISSN 1535-3907 ; 1535-3893
    ISSN (online) 1535-3907
    ISSN 1535-3893
    DOI 10.1021/acs.jproteome.2c00277
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Structural analysis of PLD3 reveals insights into the mechanism of lysosomal 5' exonuclease-mediated nucleic acid degradation.

    Roske, Yvette / Cappel, Cedric / Cremer, Nils / Hoffmann, Patrick / Koudelka, Tomas / Tholey, Andreas / Heinemann, Udo / Daumke, Oliver / Damme, Markus

    Nucleic acids research

    2023  Volume 52, Issue 1, Page(s) 370–384

    Abstract: The phospholipase D (PLD) family is comprised of enzymes bearing phospholipase activity towards lipids or endo- and exonuclease activity towards nucleic acids. PLD3 is synthesized as a type II transmembrane protein and proteolytically cleaved in ... ...

    Abstract The phospholipase D (PLD) family is comprised of enzymes bearing phospholipase activity towards lipids or endo- and exonuclease activity towards nucleic acids. PLD3 is synthesized as a type II transmembrane protein and proteolytically cleaved in lysosomes, yielding a soluble active form. The deficiency of PLD3 leads to the slowed degradation of nucleic acids in lysosomes and chronic activation of nucleic acid-specific intracellular toll-like receptors. While the mechanism of PLD phospholipase activity has been extensively characterized, not much is known about how PLDs bind and hydrolyze nucleic acids. Here, we determined the high-resolution crystal structure of the luminal N-glycosylated domain of human PLD3 in its apo- and single-stranded DNA-bound forms. PLD3 has a typical phospholipase fold and forms homodimers with two independent catalytic centers via a newly identified dimerization interface. The structure of PLD3 in complex with an ssDNA-derived thymidine product in the catalytic center provides insights into the substrate binding mode of nucleic acids in the PLD family. Our structural data suggest a mechanism for substrate binding and nuclease activity in the PLD family and provide the structural basis to design immunomodulatory drugs targeting PLD3.
    MeSH term(s) Humans ; Lysosomes/metabolism ; Phospholipase D/chemistry ; Phospholipases ; Exodeoxyribonucleases/chemistry
    Chemical Substances Phospholipase D (EC 3.1.4.4) ; Phospholipases (EC 3.1.-) ; PLD3 protein, human (EC 3.1.4.4) ; Exodeoxyribonucleases (EC 3.1.-)
    Language English
    Publishing date 2023-11-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 186809-3
    ISSN 1362-4962 ; 1362-4954 ; 0301-5610 ; 0305-1048
    ISSN (online) 1362-4962 ; 1362-4954
    ISSN 0301-5610 ; 0305-1048
    DOI 10.1093/nar/gkad1114
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Recent Progress Concerning the

    Oeser, Petr / Koudelka, Jakub / Petrenko, Artem / Tobrman, Tomáš

    Molecules (Basel, Switzerland)

    2021  Volume 26, Issue 16

    Abstract: This review summarizes the current state-of-the-art procedures in terms of the preparation ... ...

    Abstract This review summarizes the current state-of-the-art procedures in terms of the preparation of
    Language English
    Publishing date 2021-08-22
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules26165079
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Protease-independent control of parthanatos by HtrA2/Omi.

    Weiß, Jonas / Heib, Michelle / Korn, Thiemo / Hoyer, Justus / Fuchslocher Chico, Johaiber / Voigt, Susann / Koudelka, Tomas / Tholey, Andreas / Adam, Dieter

    Cellular and molecular life sciences : CMLS

    2023  Volume 80, Issue 9, Page(s) 258

    Abstract: HtrA2/Omi is a mitochondrial serine protease with ascribed pro-apoptotic as well as pro-necroptotic functions. Here, we establish that HtrA2/Omi also controls parthanatos, a third modality of regulated cell death. Deletion of HtrA2/Omi protects cells ... ...

    Abstract HtrA2/Omi is a mitochondrial serine protease with ascribed pro-apoptotic as well as pro-necroptotic functions. Here, we establish that HtrA2/Omi also controls parthanatos, a third modality of regulated cell death. Deletion of HtrA2/Omi protects cells from parthanatos while reconstitution with the protease restores the parthanatic death response. The effects of HtrA2/Omi on parthanatos are specific and cannot be recapitulated by manipulating other mitochondrial proteases such as PARL, LONP1 or PMPCA. HtrA2/Omi controls parthanatos in a manner mechanistically distinct from its action in apoptosis or necroptosis, i.e., not by cleaving cytosolic IAP proteins but rather exerting its effects without exiting mitochondria, and downstream of PARP-1, the first component of the parthanatic signaling cascade. Also, previously identified or candidate substrates of HtrA2/Omi such as PDXDC1, VPS4B or moesin are not cleaved and dispensable for parthanatos, whereas DBC-1 and stathmin are cleaved, and thus represent potential parthanatic downstream mediators of HtrA2/Omi. Moreover, mass-spectrometric screening for novel parthanatic substrates of HtrA2/Omi revealed that the induction of parthanatos does not cause a substantial proteolytic cleavage or major alterations in the abundance of mitochondrial proteins. Resolving these findings, reconstitution of HtrA2/Omi-deficient cells with a catalytically inactive HtrA2/Omi mutant restored their sensitivity against parthanatos to the same level as the protease-active HtrA2/Omi protein. Additionally, an inhibitor of HtrA2/Omi's protease activity did not confer protection against parthanatic cell death. Our results demonstrate that HtrA2/Omi controls parthanatos in a protease-independent manner, likely via novel, unanticipated functions as a scaffolding protein and an interaction with so far unknown mitochondrial proteins.
    MeSH term(s) Parthanatos ; Serine Proteases/genetics ; Necroptosis ; Serine Endopeptidases/genetics ; Mitochondrial Proteins/genetics
    Chemical Substances Serine Proteases (EC 3.4.-) ; Serine Endopeptidases (EC 3.4.21.-) ; Mitochondrial Proteins
    Language English
    Publishing date 2023-08-18
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1358415-7
    ISSN 1420-9071 ; 1420-682X
    ISSN (online) 1420-9071
    ISSN 1420-682X
    DOI 10.1007/s00018-023-04904-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: Quantitative Top-Down Proteomics by Isobaric Labeling with Thiol-Directed Tandem Mass Tags

    Winkels, Konrad / Koudelka, Tomas / Tholey, Andreas

    Journal of proteome research. 2021 Aug. 02, v. 20, no. 9

    2021  

    Abstract: While identification-centric (qualitative) top-down proteomics (TDP) has seen rapid progress in the recent past, the quantification of intact proteoforms within complex proteomes is still challenging. The by far mostly applied approach is label-free ... ...

    Abstract While identification-centric (qualitative) top-down proteomics (TDP) has seen rapid progress in the recent past, the quantification of intact proteoforms within complex proteomes is still challenging. The by far mostly applied approach is label-free quantification, which, however, provides limited multiplexing capacity, and its use in combination with multidimensional separation is encountered with a number of problems. Isobaric labeling, which is a standard quantification approach in bottom-up proteomics, circumvents these limitations. Here, we introduce the application of thiol-directed isobaric labeling for quantitative TDP. For this purpose, we analyzed the labeling efficiency and optimized tandem mass spectrometry parameters for optimal backbone fragmentation for identification and reporter ion formation for quantification. Two different separation schemes, gel-eluted liquid fraction entrapment electrophoresis × liquid chromatography–mass spectrometry (LC–MS) and high/low-pH LC–MS, were employed for the analyses of either Escherichia coli (E. coli) proteomes or combined E. coli/yeast samples (two-proteome interference model) to study potential ratio compression. While the thiol-directed labeling introduces a bias in the quantifiable proteoforms, being restricted to Cys-containing proteoforms, our approach showed excellent accuracy in quantification, which is similar to that achievable in bottom-up proteomics. For example, 876 proteoforms could be quantified with high accuracy in an E. coli lysate. The LC–MS data were deposited to the ProteomeXchange with the dataset identifier PXD026310.
    Keywords Escherichia coli ; data collection ; electrophoresis ; liquid chromatography ; models ; proteome ; proteomics ; research ; tandem mass spectrometry ; yeasts
    Language English
    Dates of publication 2021-0802
    Size p. 4495-4506.
    Publishing place American Chemical Society
    Document type Article
    ZDB-ID 2078618-9
    ISSN 1535-3907 ; 1535-3893
    ISSN (online) 1535-3907
    ISSN 1535-3893
    DOI 10.1021/acs.jproteome.1c00460
    Database NAL-Catalogue (AGRICOLA)

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  9. Article ; Online: Formation of trisubstituted buta-1,3-dienes and α,β-unsaturated ketones

    Oeser, Petr / Koudelka, Jakub / Dvořáková, Hana / Tobrman, Tomáš

    RSC advances

    2020  Volume 10, Issue 58, Page(s) 35109–35120

    Abstract: We studied the reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents. We found that the functionalized vinyl phosphates were smoothly converted into tri- and tetrasubstituted buta-1,3- ...

    Abstract We studied the reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents. We found that the functionalized vinyl phosphates were smoothly converted into tri- and tetrasubstituted buta-1,3-dienes
    Language English
    Publishing date 2020-09-22
    Publishing country England
    Document type Journal Article
    ISSN 2046-2069
    ISSN (online) 2046-2069
    DOI 10.1039/d0ra07472a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Phosphorylation of meprin β controls its cell surface abundance and subsequently diminishes ectodomain shedding.

    Armbrust, Fred / Bickenbach, Kira / Koudelka, Tomas / Tholey, Andreas / Pietrzik, Claus / Becker-Pauly, Christoph

    FASEB journal : official publication of the Federation of American Societies for Experimental Biology

    2021  Volume 35, Issue 7, Page(s) e21677

    Abstract: Meprin β is a zinc-dependent metalloprotease exhibiting a unique cleavage specificity with strong preference for acidic amino acids at the cleavage site. Proteomic studies revealed a diverse substrate pool of meprin β including the interleukin-6 receptor ...

    Abstract Meprin β is a zinc-dependent metalloprotease exhibiting a unique cleavage specificity with strong preference for acidic amino acids at the cleavage site. Proteomic studies revealed a diverse substrate pool of meprin β including the interleukin-6 receptor (IL-6R) and the amyloid precursor protein (APP). Dysregulation of meprin β is often associated with pathological conditions such as chronic inflammation, fibrosis, or Alzheimer's disease (AD). The extracellular regulation of meprin β including interactors, sheddases, and activators has been intensively investigated while intracellular regulation has been barely addressed in the literature. This study aimed to analyze C-terminal phosphorylation of meprin β with regard to cell surface expression and proteolytic activity. By immunoprecipitation of endogenous meprin β from the colon cancer cell line Colo320 and subsequent LC-MS analysis, we identified several phosphorylation sites in its C-terminal region. Here, T694 in the C-terminus of meprin β was the most preferred residue after phorbol 12-myristate 13-acetate (PMA) stimulation. We further demonstrated the role of protein kinase C (PKC) isoforms for meprin β phosphorylation and identified the involvement of PKC-α and PKC-β. As a result of phosphorylation, the meprin β activity at the cell surface is reduced and, consequently, the extent of substrate cleavage is diminished. Our data indicate that this decrease of the surface activity is caused by the internalization and degradation of meprin β.
    MeSH term(s) Cell Membrane/metabolism ; Colonic Neoplasms/metabolism ; Colonic Neoplasms/pathology ; Extracellular Space/metabolism ; Gene Expression Regulation ; Humans ; Metalloendopeptidases/genetics ; Metalloendopeptidases/metabolism ; Phosphorylation ; Protein Kinase C beta/genetics ; Protein Kinase C beta/metabolism ; Protein Kinase C-alpha/genetics ; Protein Kinase C-alpha/metabolism ; Proteolysis ; Tumor Cells, Cultured
    Chemical Substances Protein Kinase C beta (EC 2.7.11.13) ; Protein Kinase C-alpha (EC 2.7.11.13) ; Metalloendopeptidases (EC 3.4.24.-) ; meprin A (EC 3.4.24.18)
    Language English
    Publishing date 2021-06-14
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 639186-2
    ISSN 1530-6860 ; 0892-6638
    ISSN (online) 1530-6860
    ISSN 0892-6638
    DOI 10.1096/fj.202100271R
    Database MEDical Literature Analysis and Retrieval System OnLINE

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