Martina Schaefer

ORCID: 0000-0003-3640-6435
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About
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Research Areas
  • Crystallization and Solubility Studies
  • X-ray Diffraction in Crystallography
  • Biochemical and Molecular Research
  • Carbohydrate Chemistry and Synthesis
  • Nuclear Physics and Applications
  • Glycosylation and Glycoproteins Research
  • Nitric Oxide and Endothelin Effects
  • Nuclear physics research studies
  • Enzyme Structure and Function
  • HIV/AIDS drug development and treatment
  • Lanthanide and Transition Metal Complexes
  • Chemical Synthesis and Analysis
  • Cancer, Hypoxia, and Metabolism
  • Nuclear reactor physics and engineering
  • Hemoglobin structure and function
  • Coagulation, Bradykinin, Polyphosphates, and Angioedema
  • Microbial Natural Products and Biosynthesis
  • Chronic Lymphocytic Leukemia Research
  • Enzyme function and inhibition
  • Vitamin K Research Studies
  • Dermatology and Skin Diseases
  • Pharmacological Receptor Mechanisms and Effects
  • Marine Sponges and Natural Products
  • Advanced Measurement and Metrology Techniques
  • Quinazolinone synthesis and applications

Bayer (Germany)
2007-2024

Nuvisan (Germany)
2021-2024

University of Patras
2014

Freie Universität Berlin
2009

Institut de Neurobiologie de la Méditerranée
2007

Inserm
2007

University of Milan
2005

University of Göttingen
1991-2002

Humboldt-Universität zu Berlin
1999

New isomeric states in the neutron-rich nuclei near $Z\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}28$ and $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40$ shell closures have been identified among reaction products of a $60.3A$ MeV ${}^{86}\mathrm{Kr}$ beam on ${}^{\mathrm{nat}}\mathrm{Ni}$ target. From measured decay properties information about excited their nuclear structure has obtained. The isomerism is related mostly to occupation neutron ${g}_{9/2}$ orbital, an intruder...

10.1103/physrevlett.81.766 article EN Physical Review Letters 1998-07-27

Abstract The phosphoinositide 3‐kinase (PI3K) pathway is aberrantly activated in many disease states, including tumor cells, either by growth factor receptor tyrosine kinases or the genetic mutation and amplification of key components. A variety PI3K isoforms play differential roles cancers. As such, development inhibitors from novel compound classes should lead to pharmacological pharmacokinetic profiles allow exploration various indications, combinations, dosing regimens. screening effort...

10.1002/cmdc.201600148 article EN cc-by-nc-nd ChemMedChem 2016-06-16

Heme is a vital molecule for all life forms with heme being capable of assisting in catalysis, binding ligands, and undergoing redox changes. Heme-related dysfunction can lead to cardiovascular diseases the oxidation soluble guanylyl cyclase (sGC) critically implicated some these diseases. sGC, main nitric oxide (NO) receptor, stimulates second messenger cGMP production, whereas reactive oxygen species are known scavenge NO oxidize/inactivate leading sGC degradation. This vulnerability...

10.1074/jbc.m110.111559 article EN cc-by Journal of Biological Chemistry 2010-05-13

Herein we describe the discovery, mode of action, and preclinical characterization soluble guanylate cyclase (sGC) activator runcaciguat. The sGC enzyme, via formation cyclic guanosine monophoshphate, is a key regulator body tissue homeostasis. activators with their unique action are activating oxidized heme-free therefore NO-unresponsive form sGC, which formed under oxidative stress. first generation like cinaciguat or ataciguat exhibited limitations were discontinued. We overcame...

10.1021/acs.jmedchem.0c02154 article EN cc-by-nc-nd Journal of Medicinal Chemistry 2021-04-19

The soluble guanylyl cyclase (sGC) is an important receptor for nitric oxide (NO). Nitric activates sGC several hundred fold to generate cGMP from GTP. Because of sGC's salutary roles in cardiovascular physiology, it has received substantial attention as a drug target. heme domain key its regulation not only contains the NO activation site but also harbors sites NO-independent activators well S-nitrosylation (β1 C122) involved desensitization. Here we report crystal structure activator BAY...

10.1021/bi301657w article EN Biochemistry 2013-04-24

Factor XI (FXI), the zymogen of activated FXI (FXIa), is an attractive target for novel anticoagulants because inhibition offers potential to reduce thrombosis risk while minimizing bleeding. BAY 1213790, a anti-FXIa antibody, was generated using phage display technology. Crystal structure analysis FXIa-BAY 1213790 complex demonstrated that tyrosine-rich complementarity-determining region 3 loop heavy chain penetrated deepest into FXIa binding epitope, forming network favorable interactions...

10.1016/j.jmb.2019.09.008 article EN cc-by-nc-nd Journal of Molecular Biology 2019-10-24

Activated coagulation factor XI (FXIa) is a highly attractive antithrombotic target as it contributes to the development and progression of thrombosis but thought play only minor role in hemostasis so that its inhibition may allow for decoupling efficacy bleeding time prolongation. Herein, we report our major efforts identify an orally bioavailable, reversible FXIa inhibitor. Using protein structure-based de novo design approach, identified novel micromolar hit with physicochemical...

10.1021/acs.jmedchem.3c00795 article EN cc-by Journal of Medicinal Chemistry 2023-09-05

Herein, we describe the identification, chemical optimization, and preclinical characterization of novel soluble guanylate cyclase (sGC) stimulators. Given very broad therapeutic opportunities for sGC stimulators, new tailored molecules distinct indications with specific pharmacokinetics, tissue distribution, physicochemical properties will be required in future. Here, report ultrahigh-throughput (uHTS)-based discovery a class stimulators from an imidazo[1,2-a]pyridine lead series. Through...

10.1021/acs.jmedchem.2c02082 article EN Journal of Medicinal Chemistry 2023-04-11

The concentration of clobetasol propionate in the stratum corneum after application three different formulations was determined, quantifying influence on bioavailability drug. sampled by tape stripping. concentrations were determined quantitatively HPLC. After Clobetasol Propionate Cream USP, 0.05%, and Temovate Cream, identical amounts drug found corneum, whereas ε Emollient, quantity clearly decreased. From results obtained measuring adjacent sites skin where creams had not been applied,...

10.1159/000029845 article EN Skin Pharmacology and Physiology 1999-01-01

Despite extensive research on small molecule thrombin inhibitors for oral application in the past decades, only a single double prodrug with very modest bioavailability has reached human therapy as marketed drug. We have undertaken major efforts to identify neutral, non-prodrug inhibitors. Using holistic analysis of all available internal data, we were able build computational models and apply these selection lead series highest possibility achieving bioavailability. In our design, relied...

10.1021/acs.jmedchem.0c01035 article EN cc-by-nc-nd Journal of Medicinal Chemistry 2020-10-27

The matrix metalloprotease ADAMTS7 has been identified by multiple genome-wide association studies as being involved in the development of coronary artery disease. Subsequent research revealed proteolytic function enzyme to be relevant for atherogenesis and restenosis after vessel injury. Based on a publicly known dual ADAMTS4/ADAMTS5 inhibitor, we have silico designed an inhibitor catalytic domain, which served starting point optimization campaign. Initially our inhibitors suffered from low...

10.1021/acs.jmedchem.3c02036 article EN cc-by-nc-nd Journal of Medicinal Chemistry 2024-02-13

1. In the laboratory, a microcosm experiment was set up to study (1) interaction between two collembolan species Onychiurus furcifer (Börner) and Heteromurus nitidus (Templeton) during 24 weeks of incubation; (2) influence slug ( Arion rufus L.) cast material on outcome this interaction; (3) activity microbial biomass, respiration nutrient mobilization. 2. The CO 2 production monitored every other week NH 4 + , NO 3 – PO 3– contents leachates were determined weeks. After 12 incubation,...

10.1046/j.1365-2435.1999.00303.x article EN Functional Ecology 1999-04-01

Abstract DHODH is a key enzyme in the biosynthesis of pyrimidines and recent studies have renewed interest this old anti-cancer target. Here, we disclose discovery 4-triazolosalicylamides as inhibitors their structure activity relationship (SAR). The hit cluster was discovered during phenotypic high throughput screen (HTS) 2.5 million compounds where proliferation H460 lung cancer cells used read-out. successfully identified molecular target by comparing profile hits panel cell lines to set...

10.1158/1538-7445.am2019-2 article EN Cancer Research 2019-07-01

The -decay study of the neutron drip line nuclei , and is presented. These were produced by fragmentation 95 MeV/ projectiles on a target. separated doubly achromatic projectile-fragment separator RIPS, implanted into stopper to observe their decays. half-lives -delayed emission probabilities preliminarily determined for first time.

10.1088/0954-3899/24/8/012 article EN Journal of Physics G Nuclear and Particle Physics 1998-08-01

A key prerequisite for the successful application of protein crystallography in drug discovery is to establish a robust crystallization system new drug-target fast enough deliver crystal structures when first inhibitors have been identified hit-finding campaign or, at latest, subsequent hit-to-lead process. The crucial step towards generating well folded proteins with high likelihood crystallizing identification suitable truncation variants target protein. In some cases an optimal length...

10.1107/s2059798324007939 article EN cc-by Acta Crystallographica Section D Structural Biology 2024-08-29

DHODH is a key enzyme in the biosynthesis of pyrimidines and recent studies have renewed interest this old anti-cancer target. Here, we disclose discovery 4-triazolosalicylamides as inhibitors their structure activity relationship (SAR). The hit cluster was discovered during phenotypic high throughput screen (HTS) 2.5 million compounds where proliferation H460 lung cancer cells used read-out. successfully identified molecular target by comparing profile hits panel cell lines to set with...

10.1158/1538-7445.sabcs18-2 article EN Cancer Chemistry 2019-07-01

Abstract For see ChemInform in Full Text.

10.1002/chin.200338101 article EN ChemInform 2003-08-27

Abstract Immune checkpoint blockade using antibodies targeting the cell surface expressed proteins CTLA-4, PD-1 and PD-L1 has revolutionized cancer care its clinical impact in several indications prompted a search for complementary immunostimulatory approaches that can further increase efficacy of these drugs. Mitogen-activated protein kinase 1 (MAP4K1; HPK1), serine/threonine exclusively hematopoietic lineages, mediates negative feedback signal downstream T-cell receptor stimulation. Its...

10.1158/1538-7445.am2021-1722 article EN Cancer Research 2021-07-01
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