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https://www.readbyqxmd.com/read/29784838/in-vivo-and-in-vitro-effects-of-a-clpp-activating-antibiotic-against-vancomycin-resistant-enterococci
#1
Autumn Brown Gandt, Elizabeth C Griffith, Ida M Lister, Lisa L Billings, Angel Han, Rajendra Tangallapally, Ying Zhao, Aman P Singh, Richard E Lee, Michael D LaFleur
Antibiotics with novel bactericidal mechanisms of action are urgently needed. The antibiotic acyldepsipeptide 4 (ADEP4) activates the ClpP protease and causes cells to self-digest. The effects of ADEP4 and ClpP activation have not been sufficiently characterized for the enterococci, which are important pathogens known for high levels of acquired and intrinsic antibiotic resistance. In the present study, ADEP4 was found to be potently active against both Enterococcus faecalis and Enterococcus faecium with an MIC90 of 0...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29778055/new-insights-into-the-effects-of-support-matrix-on-the-removal-of-organic-micro-pollutants-and-the-microbial-community-in-constructed-wetlands
#2
Liang Zhang, Tao Lyu, Carlos Andrés Ramírez Vargas, Carlos A Arias, Pedro N Carvalho, Hans Brix
Constructed wetlands (CWs) are an eco-friendly and cost-effective technology to remove organic micro-pollutants (OMPs) from wastewater. The support matrix is an important component in CWs as it has a primary role in the growth and development of plants and microbes. However, the roles of the support matrix in CWs in removing OMPs have not been systematically studied. Therefore, in this study, six common materials (sand, zeolite, blast iron slag, petcoke, polonite and crushed autoclaved aerated concrete (CAAC)) as support matrixes were firstly investigated by batch tests to explore their adsorption capacities to selected OMPs (ibuprofen, iohexol, tebuconazole and imazalil)...
May 16, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29775273/the-role-of-clpp-protease-in-bacterial-pathogenesis-and-human-diseases
#3
Vaibhav Bhandari, Keith S Wong, Jin Lin Zhou, Mark F Mabanglo, Robert A Batey, Walid A Houry
In prokaryotic cells and eukaryotic organelles, the ClpP protease plays an important role in proteostasis. The disruption of ClpP function has been shown to influence the infectivity and virulence of a number of bacterial pathogens. More recently, ClpP has been found to be involved in various forms of carcinomas and in Perrault syndrome, which is an inherited condition characterized by hearing loss in males and females and by ovarian abnormalities in females. Hence, targeting ClpP is a potentially viable, attractive option for the treatment of different ailments...
May 18, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/29760236/anti-sigma-factor-ylad-regulates-transcriptional-activity-of-sigma-factor-ylac-and-sporulation-via-manganese-dependent-redox-sensing-molecular-switch-in-bacillus-subtilis
#4
Min-Kyu Kwak, Han-Bong Ryu, Sung-Hyun Song, Jin-Won Lee, Sa-Ouk Kang
YlaD, a membrane-anchored anti-sigma factor of Bacillus subtilis , contains a HX3 CXXC motif that functions as a redox-sensing domain and belongs to one of the zinc-coordinated anti-sigma factor families. Despite previously showing that the YlaC transcription is controlled by YlaD, experimental evidence of how the YlaC-YlaD interaction is affected by active cysteines and/or metal ions is lacking. Here, we showed that the P yla promoter is autoregulated solely by YlaC. Moreover, reduced YlaD contained zinc and iron, while oxidized YlaD did not...
May 14, 2018: Biochemical Journal
https://www.readbyqxmd.com/read/29760139/clpa-and-htpx-proteases-are-involved-in-intrinsic-aminoglycoside-resistance-of-stenotrophomonas-maltophilia-and-are-potential-aminoglycoside-adjuvant-targets
#5
Hsin-Hui Huang, Yi-Tsung Lin, Peng-Ying Chen, Li-Hua Li, Hsiao-Chen Ning, Tsuey-Ching Yang
The linkage of protease-chaperon system, SmeYZ pump, and aminoglycoside resistance was assessed in Stenotrophomonas maltophilia The clpA , clpS , clpP , and htpX genes were upregulated in response to kanamycin exposure. Of them, clpA and htpX were the primary determinants responsible for intrinsic AG resistance. Inactivation of clpA and htpX compromised protease-mediated intrinsic aminoglycoside resistances and weakened SmeYZ pump-mediated aminoglycoside resistance, signifying HtpX and ClpA as potential AG adjuvant targets for treatment of S...
May 14, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29734778/antibiotic-sensitivity-profiling-and-virulence-potential-of-campylobacter-jejuni-isolates-from-estuarine-water-in-the-eastern-cape-province-south-africa
#6
Anthony C Otigbu, Anna M Clarke, Justine Fri, Emmanuel O Akanbi, Henry A Njom
Campylobacter jejuni (CJ) is a zoonotic microbe and a major causative organism of diarrheal infection in humans that often has its functional characteristics inactivated in stressed conditions. The current study assessed the correlation between recovered CJ and water quality parameters and the drug sensitivity patterns of the pathogen to frontline antibiotics in human and veterinary medicine. Water samples ( n = 244) from rivers/estuarines were collected from April⁻September 2016, and physicochemical conditions were recorded on-site...
May 6, 2018: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/29682736/medical-comorbidities-in-patients-with-lichen-planopilaris-a-retrospective-case-control-study
#7
Raymond M Fertig, Shasa Hu, Austin J Maddy, Alexandra Balaban, Nouf Aleid, Adam Aldahan, Antonella Tosti
BACKGROUND: Lichen planopilaris (LPP) is a rare inflammatory lymphocyte-mediated disease of the scalp considered to have an autoimmune pathogenesis. OBJECTIVES: To identify the prevalence of medical comorbidities in patients with classic LPP (CLPP) and frontal fibrosing alopecia (FFA). METHODS: The medical records of 206 LPP patients and 323 control patients were retrospectively reviewed for existing comorbidities. The control group consisted of 257 patients with androgenetic alopecia (ICD 9 = 704...
April 16, 2018: International Journal of Dermatology
https://www.readbyqxmd.com/read/29588285/clpp-deficiency-protects-against-metabolic-syndrome-but-hinders-adaptive-thermogenesis
#8
Christina Becker, Alexandra Kukat, Karolina Szczepanowska, Steffen Hermans, Katharina Senft, Christoph Paul Brandscheid, Priyanka Maiti, Aleksandra Trifunovic
Mitochondria are fundamental for cellular metabolism as they are both a source and a target of nutrient intermediates originating from converging metabolic pathways, and their role in the regulation of systemic metabolism is increasingly recognized. Thus, maintenance of mitochondrial homeostasis is indispensable for a functional energy metabolism of the whole organism. Here, we report that loss of the mitochondrial matrix protease CLPP results in a lean phenotype with improved glucose homeostasis. Whole-body CLPP-deficient mice are protected from diet-induced obesity and insulin resistance, which was not present in mouse models with either liver- or muscle-specific depletion of CLPP However, CLPP ablation also leads to a decline in brown adipocytes function leaving mice unable to cope with a cold-induced stress due to non-functional adaptive thermogenesis...
March 27, 2018: EMBO Reports
https://www.readbyqxmd.com/read/29531063/single-molecule-peptide-fingerprinting
#9
Jetty van Ginkel, Mike Filius, Malwina Szczepaniak, Pawel Tulinski, Anne S Meyer, Chirlmin Joo
Proteomic analyses provide essential information on molecular pathways of cellular systems and the state of a living organism. Mass spectrometry is currently the first choice for proteomic analysis. However, the requirement for a large amount of sample renders a small-scale proteomics study challenging. Here, we demonstrate a proof of concept of single-molecule FRET-based protein fingerprinting. We harnessed the AAA+ protease ClpXP to scan peptides. By using donor fluorophore-labeled ClpP, we sequentially read out FRET signals from acceptor-labeled amino acids of peptides...
March 27, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29453267/plant-microbe-and-abiotic-factors-influencing-salmonella-survival-and-growth-on-alfalfa-sprouts-and-swiss-chard-microgreens
#10
Elizabeth Reed, Christina M Ferreira, Rebecca Bell, Eric W Brown, Jie Zheng
Microgreens, like sprouts, are relatively fast-growing products and are generally consumed raw. Moreover, as observed for sprouts, microbial contamination from preharvest sources may also be present in the production of microgreens. In this study, two Salmonella enterica serovars (Hartford and Cubana), applied at multiple inoculation levels, were evaluated for survival and growth on alfalfa sprouts and Swiss chard microgreens by using the most-probable-number (MPN) method. Various abiotic factors were also examined for their effects on Salmonella survival and growth on sprouts and microgreens...
May 1, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29446505/clpc-and-meca-components-of-a-proteolytic-machine-prevent-spo0a-p-dependent-transcription-without-degradation
#11
Andrew W Tanner, Valerie J Carabetta, David Dubnau
In Bacillus subtilis, a proteolytic machine composed of MecA, ClpC and ClpP degrades the transcription factor ComK, controlling its accumulation during growth. MecA also inhibits sporulation and biofilm formation by down-regulating spoIIG and sinI, genes that are dependent for their transcription on the phosphorylated protein Spo0A-P. Additionally, MecA has been shown to interact in vitro with Spo0A. Although the inhibitory effect on transcription requires MecA's binding partner ClpC, inhibition is not accompanied by the degradation of Spo0A, pointing to a previously unsuspected regulatory mechanism involving these proteins...
April 2018: Molecular Microbiology
https://www.readbyqxmd.com/read/29420235/loss-of-mitochondrial-protease-clpp-protects-mice-from-diet-induced-obesity-and-insulin-resistance
#12
Shylesh Bhaskaran, Gavin Pharaoh, Rojina Ranjit, Ashley Murphy, Satoshi Matsuzaki, Binoj C Nair, Brittany Forbes, Suzana Gispert, Georg Auburger, Kenneth M Humphries, Michael Kinter, Timothy M Griffin, Sathyaseelan S Deepa
Caseinolytic peptidase P (ClpP) is a mammalian quality control protease that is proposed to play an important role in the initiation of the mitochondrial unfolded protein response (UPRmt ), a retrograde signaling response that helps to maintain mitochondrial protein homeostasis. Mitochondrial dysfunction is associated with the development of metabolic disorders, and to understand the effect of a defective UPRmt on metabolism, ClpP knockout ( ClpP -/- ) mice were analyzed. ClpP -/- mice fed ad libitum have reduced adiposity and paradoxically improved insulin sensitivity...
March 2018: EMBO Reports
https://www.readbyqxmd.com/read/29378887/survival-of-anaerobic-fe-2-stress-requires-the-clpxp-protease
#13
Brittany D Bennett, Kaitlyn E Redford, Jeffrey A Gralnick
Shewanella oneidensis strain MR-1 is a versatile bacterium capable of respiring extracellular, insoluble ferric oxide minerals under anaerobic conditions. The respiration of iron minerals results in the production of soluble ferrous ions, which at high concentrations are toxic to living organisms. It is not fully understood how Fe2+ is toxic to cells anaerobically, nor is it fully understood how S. oneidensis is able to resist high levels of Fe2+ Here we describe the results of a transposon mutant screen and subsequent deletion of the genes clpX and clpP in S...
April 15, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29360618/plastid-phylogenomics-resolves-infrafamilial-relationships-of-the-styracaceae-and-sheds-light-on-the-backbone-relationships-of-the-ericales
#14
Minghui Yan, Peter W Fritsch, Michael J Moore, Tao Feng, Aiping Meng, Jing Yang, Tao Deng, Congxiao Zhao, Xiaohong Yao, Hang Sun, Hengchang Wang
Relationships among the genera of the small, woody family Styracaceae and among families of the large, diverse order Ericales have resisted complete resolution with sequences from one or a few genes. We used plastome sequencing to attempt to resolve the backbone relationships of Styracaceae and Ericales and to explore plastome structural evolution. Complete plastomes for 23 species are newly reported here, including 18 taxa of Styracaceae and five of Ericales (including species of Sapotaceae, Clethraceae, Symplocaceae, and Diapensiaceae)...
April 2018: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/29321722/distinct-virulent-network-between-healthcare-and-community-associated-staphylococcus-aureus-based-on-proteomic-analysis
#15
Lei He, Hongwei Meng, Qian Liu, Mo Hu, Yanan Wang, Xiaoying Chen, Xiaoyun Liu, Min Li
Background: Staphylococcus aureus ( S. aureus or SA) is a leading cause of healthcare-associated (HA-) and community-associated (CA) infection. HA-SA isolates usually cause nosocomial pneumonia, bloodstream infections, catheter-related urinary tract infections, etc . On the other hand, CA-SA isolates usually cause highly fatal diseases, such as SSTIs as well as post influenza necrotic hemorrhagic pneumonia. The differences of the infection types are partially due to the unique characteristics between HA-SA and CA-SA isolates...
2018: Clinical Proteomics
https://www.readbyqxmd.com/read/29291484/impacts-of-design-configuration-and-plants-on-the-functionality-of-the-microbial-community-of-mesocosm-scale-constructed-wetlands-treating-ibuprofen
#16
Liang Zhang, Tao Lyu, Yang Zhang, Mark Button, Carlos A Arias, Kela P Weber, Hans Brix, Pedro N Carvalho
Microbial degradation is an important pathway during the removal of pharmaceuticals in constructed wetlands (CWs). However, the effects of CW design, plant presence, and different plant species on the microbial community in CWs have not been fully explored. This study aims to investigate the microbial community metabolic function of different types of CWs used to treat ibuprofen via community-level physiological profiling (CLPP) analysis. We studied the interactions between three CW designs (unsaturated, saturated and aerated) and six types of mesocosms (one unplanted and five planted, with Juncus, Typha, Berula, Phragmites and Iris) treating synthetic wastewater...
December 23, 2017: Water Research
https://www.readbyqxmd.com/read/29240891/primary-ovarian-insufficiency-and-azoospermia-in-carriers-of-a-homozygous-psmc3ip-stop-gain-mutation
#17
Abdulmoein Eid Al-Agha, Ihab Abdulhamed Ahmed, Esther Nuebel, Mika Moriwaki, Barry Moore, Katherine A Peacock, Tim Mosbruger, Deborah W Neklason, Lynn B Jorde, Mark Yandell, Corrine K Welt
Context: The etiology of primary ovarian insufficiency (POI) remains unknown in most cases. Objective: We sought to identify the genes causing POI. Design: The study was a familial genetic study. Setting: The study was performed at two academic institutions. Patients: We identified a consanguineous Yemeni family in which four daughters had POI. A brother had azoospermia. Intervention: DNA was subjected to whole genome sequencing...
February 1, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29205794/biallelic-mutations-in-lars2-can-cause-perrault-syndrome-type-2-with-neurologic-symptoms
#18
Rika Kosaki, Reiko Horikawa, Eriko Fujii, Kenjiro Kosaki
Perrault syndrome represents a genetically heterogeneous disorder characterized by sensorineural hearing loss in males and females and ovarian dysfunction in females. Causative genes include HARS2, HSD17B4, CLPP, C10orf2, and LARS2. Some patients with Perrault syndrome exhibit neurologic features including learning disability, cerebellar ataxia, and peripheral neuropathy and are classified as type 2 and are clinically separate from those without neurological symptoms other than a hearing loss (type 1). To date, all reported patients with LARS2 mutations (15 patients in 8 families) have been classified as type 1...
February 2018: American Journal of Medical Genetics. Part A
https://www.readbyqxmd.com/read/29186773/metabolic-perturbations-in-a-bacillus-subtilis-clpp-mutant-during-glucose-starvation
#19
(no author information available yet)
Proteolysis is essential for all living organisms to maintain the protein homeostasis and to adapt to changing environmental conditions. ClpP is the main protease in Bacillus subtilis , and forms complexes with different Clp ATPases. These complexes play crucial roles during heat stress, but also in sporulation or cell morphology. Especially enzymes of cell wall-, amino acid-, and nucleic acid biosynthesis are known substrates of the protease ClpP during glucose starvation. The aim of this study was to analyze the influence of a clpP mutation on the metabolism in different growth phases and to search for putative new ClpP substrates...
November 24, 2017: Metabolites
https://www.readbyqxmd.com/read/29183996/structural-characterization-of-the-bacterial-proteasome-homolog-bph-reveals-a-tetradecameric-double-ring-complex-with-unique-inner-cavity-properties
#20
Adrian C D Fuchs, Lorena Maldoner, Katharina Hipp, Marcus D Hartmann, Jörg Martin
Eukaryotic and archaeal proteasomes are paradigms for self-compartmentalizing proteases. To a large extent, their function requires interplay with hexameric ATPases associated with diverse cellular activities (AAA+) that act as substrate unfoldases. Bacteria have various types of self-compartmentalizing proteases; in addition to the proteasome itself, these include the proteasome homolog HslV, which functions together with the AAA+ HslU; the ClpP protease with its partner AAA+ ClpX; and Anbu, a recently characterized ancestral proteasome variant...
January 19, 2018: Journal of Biological Chemistry
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