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1.
The recA gene of the recombination deficient Enterococcus faecalis strain UV202 was sequenced and found to encode a glycine to aspartic acid mutation at amino acid 265. Both the UV sensitive and recombination deficient phenotypes of the UV202 strain were complemented by expression of the wild-type recA gene cloned under the control of the nisin-inducible promoter of an expression vector. 相似文献
2.
Manda Sathish Sabanis Chetan Dushantrao Shalini Nekkanti Ramya Tokala Soujanya Thatikonda Yellaiah Tangella Gunda Srinivas Shirisha Cherukommu Namballa Hari Krishna Nagula Shankaraiah Narayana Nagesh Ahmed Kamal 《Bioorganic & medicinal chemistry》2018,26(17):4916-4929
A series of new C3-trans-cinnamide linked β-carboline conjugates has been synthesized by coupling between various β-carboline amines and substituted cinnamic acids. Evaluation of their anti-proliferative activity against a panel of selected human cancer cell lines such as A549 (lung cancer), MCF-7 (breast cancer), B16 (melanoma), HeLa (cervical cancer) and a normal cell line NIH3T3 (mouse embryonic fibroblast cell line), suggested that the newly designed conjugates are considerably active against all the tested cancer cell lines with IC50 values 13–45?nM. Moreover, the conjugates 8v and 8x were the most active against MCF-7 cells (14.05?nM and 13.84?nM respectively) and also even potent on other cell lines tested. Further, detailed investigations such as cell cycle analysis, apoptosis induction study, topoisomerase I inhibition assay, DNA binding affinity and docking studies revealed that these new conjugates are DNA interactive topoisomerase I inhibitors. 相似文献
3.
Nagotu S Krikken AM Otzen M Kiel JA Veenhuis M van der Klei IJ 《Traffic (Copenhagen, Denmark)》2008,9(9):1471-1484
We show that Mdv1 and Caf4, two components of the mitochondrial fission machinery in Saccharomyces cerevisiae , also function in peroxisome proliferation. Deletion of MDV1 , CAF4 or both, however, had only a minor effect on peroxisome numbers at peroxisome-inducing growth conditions, most likely related to the fact that Vps1 – and not Dnm1 – is the key player in peroxisome fission in this organism. In contrast, in Hansenula polymorpha , which has only a Dnm1-dependent peroxisome fission machinery, deletion of MDV1 led to a drastic reduction of peroxisome numbers. This phenotype was accompanied by a strong defect in mitochondrial fission. The MDV1 paralog CAF4 is absent in H. polymorpha . In wild-type H. polymorpha , cells Dnm1–mCherry and green fluorescent protein (GFP)–Mdv1 colocalize in spots that associate with both peroxisomes and mitochondria. Furthermore, Fis1 is essential to recruit Mdv1 to the peroxisomal and mitochondrial membrane. However, formation of GFP–Mdv1 spots – and related to this normal organelle fission – is strictly dependent on the presence of Dnm1. In dnm1 cells, GFP–Mdv1 is dispersed over the surface of peroxisomes and mitochondria. Also, in H. polymorpha mdv1 or fis1 cells, the number of Dnm1–GFP spots is strongly reduced. These spots still associate to organelles but are functionally inactive. 相似文献
4.
Gokhale NH Shirisha K Padhye SB Croft SL Kendrick HD Mckee V 《Bioorganic & medicinal chemistry letters》2006,16(2):430-432
The crystal structure of copper (II) complex of 3-arylazo-4-hydroxy-1,2-naphthoquinone is reported. The in vitro antimalarial activity of analogous compounds against Plasmodium falciparum 3D7 strain reveals correlation with metal redox couple, suggesting component of parasitic electron transport chain as a possible target. 相似文献
5.
Shirisha Nagotu Marten Veenhuis Ida J. Van Der Klei 《Traffic (Copenhagen, Denmark)》2010,11(2):175-184
Peroxisomes are unique organelles which display properties of autonomous organelles, as they can multiply by fission of pre‐existing ones. Peroxisomes, however, can also develop from the endoplasmic reticulum (ER). This process has convincingly been shown in peroxisome‐deficient yeast cells, upon reintroduction of the corresponding gene. Whether peroxisomes also are formed from the ER in wild‐type cells that contain peroxisomes is still under debate. Also, the existence of vesicular transport pathways between peroxisomes and the ER is still unresolved. Several new proteins and pathways that play a role in peroxisome proliferation have been identified in the last few years. A surprising finding was that proteins well known for their function in mitochondrial fission (Fis1, Dnm1) are responsible for peroxisome fission as well. In this contribution we discuss recent advancements in research on peroxisome proliferation. 相似文献
6.
Peroxisomal biogenesis disorders (PBDs) represent a spectrum of autosomal recessive metabolic disorders that are collectively characterized by abnormal peroxisome assembly and impaired peroxisomal function. The importance of this ubiquitous organelle for human health is highlighted by the fact that PBDs are multisystemic disorders that often cause death in early infancy. Peroxisomes contribute to central metabolic pathways. Most enzymes in the peroxisomal matrix are linked to lipid metabolism and detoxification of reactive oxygen species. Proper assembly of peroxisomes and thus also import of their enzymes relies on specific peroxisomal biogenesis factors, so called peroxins with PEX being the gene acronym. To date, 13 PEX genes are known to cause PBDs when mutated. Studies of the cellular and molecular defects in cells derived from PBD patients have significantly contributed to the understanding of the functional role of the corresponding peroxins in peroxisome assembly. In this review, we discuss recent data derived from both human cell culture as well as model organisms like yeasts and present an overview on the molecular mechanism underlying peroxisomal biogenesis disorders with emphasis on disorders caused by defects in the peroxisomal matrix protein import machinery. This article is part of a Special Issue entitled: Metabolic Functions and Biogenesis of Peroxisomes in Health and Disease. 相似文献
7.
Membrane remodeling is an important aspect in organelle biogenesis. We show that different peroxisome membrane proteins that play a role in organelle biogenesis and proliferation (Pex8, Pex10, Pex14, Pex25 and Pex11) are subject to spatiotemporal behavior during organelle development. Using fluorescence microscopy analysis of Hansenula polymorpha dnm1 cells that are blocked in the normal fission process, we show that green fluorescent protein (GFP) fusions of Pex8, Pex10, Pex14 and Pex25 show enhanced fluorescence at the organelle extensions that are formed in budding cells. In contrast, Pex11 fluorescence is enriched at the base of this extension on the mother organelle. A fusion protein of GFP with the transporter Pmp47, used as a control, did not show enhanced fluorescence at any specific region of the organelle. The concentration of specific peroxins at the peroxisome surface was lost upon deletion of PEX11 or the N-terminal domain of Pex11 that is involved in membrane remodeling. Comparable distribution patterns as in dnm1 cells were observed in wild-type cells where Pex8, Pex10, Pex14 and Pex25, but not Pex11, were especially present at newly formed organelles that migrated to the bud. We speculate that peroxin reorganization events result in enhanced levels of peroxins involved in peroxisome biogenesis in nascent organelles. 相似文献
8.
Peroxisome proliferation in Hansenula polymorpha requires Dnm1p which mediates fission but not de novo formation 总被引:1,自引:0,他引:1
Nagotu S Saraya R Otzen M Veenhuis M van der Klei IJ 《Biochimica et biophysica acta》2008,1783(5):760-769
We show that the dynamin-like proteins Dnm1p and Vps1p are not required for re-introduction of peroxisomes in Hansenula polymorpha pex3 cells upon complementation with PEX3-GFP. Instead, Dnm1p, but not Vps1p, plays a crucial role in organelle proliferation via fission. In H. polymorpha DNM1 deletion cells (dnm1) a single peroxisome is present that forms long extensions, which protrude into developing buds and divide during cytokinesis. Budding pex11.dnm1 double deletion cells lack these peroxisomal extensions, suggesting that the peroxisomal membrane protein Pex11p is required for their formation. Life cell imaging revealed that fluorescent Dnm1p-GFP spots fluctuate between peroxisomes and mitochondria. On the other hand Pex11p is present over the entire organelle surface, but concentrates during fission at the basis of the organelle extension in dnm1 cells.Our data indicate that peroxisome fission is the major pathway for peroxisome multiplication in H. polymorpha. 相似文献
9.
Saha DK Sandbhor U Shirisha K Padhye S Deobagkar D Anson CE Powell AK 《Bioorganic & medicinal chemistry letters》2004,14(12):3027-3032
A novel mixed-ligand Cu(II) complex of ciprofloxacin (cfH) and phenanthroline, is found to crystallize as a dimeric moiety containing monocationic and dicationic species. Two such dimeric moieties are found in the same unit cell leading to a dicationic cluster. The higher negative redox potential for this cluster dampens its antimycobacterial activity against M. smegmatis. 相似文献
10.
R. Sahaya Glingston Rachayeeta Deb Sachin Kumar Shirisha Nagotu 《Microbes and infection / Institut Pasteur》2019,21(1):20-32
Viruses are obligate intracellular parasites of the host cells. A commonly accepted view is the requirement of internal membranous structures for various aspects of viral life cycle. Organelles enable favourable intracellular environment for several viruses. However, studies reporting organelle dynamics upon viral infections are scant. In this review, we aim to summarize and highlight modulations caused to various organelles upon viral infection or expression of its proteins. 相似文献