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51.
Pedras MS Hossain M Sarwar MG Montaut S 《Bioorganic & medicinal chemistry letters》2004,14(22):5469-5471
A simple and inexpensive method for enantiomeric discrimination of the phytoalexins spirobrassinin (1), 1-methoxyspirobrassinin (2) and synthetic analog 1-methylspirobrassinin (6) using the chiral solvating agent 2,2,2-trifluoro-1-(9-anthryl)ethanol in C(6)D(6) is described. Using this method the enantiomeric composition of each sample can be determined accurately by (1)H NMR and the compounds can be recovered readily by chromatography. 相似文献
52.
Unraveling the complexities of plastid transcription in plants 总被引:3,自引:0,他引:3
Khan MS 《Trends in biotechnology》2005,23(11):535-538
53.
Alrefai WA Sarwar Z Tyagi S Saksena S Dudeja PK Gill RK 《American journal of physiology. Gastrointestinal and liver physiology》2005,288(5):G978-G985
Bile acids are efficiently absorbed from the intestinal lumen via the ileal apical sodium-dependent bile acid transporter (ASBT). ASBT function is essential for maintenance of cholesterol homeostasis in the body. The molecular mechanisms of the direct effect of cholesterol on human ASBT function and expression are not entirely understood. The present studies were undertaken to establish a suitable in vitro experimental model to study human ASBT function and its regulation by cholesterol. Luminal membrane bile acid transport was evaluated by the measurement of sodium-dependent 3H-labeled taurocholic acid (3H-TC) uptake in human intestinal Caco-2 cell monolayers. The relative abundance of human ASBT (hASBT) mRNA was determined by real-time PCR. Transient transfection and luciferase assay techniques were employed to assess hASBT promoter activity. Caco-2 cell line was found to represent a suitable model to study hASBT function and regulation. 25-Hydroxycholesterol (25-HCH; 2.5 microg/ml for 24 h) significantly inhibited Na(+)-dependent 3H-TC uptake in Caco-2 cells. This inhibition was associated with a 50% decrease in the V(max) of the transporter with no significant changes in the apparent K(m). The inhibition in hASBT activity was associated with reduction in both the level of hASBT mRNA and its promoter activity. Our data show the inhibition of hASBT function and expression by 25-HCH in Caco-2 cells. These data provide novel evidence for the direct regulation of human ASBT function by cholesterol and suggest that this phenomenon may play a central role in cholesterol homeostasis. 相似文献
54.
Plastid transformation offers the unique advantages of high-level transgene expression and increased transgene containment compared with conventional transgenic technologies. The process relies on the homologous recombination machinery of the plastid incorporating foreign DNA into the plastome, which restricts the method to species where this type of incorporation works well. However, Pal Maliga and colleagues have recently reported a novel approach for integrating foreign DNA into the plastid genome that works independently of homologous recombination. 相似文献
55.
Md. Habban Akhter Sarwar Beg Mohammed Tarique Arshi Malik Sarah Afaq Hani Choudhry Salman Hosawi 《Biochimica et Biophysica Acta (BBA)/General Subjects》2021,1865(2):129777
BackgroundIn past few decades, the research on engineered nanocarriers (NCs) has gained significant attention in cancer therapy due to selective delivery of drug molecules on the diseased cells thereby preventing unwanted uptake into healthy cells to cause toxicity.Scope of reviewThe applicability of enhanced permeability and retention (EPR) effect for the delivery of nanomedicines in cancer therapy has gained limited success due to poor accessibility of the drugs to the target cells where non-specific payload delivery to the off target region lack substantial reward over the conventional therapeutic systems.Major conclusionsIn spite of the fact, nanomedicines fabricated from the biocompatible nanocarriers have reduced targeting potential for meaningful clinical benefits. However, over expression of receptors on the tumor cells provides opportunity to design functional nanomedicine to bind substantially and deliver therapeutics to the cells or tissues of interest by alleviating the bio-toxicity and unwanted effects. This critique will give insight into the over expressed receptor in various tumor and targeting potential of functional nanomedicine as new therapeutic avenues for effective treatment.General significanceThis review shortly shed light on EPR-based drug targeting using nanomedicinal strategies, their limitation, and advances in therapeutic targeting to the tumor cells. 相似文献
56.
Evidence of Cotton leaf curl Burewala virus Variant and its Associate Betasatellite Causing Yellow Mosaic of Eggplant (Solanum melongena) in Pakistan 下载免费PDF全文
Ishtiaq Hassan Muhammad Saeed Nighat Sarwar Shahid Mansoor 《Journal of Phytopathology》2015,163(3):233-237
Eggplant (Solanum melongena L.) plants with severe leaf mosaic and mottling were found in a kitchen garden near cotton fields in Pakistan. Rolling Circle Amplification products from six of the naturally infected eggplant plants, subjected to PCR, successfully amplified expected products of 2.8 and 1.4 kb using begomovirus and betasatellite‐specific primers, respectively. Based on 99% nucleotide sequence identity, the virus was identified as a variant of Cotton leaf curl Burewala virus (CLCuBuV) (GenBank Accession No. HG428709). Likewise, the sequenced betasatellite with a maximum of 97% nucleotide sequence identity was recognized as a new variant of Cotton leaf curl Multan betasatellite (CLCuMuBMul) (GenBank Accession No. HG428708). The symptomatic induction of Cotton leaf curl disease in CLCuBuV susceptible cotton genotype CIM‐496 by back‐indexing further confirmed the presence of CLCuBuV in eggplant. This is the first report of CLCuBuV and its associate betasatellite in naturally infected plants of eggplant. 相似文献
57.
58.
Hanif Sajid Saleem Muhammad Farrukh Sarwar Muhammad Irshad Muhammad Shakoor Abdul Wahid Muhammad Ashfaq Khan Haroon Zaman 《Journal of Plant Growth Regulation》2021,40(1):305-312
Journal of Plant Growth Regulation - Abiotic stresses are the prime coercion to sustainable crop production in changing climate scenario. Heat and drought stresses at reproductive as well as... 相似文献
59.
Prashant K. Singh Maruf Sarwar Elena Maklashina Violetta Kotlyar Sany Rajagukguk Thomas M. Tomasiak Gary Cecchini Tina M. Iverson 《The Journal of biological chemistry》2013,288(34):24293-24301
Respiratory processes often use quinone oxidoreduction to generate a transmembrane proton gradient, making the 2H+/2e− quinone chemistry important for ATP synthesis. There are a variety of quinones used as electron carriers between bioenergetic proteins, and some respiratory proteins can functionally interact with more than one quinone type. In the case of complex II homologs, which couple quinone chemistry to the interconversion of succinate and fumarate, the redox potentials of the biologically available ubiquinone and menaquinone aid in driving the chemical reaction in one direction. In the complex II homolog quinol:fumarate reductase, it has been demonstrated that menaquinol oxidation requires at least one proton shuttle, but many of the remaining mechanistic details of menaquinol oxidation are not fully understood, and little is known about ubiquinone reduction. In the current study, structural and computational studies suggest that the sequential removal of the two menaquinol protons may be accompanied by a rotation of the naphthoquinone ring to optimize the interaction with a second proton shuttling pathway. However, kinetic measurements of site-specific mutations of quinol:fumarate reductase variants show that ubiquinone reduction does not use the same pathway. Computational docking of ubiquinone followed by mutagenesis instead suggested redundant proton shuttles lining the ubiquinone-binding site or from direct transfer from solvent. These data show that the quinone-binding site provides an environment that allows multiple amino acid residues to participate in quinone oxidoreduction. This suggests that the quinone-binding site in complex II is inherently plastic and can robustly interact with different types of quinones. 相似文献
60.
Fen Wu Yu Chen Faruque Parvez Stephanie Segers Maria Argos Tariqul Islam Alauddin Ahmed Muhammad Rakibuz-Zaman Rabiul Hasan Golam Sarwar Habibul Ahsan 《PloS one》2013,8(3)