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111.
Lin Wei Jiuxiang Gao Shumin Zhang Sijin Wu Zeping Xie Guiying Ling Yi-Qun Kuang Yongliang Yang Haining Yu Yipeng Wang 《The Journal of biological chemistry》2015,290(27):16633-16652
Cathelicidins are a family of gene-encoded peptide effectors of innate immunity found exclusively in vertebrates. They play pivotal roles in host immune defense against microbial invasions. Dozens of cathelicidins have been identified from several vertebrate species. However, no cathelicidin from marine reptiles has been characterized previously. Here we report the identification and characterization of a novel cathelicidin (Hc-CATH) from the sea snake Hydrophis cyanocinctus. Hc-CATH is composed of 30 amino acids, and the sequence is KFFKRLLKSVRRAVKKFRKKPRLIGLSTLL. Circular dichroism spectroscopy and structure modeling analysis indicated that Hc-CATH mainly assumes an amphipathic α-helical conformation in bacterial membrane-mimetic solutions. It possesses potent broad-spectrum and rapid antimicrobial activity. Meanwhile, it is highly stable and shows low cytotoxicity toward mammalian cells. The microbial killing activity of Hc-CATH is executed through the disruption of cell membrane and lysis of bacterial cells. In addition, Hc-CATH exhibited potent anti-inflammatory activity by inhibiting the LPS-induced production of nitric oxide (NO) and pro-inflammatory cytokines such as TNF-α, IL-1β, and IL-6. Hc-CATH directly binds with LPS to neutralize its toxicity, and it also binds to Toll-like receptor 4 (TLR4/MD2 complex), which therefore inhibits the binding of LPS to TLR4/MD2 complex and the subsequent activation of LPS-induced inflammatory response pathways. Taken together, our study demonstrates that Hc-CATH, the first cathelicidin from sea snake discovered to have both antimicrobial and anti-inflammatory activity, is a potent candidate for the development of peptide antibiotics. 相似文献
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Identification of Campylobacter jejuni and determination of point mutations associated with macrolide resistance using a multiplex TaqMan MGB real‐time PCR
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116.
Kuang H Zhao S Chen W Ma W Yong Q Xu L Wang L Xu C 《Biosensors & bioelectronics》2011,26(5):2495-2499
A novel, rapid DNA detection method based on fluorescence quenching of quantum dots (QDs) by gold nanoparticles (GNPs) through polymerase chain reaction (PCR) was developed. In proof-of-concept experiments, the length of the amplicon DNA ranging from 152 to 1003 base pairs (bp) could be determined based on quenched fluorescence intensity with 136 bp as the lower limit of effective range. And the real sample detections were also achieved successfully by this developed method. Therefore, this DNA detection method has the potential to be the powerful gene diagnostic tool. 相似文献
117.
An all-electron scalar relativistic calculation was performed on Au
n
H2O (n = 1–13) clusters using density functional theory (DFT) with the generalized gradient approximation at PW91 level. The calculation
results reveal that, after adsorption, the small gold cluster would like to bond with oxygen and the H2O molecule prefers to occupy the single fold coordination site. Reflecting the strong scalar relativistic effect, Au
n
geometries are distorted slightly but still maintain a planar structure. The Au–Au bond is strengthened and the H–O bond
is weakened, as manifested by the shortening of the Au–Au bond-length and the lengthening of the H–O bond-length. The H–O–H
bond angle becomes slightly larger. The enhancement of reactivity of the H2O molecule is obvious. The Au–O bond-lengths, adsorption energies, VIPs, HLGs, HOMO (LUMO) energy levels, charge transfers
and the highest vibrational frequencies of the Au–O mode for Au
n
H2O clusters exhibit an obvious odd-even oscillation. The most favorable adsorption between small gold clusters and the H2O molecule takes place when the H2O molecule is adsorbed onto an even-numbered Au
n
cluster and becomes an Au
n
H2O cluster with an even number of valence electrons. The odd–even alteration of magnetic moments is observed in Au
n
H2O clusters and may serve as material with a tunable code capacity of “0” and “1” by adsorbing a H2O molecule onto an odd or even-numbered small gold cluster. 相似文献
118.
Malaria continues to be one of the most devastating global health problems due to the high morbidity and mortality it causes in endemic regions. The search for new antimalarial targets is of high priority because of the increasing prevalence of drug resistance in malaria parasites. Malarial proteases constitute a class of promising therapeutic targets as they play important roles in the parasite life cycle and it is possible to design and screen for specific protease inhibitors. In this mini-review, we provide a phylogenomic overview of malarial proteases. An evolutionary perspective on the origin and divergence of these proteases will provide insights into the adaptive mechanisms of parasite growth, development, infection, and pathogenesis.B. 相似文献
119.
Zhang Y Xu P Lu C Kuang Y Zhang X Cao D Li C Chang Y Hou N Li H Wang S Sun X 《Marine biotechnology (New York, N.Y.)》2011,13(3):376-392
A genetic linkage map of common carp (Cyprinus carpio L.) was constructed using Type I and Type II microsatellite markers and a pseudo-testcross mapping strategy. The microsatellite markers were isolated from microsatellite-enriched genomic libraries and tested for their segregation in a full-sib mapping panel containing 92 individuals. A total of 161 microsatellite loci were mapped into 54 linkage groups. The total lengths of the female, male and consensus maps were 2,000, 946, and 1,852?cM, with an average marker spacing of approximately 13, 7, and 11?cM, respectively. Muscle fiber-related traits, including muscle fiber cross-section area and muscle fiber density, were mapped to the genetic map. Three QTLs for muscle fiber cross-section area and two QTLs for muscle fiber density were identified when considering both significant and suggestive QTL effects. The QTLs with largest effects for muscle fiber cross-section area and muscle fiber density were 21.9% and 18.9%, and they were located in LG3, respectively. 相似文献
120.