53 results about "Meticillin resistance" patented technology

The present invention relates to carbocephem antibiotics and pharmaceutically acceptable salts thereof useful for the treatment of bacterial infections, in particular infections caused by methicillin-resistant Staphylococcus spp. bacteria.

Described herein are novel SCCmec right extremity junction (MREJ) sequences for the detection and / or identification of methicillin-resistant Staphylococcus aureus (MRSA). Disclosed are methods and compositions based on DNA sequences for the specific detection of MREJ sequences designated types xi, xii, xiii, xiv, xv, xvi, xvii, xviii, xix, and xx for diagnostic purposes and / or epidemiological typing.

The invention relates to novel methods for using macrolide anti-infective agents. The macrolide anti-infective agents demonstrate antibacterial activity against multi-drug resistant strains of bacteria and, in particular, methicillin-resistant Staphylococcus aureus (MRSA). Methods for inhibiting the activity of multi-drug resistant bacterial organisms and methods for treating a bacterial infection caused by such organisms are described herein.

Method of detecting methicillin-resistant S. aureus (MRSA) and methicillin-sensitive S. aureus (MSSA) in a nucleic acid coamplification assay. The invention advantageously reduces the incidence of false-positive MRSA determinations in real-time assays by requiring satisfaction of a threshold criterion that excludes certain co-infections from the MRSA determination. The invention further provides for determination of MSSA, even when the MSSA is present in combination with methicillin-resistant coagulase-negative (MR-CoNS) bacteria at high or low levels.

A 2-arylmethylazetidine carbapenem derivative of formula (I) or a pharmaceutically acceptable salt thereof exhibits a wide spectrum of antibacterial activities against Gram-positive and Gram-negative bacteria and excellent antibacterial activities against resistant bacteria such as methicillinresistant Staphylococcus aureus (MRSA) and quinolone-resistant strains (QRS).

The invention provides the application of pogostone or derivatives of the pogostone in preparation of antibacterial health food, food, cosmetics, sanitizers or daily chemical products. The invention further provides an antibacterial health food, food, a cosmetic, a sanitizer or a daily chemical product. The pogostone has favorable inhibitory activity to staphylococcus and other pathogenic bacteria or conditioned pathogen, can be used for effective treatment of bacterial infections, and can be effectively against methicillin-resistant drug-resistance bacteria, so that a new choice for clinical medication is provided.

Disclosed is a novel family of antibiotic that provides bacteria specific targeting, activation and the ability to prevent bacteria mutations that result in bacteria resistance. The compositions and methods of the invention provide for an antibiotic that is effective against Methicillin-resistant Staphylococcus aureus (MRSA).

The invention particularly relates to an application of clemastine fumarate in an anti-MRSA preparation. The MRSA has high toxicity, shows drug resistance to most clinically common antibiotic drugs, is widely distributed in a daily environment, and is a troublesome pathogenic strain. In order to develop an active substance with an inhibition effect on the drug-resistant bacteria, the invention screens and verifies that the clemastine fumarate has a good inhibition effect on MRSA from clinical drugs, and is expected to be applied to the development of anti-MRSA infection related drugs.

The invention discloses a cyclic hexapeptide compound desotamide A4 and an application thereof in preparation of antibacterial drugs. The structural formula of the compound desotamide A4 is as shown in formula (I) . The cyclic hexapeptide desotamide A4 disclosed by the invention has a broad-spectrum anti-gram pathogenic bacterium effect. The test result shows that the desotamide A4 has good inhibitory activity (MIC is 8-32 [mu] g / mL) on a plurality of clinical drug-resistant staphylococcus aureus, enterococcus faecalis, micrococcus luteus, bacillus subtilis, simulated staphylococcus and staphylococcus haemolyticus including methicillin-resistant staphylococcus aureus; compared with an unmodified parent natural cyclic peptide compound desotamide A, the activity of the cyclic hexapeptide desotamide A4 disclosed by the invention is enhanced by 2-4 times, and the cyclic hexapeptide desotamide A4 has an important value in research and development of antibacterial drugs.

The present invention relates to a novel antimicrobial compound of lactoquinomycin that is highly effective against many antibiotic-resistant gram-positive bacteria; namely, methicillin-resistant and vancomycin-resistance Staphylococcus aureus, vancomycin-resistant Enterococcus faecilis and Mycobacteria. The present invention also relates to a fermentation process of culturing a Streptomyces strain to prepare the antimicrobial compound and its use in killing the antibiotic-resistant bacteria.

Carbacephem β-lactam antibiotics having the following chemical structures (I) and (II) are disclosed:including stereoisomers, pharmaceutically acceptable salts, esters and prodrugs thereof, wherein Ar2, R1, R2 and R3 are as defined herein. The compounds are useful for the treatment of bacterial infections, in particular those caused by methicillin-resistant Staphylococcus spp.

The present invention discloses 5-arylamino quinolyl-7, 8-dione derivative with the chemical structure expression as shown. The present invention also relates to the synthesis and application in preparing antibiotic medicine, especially medicine for antagonizing methicillin resisting Staphylococcus aureus (MRSA), of the derivative. Experiment shows that the 5-arylamino quinolyl-7, 8-dione derivative has obvious bacteriostasis effect on some Gram positive bacteria, especially on methicillin resisting Staphylococcus aureus (MRSA), and may be used in preparing effective antibiotic medicine.

The invention discloses a method for rapidly preparing a Fascaplysin derivative through a Suzuki-Miyaura coupling reaction and an application of the Fascaplysin derivative in resisting methicillin-resistant staphylococcus aureus (MRSA ATCC43300), and particularly discloses a method for rapidly preparing the Fascaplysin derivative through the Suzuki-Miyaura coupling reaction. The preparation method comprises the following steps: (1) carrying out regioselective Suzuki-Miyaura coupling on phenylboronic acid or heterocyclic boronic acid with different substituent groups and a dihalo-substituted raw material substrate, so as to obtain a series of Fascaplysin derivative precursor compound beta-carboline; and (2) carrying out intramolecular ring closing reaction on beta-carboline through high-temperature reaction, so as to obtain a series of Fascaplysin derivatives. According to the preparation method disclosed by the invention, a Fascaplysin derivative compound library with structural diversity can be quickly and efficiently constructed, and compared with the traditional Fascaplysin derivative synthesis, the preparation time is greatly shortened, and the synthesis efficiency is improved. The synthesized Fascaplysin derivative shows strong antibacterial activity, inhibits the formation of a biological membrane, and is an antibacterial drug candidate compound with a good application prospect.

The invention provides a nano antibody targeting a methicillin-resistant staphylococcus LspA protein as well as a preparation method and application of the nano antibody. The provided nano antibody mainly recognizes a binding motif region combined with the methicillin-resistant staphylococcus LspA, and comprises a framework region FR and complementary determining regions CDR1, CDR2 and CDR3. One specific amino acid sequence of the nano antibody is SEQ ID NO: 1. The nano antibody disclosed by the invention can be efficiently and specifically combined with methicillin-resistant staphylococcus LspA protein, and the affinity can reach a nanomole level; and meanwhile, the nano antibody provided by the invention can obtain an excellent effect in methicillin-resistant staphylococcus detection or diseases caused by methicillin-resistant staphylococcus, and can be applied to the fields of biology and medicine.

The invention discloses a rhubarb acid ester derivative in the field of antibiotic compounds. The chemical structural formula of rhubarb acid ester is as shown in the formula (II), the formula (II) isshown in the description, wherein R is a chain substituent group of 1-5 carbon atoms or a naphthenic base or an aromatic hydrocarbon group of 3-6 carbon atoms. An antibiotic activity test proves thatthe rhubarb acid ester derivative with the novel structure has the antibiotic activity on methicillin-resistant staphylococcus aureus (MRSA). A plurality of targets have the outstanding antibiotic effect on methicillin-resistant staphylococcus aureus (MRSA), are superior to the reference drug oxacillin and is close to the reference drug vancomycin, and the rhubarb acid ester derivative can be served as a candidate compound to resist methicillin-resistant staphylococcus aureus (MRSA) and be researched.

A beta-lactam compound of the formula:wherein R1 is lower alkyl or OH-substituted lower alkyl, R2 is H or lower alkyl, X is O, S or NH, n is 1 to 3, R3 is -C(Ra)=NH (Ra is H, lower alkyl or substituted lower alkyl), or a salt thereof, or an ester thereof. These compounds show excellent antibacterial activity against Gram-positive bacteria, particularly against methicillin-resistant Staphylococci and methicillin-resistant and coagulase-negative Staphylococci.

Novel beta-lactam compound of the formula [1]:wherein R1 is lower alkyl or hydroxy-substituted lower alkyl, R2 is H or lower alkyl, X is O or, S, R3 is H, metal or protecting group, W is a 6- or 7-membered nitrogen-containing heterocycle optionally being substituted at carbon atoms. Said beta-lactam compound shows excellent antibacterial activity against Gram-positive bacteria, particularly against methicillin-resistant Staphylococcus aureus and methicillin-resistant and coagulase-negative Staphylococcus aureus.

The invention aims to provide a component of an inclusion compound capable of increasing the antibacterial activity of vancomycin and a preparation method. The inclusion compound is formed by taking a beta-cyclodextrin derivative, i.e., 6-[(L-phenylalanyl)-amino]-beta-cyclodextrin as a host compound and taking vancomycin as a guest compound. As proved by an in-vitro antibacterial activity experiment of the inclusion compound, vancomycin has the efficacy-enhancing effect of 4-8 times of minimum bacteriostasis solubility on the antibacterial activities of multiple bacterium strains, particularly methicillin resistant staphylococcus aureus (MRSA). The bacterium-resisting and efficacy-enhancing mechanisms of the inclusion compound formed by vancomycin and 6-[(L-phenylalanyl)-amino]-beta-cyclodextrin are explained by performing a 1HNMR (1h Nuclear Magnetic Resonance) experiment, analyzing the chemical structural conformation of the inclusion compound and combining the original biochemical acting mechanism of the antibacterial activity of vancomycin. The inclusion compound for increasing the antibacterial activity of vancomycin can be applied to antibacterial treatment of pathogenic bacteria which are insensitive to vancomycin or have low antibacterial activities. The component can be developed into a novel vancomycin synergistic agent for constituting a novel medicament together with vancomycin.

The invention discloses an emaclamycin and its preparation method and application. The said emaclamycin is derived from the liquid fermentation product of the endophytic actinomycete Amycolatopsis sp.HCa4 in the intestinal tract of migratory locust, including emaclamycin A or emaclamycin B. Experimental results show that emaclamycin has strong antibacterial activity against methicillin-resistant Staphylococcus aureus and strong cytotoxic activity against human breast cancer cell M231, and can be prepared into a new type of anti-tumor lead compound, to a certain extent Overcome the shortcomings of existing antibiotic resistance.

The invention discloses a polypeptide compound with broad-spectrum bactericidal activity on gram-positive bacteria. The polypeptide compound is formed by combining polypeptides with sequences shown in SEQ ID No.1 and SEQ ID No.2. The polypeptide compound with broad-spectrum bactericidal activity on gram-positive bacteria is derived from standard sensitive staphylococcus aureus (ATCC 29213). The polypeptide compound disclosed by the invention has broad-spectrum bactericidal activity on gram-positive bacteria and has a killing effect on methicillin-resistant bacteria and vancomycin-resistant bacteria which are difficultly killed by antibiotics.

The invention relates to a method for detection of a methicillin resistant coagulase positive Staphylococcus aureus (MRSA) strain by means of a sequence specific amplification reaction.