Retrobiosynthetic Approach Delineates the Biosynthetic Pathway and the Structure of the Acyl Chain of Mycobacterial Glycopeptidolipids
摘要:
Glycopeptidolipids (GPLs) are dominant cell surface molecules present in several non-tuberculous and opportunistic mycobacterial species. GPLs from Mycobacterium smegmatis are composed of a lipopeptide core unit consisting of a modified C-26-C-34 fatty acyl chain that is linked to a tetrapeptide (Phe-Thr-Ala-alaninol). The hydroxyl groups of threonine and terminal alaninol are further modified by glycosylations. Although chemical structures have been reported for 16 GPLs from diverse mycobacteria, there is still ambiguity in identifying the exact position of the hydroxyl group on the fatty acyl chain. Moreover, the enzymes involved in the biosynthesis of the fatty acyl component are unknown. In this study we show that a bimodular polyketide synthase in conjunction with a fatty acyl-AMP ligase dictates the synthesis of fatty acyl chain of GPL. Based on genetic, biochemical, and structural investigations, we determine that the hydroxyl group is present at the C-5 position of the fatty acyl component. Our retrobiosynthetic approach has provided a means to understand the biosynthesis of GPLs and also resolve the long-standing debate on the accurate structure of mycobacterial GPLs.
[EN] PHOSPHORIC ACID ESTERS AND THEIR USE AS WETTING AND DISPERSING AGENT<br/>[FR] ESTERS D'ACIDE PHOSPHORIQUE ET LEUR UTILISATION COMME AGENT MOUILLANT ET DISPERSANT
申请人:EFKA ADDITIVES B V
公开号:WO2005085261A1
公开(公告)日:2005-09-15
The invention relates to a phosphoric acid ester and salts thereof of the general formula (I), wherein A is a monohydroxyl residue derived from C1-C20-alkyl-(AO)x-OH or Acyl-(AO)x-OH; or C1-C20-alkyl -(AO)x-(HA)y-OH or Acyl-(AO)x-(HA)y-OH; or C1-C20-alkyl -(AO)x-(AA-AO)y-OH or Acyl-(AO)x-(AA-AO)y-OH; or MO -(HA)y-OH or MO-(AA-AO)y-OH; wherein Acyl is an aromatic carboxylic acid residue or a saturated or unsaturated fatty acid residue; AO is a polyC2-C4alkyleneglycol residue, HA is a hydroxycarboxylic acid or a lactone thereof, AA is a dicarboxylic acid, MO is a monoalcohol, x is 1 to 250, y is 1 to 250, B is a mono-, di-, or tri- or polyhydroxy di-, tri or multi-carboxylic acid residue which is linked via the hydroxy group to the phosphoric acid and via one of the carboxylic acid groups to the monohydroxyl residue [A], the remaining carboxyl acid group(s) is/are free or is/are esterified with a further monohydroxyl residue [A], resulting in branched esters; n is 1-2; m is 1-4. The phosphoric acid esters are used as wetting agent or dispersants.
NOVEL ALKANETHIOIC ACID DERIVATIVE AND PERFUME COMPOSITION CONTAINING THE SAME
申请人:T. HASEGAWA CO., LTD.
公开号:US20200290958A1
公开(公告)日:2020-09-17
An alkanethioic acid derivative capable of imparting a characteristic aroma or flavor to fragrances and cosmetics, and foods and beverages; and a perfume composition comprising the alkanethioic acid derivative as an active ingredient. S-alkyl 5-[(1-alkoxy)ethoxy]alkanethioate represented by formula (1), and a perfume composition comprising the S-alkyl 5-[(1-alkoxy)ethoxy]alkanethioate represented by formula (1) as an active ingredient. In the formula (1), R
1
represents an alkyl group having 1 to 9 carbon atoms, R2 represents an alkyl group having 2 to 4 carbon atoms, and R3 represents a methyl group or an ethyl group.
(S)-5-hydroxydecanoic acid and its therapeutic composition
申请人:MOCHIDA PHARMACEUTICAL CO., LTD.
公开号:EP0410446A1
公开(公告)日:1991-01-30
The present invention relates to a compound selected from the group consisting of (S)-5-hydroxydecanoic acid, a salt, a solvate and a solvate of said salt thereof and relates to methods for producing the compound, comprising of inversion of the configuration and also relates to a pharmaceutical composition for treatment of cardiovascular diseases such as arrhythmia and ischemic heart diseases, or diabates.
A dispersant which comprises the reaction product of a phosphating agent such as polyphosphoric acid and a compound of formula R—OH wherein R is a residue of a polyester and/or polyether having a polymerisation terminating group and where the ratio of each phosphorus atom of the phosphating agent to RO—H is from 1.3:1 to 3:1. The dispersants are thought to be pyrophosphates.
[EN] DRUG CONJUGATES<br/>[FR] CONJUGUÉS DE MÉDICAMENT
申请人:UNIV MISSOURI
公开号:WO2009158633A1
公开(公告)日:2009-12-30
Conjugated compounds comprising a therapeutic or diagnostic agent linked to a substrate for a cell membrane transporter or receptor by lipophilic linker are provided.