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    • 4. 发明授权
    • Bioprocess for preparing 7-ACA and 7-ADAC
    • 用于制备7-ACA和7-ADAC的生物工艺
    • US5559005A
    • 1996-09-24
    • US250310
    • 1994-05-27
    • Michael J. ConderPhyllis C. McAdaJohn A. RambosekChristopher D. Reeves
    • Michael J. ConderPhyllis C. McAdaJohn A. RambosekChristopher D. Reeves
    • C12N1/19C07D501/20C12N1/15C12N9/00C12N9/02C12N9/10C12N15/09C12N15/52C12N15/54C12P20060101C12P35/00C12P35/06C12P37/04C12R1/82C12P35/04C12N1/16
    • C12N9/0071C12N9/00C12N9/1029C12P35/00C12P37/04Y10S435/935
    • Important intermediates for preparing cephalosporin antibiotics, 7-amino-cephalosporanic acid (7-ACA) and 7-aminodeacetylcephalosporanic acid (7-ADAC), are prepared by a novel bioprocess in which a transformed Penicillium chrysogenum strain is cultured in the presence of an adipate feedstock to produce adipoyl-6-APA (6-amino penicillanic acid); followed by the in situ expression of the following genes with which the P. chrysogenum has been transformed:1) an expandase gene, e.g., from Cephalosporium acremonium, whose expression product converts the adipoyl-6-APA by ring expansion to adipoyl-7-ADCA;2) an hydroxylase gene whose expression product converts the 3-methyl side chain of adipoyl-7-ADCA to 3-hydroxymethyl, to give the first product, 7-aminodeacetylcephalosporanic acid (7-ADAC); and3) an acetyltransferase gene whose expression product converts the 3-hydroxymethyl side chain to the 3-acetyloxymethyl side chain of 7-ACA. The final product, 7-ACA, is then prepared by cleavage of the adipoyl side chain using an adipoyl acylase. The entire synthesis, accordingly, is carried out using bioprocesses, and is efficient and economical.
    • 用于制备头孢菌素抗生素,7-氨基头孢菌素酸(7-ACA)和7-氨基脱乙酰头孢菌酸(7-ADAC)的重要中间体是通过新型生物工艺制备的,其中转化的产黄青霉菌株在己二酸存在下培养 生产己二酰-6-APA(6-氨基青霉烷酸)的原料; 其次是产生产黄青霉的以下基因的原位表达:1)扩增酶基因,例如头孢霉头孢菌,其表达产物通过环扩展将己二酰基-6-APA转化为己二酰-7- ADCA; 2)表达产物将己二酰-7-ADCA的3-甲基侧链转化为3-羟甲基的羟化酶基因,得到第一产物7-氨基乙酰基头孢烷酸(7-ADAC); 和3)其表达产物将3-羟甲基侧链转化为7-ACA的3-乙酰氧甲基侧链的乙酰转移酶基因。 然后通过使用己二酰酰化酶裂解己二酰侧链制备最终产物7-ACA。 因此,整个合成使用生物工艺进行,并且是高效和经济的。