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Addition of the amino acids threonine,serine,proline,and arginine to fermentations of the fungus Glarea lozoyensis influenced both the pneumocandin titer and the spectrum of analogues produced. Addition of threonine or serine altered the levels of the ¡°serine analogues¡± of pneumocandin B0 and B5 and allowed for their isolation and identification. Proline supplementation resulted in a dose-dependent increase in the levels of pneumocandin B0 and E0, whereas pneumocandin C0 and D0 decreased as a function of proline level. Moreover, proline supplementation resulted in an overall increase in the synthesis of both trans-3- and trans-4-hydroxyproline while maintaining a low trans-4-hydroxyproline to trans-3-hydroxyproline ratio compared to the unsupplemented culture. pneumocandin production and the sythesis of hydroxyprolines was also affected by addition of the proline-related amino acid arginine but not by the addition of glutamine or ornithine.Zinc,cobalt,copper,and nickel,trace elements that are known to inhibit ¦Á-ketoglutarate-dependent dioxygenases, affected the pneumocandin B0 titer and altered the levels of pneumocandins B1, B2£¬B5£¬B6£¬and E0£¬analogues that possess altered proline,ornithine,and tyrosine hydroxylation patterns.

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yufu0522: ½ð±Ò+15, ·­ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú, лл£¡ 2012-07-19 20:08:52
°®ÓëÓêÏÂ: ½ð±Ò+1 2012-07-21 12:46:17
sltmac: ½ð±Ò+15, ·­ÒëEPI+1 2012-08-19 08:18:45
Addition of the amino acids threonine,serine,proline,and arginine to fermentations of the fungus Glarea lozoyensis influenced both the pneumocandin titer and the spectrum of analogues produced.
ÔÚÕæ¾úGlarea lozoyensis£¨¾úÖÖ£¬×¨ÒµÃû´Ê£©ÖÐÌí¼ÓËÕ°±Ëᡢ˿°±Ëá¡¢¸¬°±ËáºÍ¾«°±Ëá»áÓ°Ïìpneumocandin£¨×¨ÒµÃû´Ê£¬ÊÇ¿¨²´·Ò¾»Ç°Ì壩µÎ¶ÈºÍ²úÉúµÄÀàËÆÎï¹âÆ×¡£
Addition of threonine or serine altered the levels of the ¡°serine analogues¡± of pneumocandin B0 and B5 and allowed for their isolation and identification.
Ìí¼ÓËÕ°±ËáºÍË¿°±Ëá¸Ä±äpneumocandinB0ºÍB5µÄ¡°Ë¿°±ËáÀàËÆÎµÄˮƽ²¢Ó°Ïì·ÖÀëºÍ¼ø±ð¡£
Proline supplementation resulted in a dose-dependent increase in the levels of pneumocandin B0 and E0, whereas pneumocandin C0 and D0 decreased as a function of proline level. Ìí¼Ó²¹³ä¸¬°±Ëáµ¼ÖÂpneumocandinB0ºÍE0Ë®Æ½Ëæ¸¬°±Ëá¼ÁÁ¿Ôö¼Ó¶øÔö¼Ó£¬È»¶øpneumocandinC0ºÍD0½µµÍ¡£
Moreover, proline supplementation resulted in an overall increase in the synthesis of both trans-3- and trans-4-hydroxyproline while maintaining a low trans-4-hydroxyproline to trans-3-hydroxyproline ratio compared to the unsupplemented culture.
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pneumocandin production and the sythesis of hydroxyprolines was also affected by addition of the proline-related amino acid arginine but not by the addition of glutamine or ornithine.
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Zinc,cobalt,copper,and nickel,trace elements that are known to inhibit ¦Á-ketoglutarate-dependent dioxygenases, affected the pneumocandin B0 titer and altered the levels of pneumocandins B1, B2£¬B5£¬B6£¬and E0£¬analogues that possess altered proline,ornithine,and tyrosine hydroxylation patterns.
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