²é¿´: 697  |  »Ø¸´: 2
±¾Ìû²úÉú 1 ¸ö ·­ÒëEPI £¬µã»÷ÕâÀï½øÐв鿴

wd519wd706

Òø³æ (СÓÐÃûÆø)


[½»Á÷] ·­Òë¼±Ó㬷dz£¸ÐлÄãµÄ°ïÖú£¡£¡£¡£¡

Expression of a Bacillus Phytase C Gene in Pichia pastoris and
Properties of the Recombinant Enzyme


The cloning and expression of a native gene encoding a Bacillus subtilis phytase using Pichia pastoris as the host is described. In addition, the influence of N-glycosylation on the biochemical properties of the B. subtilis phytase, the influence of pH on the thermostability of the recombinant and native B. subtilis phytases, and the resistance of both phytases to shrimp digestive enzymes and porcine trypsin are also described. After 48 h of methanol induction in shake flasks, a selected recombinant strain produced and secreted 0.82 U/ml (71mg/liter) recombinant phytase. This phytase was N-glycosylated, had a molecular mass of 39 kDa after N-deglycosylation, exhibited activity within a pH range of 2.5 to 9 and at temperatures of 25 to 70¡ãC, had high residual activity (85%  2%) after 10 min of heat treatment at 80¡ãC and pH 5.5 in the presence of 5 mM CaCl2,
and was resistant to shrimp digestive enzymes and porcine trypsin. Although the recombinant Bacillus phytase had pH and temperature activity profiles that were similar to those of the corresponding nonglycosylated native phytase, the thermal stabilities of the recombinant and native phytases were different, although both were calcium concentration and pH dependent

» ²ÂÄãϲ»¶

» ÇÀ½ð±ÒÀ²£¡»ØÌû¾Í¿ÉÒԵõ½:

²é¿´È«²¿É¢½ðÌù

ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
3£®Ç¿ÖÆ×îµÍÐüÉÍ£º
ÿ100´Ê£¨Ó¢ÎÄÔ­ÎÄ£©²»µÍÓÚ15½ð±Ò£»
Â¥Ö÷ÓÐ209¸öµ¥´ÊŶ¡£¡£¡£
2Â¥2010-11-12 13:12:08
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

wangyan820

½ð³æ (СÓÐÃûÆø)


wd519wd706(½ð±Ò+8, ·­ÒëEPI+1):¸ÐлÄã 2010-11-14 00:24:45
±¾ÎÄÃèÊöÁËÒԱϳà½ÍĸΪËÞÖ÷µÄ¿Ý²Ý¸Ë¾úÖ²Ëáø»ùÒò¿Ë¡ºÍ±í´ï¡£Í¬Ê±±¾ÎÄ»¹ÃèÊöÁËN-ÌÇ»ù»¯¶Ô¿Ý²Ý¸Ë¾úÖ²ËáøÉú»¯ÐÔÖʵÄÓ°Ï죬pHÖµ¶ÔÌìÈ»¿Ý²Ý¸Ë¾úÖ²ËáøºÍÖØ×éøµÄÓ°Ï죬ÒÔ¼°Á½ÖÖø¶Ô¿¹Ïû»¯Ã¸ºÍÖíÒȵ°°×øµÄ»îÐÔ¡£ÔÚÒ¡Æ¿ÖнþÅݼ״¼48 hºó£¬ÌôÑ¡³öµÄÖØ×é¾úÖÖ²úÉú²¢·ÖÃÚ³öÁË0.82 U/ml(71mg/Éý)µÄÖØ×éø¡£ÕâÖÖÖ²ËáøÊÇN-ÌÇ»ù»¯µÄ£¬N-È¥ÌÇ»ù»¯ºóµÄ·Ö×ÓÁ¿Îª39 kDa£¬ÔÚpH2.5 µ½ 9ºÍ25 µ½70¡ãCϱíÏÖ³öÁË»îÐÔ£¬ÔÚ80¡ãCÏÂ10·ÖÖÓ¡¢pH 5.5ºÍ5 mM CaCl2´æÔÚϵĻîÐÔΪ85%   2%£¬ÇÒ¶ÔÏû»¯Ã¸ºÍÖíÒȵ°°×øÊÇÓжԿ¹×÷Óõġ£¾¡¹ÜÖØ×é¿Ý²Ý¸Ë¾úÖ²ËáøÔÚÏàͬpHÖµºÍζÈϵÄδÌÇ»ù»¯µÄÌìȻֲËáøÏàËÆ£¬µ«ÊÇÈÈÎȶ¨ÐÔ²¢²»Ïàͬ£¬¾¡¹Ü¶¼Îª¸ÆÅ¨¶ÈºÍpHÒÀÀµÐÔ¡£
3Â¥2010-11-12 14:26:08
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
Ïà¹Ø°æ¿éÌø×ª ÎÒÒª¶©ÔÄÂ¥Ö÷ wd519wd706 µÄÖ÷Ìâ¸üÐÂ
×î¾ßÈËÆøÈÈÌûÍÆ¼ö [²é¿´È«²¿] ×÷Õß »Ø/¿´ ×îºó·¢±í
[¿¼ÑÐ] Ò»Ö¾Ô¸ Î÷±±´óѧ £¬070300»¯Ñ§Ñ§Ë¶£¬×Ü·Ö287£¬Ë«·ÇÒ»±¾£¬Çóµ÷¼Á¡£ +4 ³¿»èÏßÓëÐǺ£ 2026-03-19 4/200 2026-03-20 22:15 by JourneyLucky
[¿¼ÑÐ] 350Çóµ÷¼Á +5 weudhdk 2026-03-19 5/250 2026-03-20 22:04 by luoyongfeng
[¿¼ÑÐ] Ò»Ö¾Ô¸ÖÐÄÏ»¯Ñ§£¨0703£©×Ü·Ö337Çóµ÷¼Á +8 niko- 2026-03-19 9/450 2026-03-20 21:57 by luoyongfeng
[¿¼ÑÐ] ±±¿Æ281ѧ˶²ÄÁÏÇóµ÷¼Á +5 tcxiaoxx 2026-03-20 5/250 2026-03-20 21:35 by laoshidan
[¿¼ÑÐ] Ò»Ö¾Ô¸ÎäÀí²ÄÁϹ¤³Ì348Çóµ÷¼Á +3 £þ^£þ©bº¹ 2026-03-19 4/200 2026-03-20 21:01 by zhukairuo
[¿¼ÑÐ] 281Çóµ÷¼Á£¨0805£© +14 ÑÌÏ«Ò亣 2026-03-16 25/1250 2026-03-20 15:47 by yuncha
[¿¼ÑÐ] ÄÜÔ´²ÄÁÏ»¯Ñ§¿ÎÌâ×éÕÐÊÕ˶ʿÑо¿Éú8-10Ãû +5 ÍÑÓ±¶ø³ö 2026-03-16 14/700 2026-03-20 09:30 by kkcoco25
[¿¼ÑÐ] ±¾¿ÆÖ£ÖÝ´óѧÎïÀíѧԺ£¬Ò»Ö¾Ô¸»ª¿Æ070200ѧ˶£¬346Çóµ÷¼Á +4 ÎÒ²»ÊÇÒ»¸ù´Ð 2026-03-18 4/200 2026-03-19 09:11 by ¸¡ÔÆ166
[¿¼ÑÐ] 0703»¯Ñ§µ÷¼Á£¬Çó¸÷λÀÏʦÊÕÁô +10 ÇïÓÐľ±± 2026-03-14 10/500 2026-03-19 05:52 by anny19840123
[¿¼ÑÐ] 328Çóµ÷¼Á£¬Ó¢ÓïÁù¼¶551£¬ÓпÆÑо­Àú +3 ÉúÎ﹤³Ìµ÷¼Á 2026-03-17 7/350 2026-03-18 20:41 by Wangjingyue
[¿¼ÑÐ] Ò»Ö¾Ô¸ÎäÀí²ÄÁÏ305·ÖÇóµ÷¼Á +5 ÏëÉϰ¶µÄÀðÓã 2026-03-18 6/300 2026-03-18 17:53 by Î޼ʵIJÝÔ­
[¿¼ÑÐ] 08¹¤¿Æ 320×Ü·Ö Çóµ÷¼Á +5 À滨çóÍí·ç 2026-03-17 5/250 2026-03-18 14:49 by haxia
[¿¼ÑÐ] 280Çóµ÷¼Á +6 ¹¾ààÏþÏþ 2026-03-18 7/350 2026-03-18 11:25 by Î޼ʵIJÝÔ­
[¿¼ÑÐ] ¿¼Ñл¯Ñ§Ñ§Ë¶µ÷¼Á£¬Ò»Ö¾Ô¸985 +4 ÕÅvvvv 2026-03-15 6/300 2026-03-17 17:15 by ruiyingmiao
[¿¼ÑÐ] ²ÄÁϹ¤³Ìר˶274Ò»Ö¾Ô¸211Çóµ÷¼Á +6 Ñ¦ÔÆÅô 2026-03-15 6/300 2026-03-17 11:05 by ѧԱh26Tkc
[¿¼ÑÐ] ¿¼Ñе÷¼Á +3 ä¿ya_~ 2026-03-17 5/250 2026-03-17 09:25 by Winj1e
[¿¼ÑÐ] 326Çóµ÷¼Á +4 ŵ±´¶û»¯Ñ§½±êéê 2026-03-15 7/350 2026-03-16 17:11 by ŵ±´¶û»¯Ñ§½±êéê
[¿¼ÑÐ] ÖпÆÔº²ÄÁÏ273Çóµ÷¼Á +4 yzydy 2026-03-15 4/200 2026-03-16 15:59 by Gaodh_82
[¿¼ÑÐ] 070303 ×Ü·Ö349Çóµ÷¼Á +3 LJY9966 2026-03-15 5/250 2026-03-16 14:24 by xwxstudy
[¿¼ÑÐ] 085601²ÄÁϹ¤³Ì315·ÖÇóµ÷¼Á +3 yang_0104 2026-03-15 3/150 2026-03-15 10:58 by peike
ÐÅÏ¢Ìáʾ
ÇëÌî´¦ÀíÒâ¼û