| ²é¿´: 3832 | »Ø¸´: 11 | |||
| µ±Ç°Ö»ÏÔʾÂú×ãÖ¸¶¨Ìõ¼þµÄ»ØÌû£¬µã»÷ÕâÀï²é¿´±¾»°ÌâµÄËùÓлØÌû | |||
[½»Á÷]
µ°°×ÖʵÄ̼¶ËºÍµª¶Ë
|
|||
|
Çë½Ì¸÷λ´óÏÀ£¬µ°°×ÖʵÄ̼¶ËºÍµª¶ËÄѵÀÊÇÓɺܶà¸ö°±»ùËá×é³ÉµÄÂ𣿠ÎÒÊÇÒ»¸ö¸Õ¿ªÊ¼½Ó´¥·Ö×ÓÉúÎïѧµÄ²ËÄñ£¬×î½ü¿´ÂÛÎĽ²ÐÞÊÎc-terminal domain£¬Ã»Ì«Ã÷°×ÊÇʲôÒâ˼¡£ Polytopic membrane proteins are essential for cellular uptake and release of nutrients. To prevent toxic accumulation, rapid shut-off mechanisms are required. Here we show that the soluble cytosolic carboxy terminus of an oligomeric ammonium transporter from Arabidopsis thaliana serves as an allosteric regulator essential for function; mutations in the C-terminal domain, conserved between bacteria, fungi and plants, led to loss of transport activity. When co-expressed with intact transporters, mutants inactivated functional subunits, but left their stability unaffected. Co-expression of two inactive transporters, one with a defective pore, the other with an ablated C terminus, reconstituted activity. The crystal structure of an Archaeoglobus fulgidus ammonium transporter (AMT)1 suggests that the C terminus interacts physically with cytosolic loops of the neighbouring subunit. Phosphorylation of conserved sites in the C terminus2 are proposed as the cognate control mechanism. Conformational coupling between monomers provides a mechanism for tight regulation, for increasing the dynamic range of sensing and memorizing prior events, and may be a general mechanism for transporter regulation. ÎÒÏë×ÉѯÏÂC-terminal °üº¬ºÜ¶à°±»ùËáÂ𣿠²»ÊÇÖ¸µÄµ°°×ÖÊÄ©¶ËµÄôÈ»ù£¿ Ĥµ°°×µÄC terminal ÊDz»ÊÇ¿ÉÒÔÑÓÉìµ½cytosolÀïºÜ³¤£¿ Co-expression of two inactive transporters, one with a defective pore, the other with an ablated C terminus, reconstituted activity. Õâ¾ä»°Ã»ÓÐÃ÷°×ÊÇʲôÒâ˼£¬ÔõôinactiveµÄÁ½¸öµ°°×Ò»Æð±í´ï¾ÍÓÐÁË»îÐÔÁË£¿ |
» ²ÂÄãϲ»¶
Ò»Ö¾Ô¸ÏÃÃÅ´óѧ»¯Ñ§Ñ§Ë¶307Çóµ÷¼Á
ÒѾÓÐ4È˻ظ´
²ÄÁÏѧ˶297ÒѹýËÄÁù¼¶Çóµ÷¼ÁÍÆ¼ö
ÒѾÓÐ13È˻ظ´
Ò»Ö¾Ô¸ Î÷±±´óѧ ×Ü·Ö282 Ó¢ÓïÒ»62 Çóµ÷¼Á
ÒѾÓÐ6È˻ظ´
Ò»Ö¾Ô¸ Î÷±±´óѧ £¬070300»¯Ñ§Ñ§Ë¶£¬×Ü·Ö287£¬Ë«·ÇÒ»±¾£¬Çóµ÷¼Á¡£
ÒѾÓÐ5È˻ظ´
0856Çóµ÷¼Á
ÒѾÓÐ9È˻ظ´
Ò»Ö¾Ô¸ ÄϾ©Óʵç´óѧ 288·Ö ²ÄÁÏ¿¼ÑÐ Çóµ÷¼Á
ÒѾÓÐ3È˻ظ´
²ÄÁÏÓ뻯¹¤304ÇóBÇøµ÷¼Á
ÒѾÓÐ5È˻ظ´
Ò»Ö¾Ô¸±±¾©»¯¹¤´óѧ²ÄÁÏÓ뻯¹¤£¨085600£©296Çóµ÷¼Á
ÒѾÓÐ5È˻ظ´
275Çóµ÷¼Á
ÒѾÓÐ7È˻ظ´
274Çóµ÷¼Á
ÒѾÓÐ19È˻ظ´
» ±¾Ö÷ÌâÏà¹ØÉ̼ÒÍÆ¼ö: (ÎÒÒ²ÒªÔÚÕâÀïÍÆ¹ã)
» ±¾Ö÷ÌâÏà¹Ø¼ÛÖµÌùÍÆ¼ö£¬¶ÔÄúͬÑùÓаïÖú:
¼±Çó£¡ÊèË®¶àëÄ»òÊèË®ÐÔµ°°×
ÒѾÓÐ9È˻ظ´
µ°°×Öʵȵçµã¼ÆËã ÌâÄ¿½â´ð
ÒѾÓÐ35È˻ظ´
ÇóÖú£¬ÎïÀíÑо¿ÉúµÄרҵѡÔñ
ÒѾÓÐ26È˻ظ´
ʲô½ÐC¶Ë¸ß¶È±£ÊØ£¿
ÒѾÓÐ4È˻ظ´
¡¾ÇóÖú¡¿¹ØÓڿʽ¶¨µª·¨²âº¬µªÁ¿
ÒѾÓÐ8È˻ظ´
Î÷±±Å©ÁֿƼ¼´óѧ2010Äê¹ú¼Ò×ÔÈ»¿ÆÑ§»ù½ð»ñÅúÃûµ¥
ÒѾÓÐ104È˻ظ´
Ö»ÄÜÀûÓÃÆÏÌÑÌÇ£¨µ¥ÌÇ£©µÄ½Íĸ£¬²»ÄÜÀûÓÃÕáÌÇ»ò¶àÌÇ¡¢
ÒѾÓÐ5È˻ظ´
¡¾·ÖÏí¡¿¡¼Ãû´Ê½âÊÍ¡½ÉúÎﻯѧÃû´Ê½âÊÍ
ÒѾÓÐ14È˻ظ´
» ÇÀ½ð±ÒÀ²£¡»ØÌû¾Í¿ÉÒԵõ½:
94ÄêÅ®Õ÷ÄÐÓÑ
+1/270
Öйú¿ÆÑ§ÔºÇൺÉúÎïÄÜÔ´Óë¹ý³ÌÑо¿Ëù ÕÐÉú2-3ÃûÁªÅàÉú
+1/180
ɽ¶«½¨Öþ´óѧ £¨ÊÐÕþÓë»·¾³¹¤³ÌѧԺ£©Ë¶Ê¿Ñо¿ÉúÕÐÉúÀ² ¾²µç·ÄË¿ÏËάÓëÑÎË®·ÖÀëÓ¦ÓÃ
+1/90
º¸½ÓרҵӦ½ì±ÏÒµÉúÕÐÆ¸
+1/87
ÕÐÊÕ²ÄÁÏÓ뻯ѧÏà¹Ø×¨ÒµË¶Ê¿Ñо¿Éú
+1/80
Î÷ÄϽ»Í¨´óѧҽѧԺÕÐÊÕÉúÎïҽѧ¹¤³ÌºÍ²ÄÁÏÓ뻯¹¤×¨ÒµË¶Ê¿Ñо¿Éú
+1/77
»¶Ó»·¾³¿ÆÑ§Ó빤³Ì¡¢Ë®Àû¹¤³ÌרҵÑо¿Éú¼ÓÈ뱱ʦ´óÖéº£Ð£Çø¶Ô½¿ÎÌâ×é
+2/62
ÄÏ·½ÓÍУ¡ª¡ª×ÊÔ´Óë»·¾³×¨Ë¶ÕÐÉú£¬»¯Ñ§»·¾³ÉúÎïÀàרҵ¾ù¿É£¬¾ÍÒµºÃ£¬ÓÐרҵ±ÚÀÝ
+1/48
2026 ÎïÀí·½ÏòÕÐÊÕ²¿·Öµ÷¼Á
+1/33
Î÷»ª´óѧ²ÄÁÏѧԺ±íÃæ¿ÆÑ§Ó빤³Ì¼¼Êõ¿ÆÑÐÍŶÓ2026ÄêÕÐÊÕÑо¿Éú
+1/33
ÕÐÊÕÓ«¹â̽Õë/ÓлúºÏ³É/ÉúÎïѧ ²©Ê¿ºó--н½ð: 30Íò-50Íò
+1/28
°Ä´óÀûÑÇÀ¥Ê¿À¼´óѧ»¯¹¤Ñ§ÔºÕÐÊÕÈ«½±²©Ê¿Éú2Ãû
+1/28
ÉϺ£ÖÐÒ½Ò©´óѧ´´ÐÂÖÐÒ©Ñо¿Ôº ÕÐÊÕÉóºËÖÆ²©Ê¿ÉúÒ»Ãû
+1/18
²©Ê¿ÕÐÉú | Çൺ¿Æ¼¼´óѧ£¨¸ß·Ö×Ó¡¢»¯Ñ§¡¢²ÄÁÏ¡¢Á¦Ñ§¡¢»úµç¹¤³Ì¡¢¼ÆËã»ú·ÂÕæ£©
+1/18
˫һÁ÷´óÑ§ÏæÌ¶´óѧ¡°»¯¹¤¹ý³ÌÄ£ÄâÓëÇ¿»¯¡±¹ú¼ÒµØ·½ÁªºÏ¹¤³ÌÑо¿ÖÐÐÄÕÐÊÕ²©Ê¿Éú
+1/17
°ëµ¼Ìå¹âµç×ÓÆ÷¼þÓ뼯³É
+1/5
»¯Ñ§¹¤³ÌÓë¼¼Êõ ¹ú¼Ò˫һÁ÷ѧ¿Æ 211¸ßУ ¹ú¼ÒÖØµãʵÑéÊÒ ²©Ê¿Ñо¿Éú
+1/4
Äþ²¨¶«·½Àí¹¤´óѧÓàÅô¿ÎÌâ×é2026ÄêÉϺ£½»´óÁªÅ಩ʿÉú¡¢²©Ê¿ºó¡¢¿ÆÑÐÖúÀíÕÐÆ¸
+1/3
Å·ÖÞÊÖÐÔ¹âÆ×·½ÏòROA/CPL/Raman imagingÕÐÊÕ²©Ê¿Ñо¿Éú¼°ÁªºÏÅàÑøÉú£¨²¼À¸ñ£©
+1/2
Äϲýº½¿Õ´óѧÄâÕÐÊÕ·ÉÐÐÆ÷Éè¼Æ»ò¼ÆËãÁ÷ÌåÁ¦Ñ§Ñо¿·½Ïò²©Ê¿Éú 1Ãû
+1/1
jurkat.1640
ÖÁ×ðľ³æ (ÎÄ̳¾«Ó¢)
- BioEPI: 2
- Ó¦Öú: 908 (²©ºó)
- ½ð±Ò: 17174
- Ìû×Ó: 14525
- ÔÚÏß: 2184.8Сʱ
- ³æºÅ: 514340
10Â¥2014-02-12 15:17:27
cicelyzh
Ìú¸Ëľ³æ (Ö°Òµ×÷¼Ò)
- BioEPI: 4
- Ó¦Öú: 1662 (½²Ê¦)
- ½ð±Ò: 8693.8
- Ìû×Ó: 3516
- ÔÚÏß: 456Сʱ
- ³æºÅ: 1614001
¡ï ¡ï ¡ï
sunny¾²(½ð±Ò+1): лл²ÎÓë
wizardfan: ½ð±Ò+2, лл²ÎÓë 2014-02-13 09:22:53
sunny¾²(½ð±Ò+1): лл²ÎÓë
wizardfan: ½ð±Ò+2, лл²ÎÓë 2014-02-13 09:22:53
|
Äã²»ÄܶÏÕÂÈ¡Ò壬ÎÄÕÂÀï˵µÄÊÇc-terminal domain£¬Ö¸µÄÊÇC¶Ë½á¹¹Óò¡£½á¹¹Óòµ±È»Óкܶఱ»ùËá²Ð»ù¡£ ÎÄÕÂÊÇ˵Õâ¸ötransporterµÄC¶Ë½á¹¹¶Ô¹¦ÄܺÜÖØÒª£¬Èç¹ûûÓÐC¶Ë½á¹¹Óò£¬transporterÊÇÎÞ¹¦Äܵġ£Èç¹û¹²±í´ïʧ»îporeµÄtransporter£¬¿ÉÒÔÐγÉÓй¦ÄܵÄtransporter. |
6Â¥2014-01-10 13:12:49
Davidzjy
Ìú¸Ëľ³æ (ÕýʽдÊÖ)
- BioEPI: 1
- Ó¦Öú: 209 (´óѧÉú)
- ½ð±Ò: 6632.3
- Ìû×Ó: 965
- ÔÚÏß: 393.2Сʱ
- ³æºÅ: 1887475
7Â¥2014-01-10 13:52:17
¼òµ¥»Ø¸´
chenyh7189Â¥
2014-01-11 20:20
»Ø¸´
sunny¾²(½ð±Ò+1): лл²ÎÓë
1 [ ·¢×ÔÊÖ»ú°æ http://muchong.com/3g ]













»Ø¸´´ËÂ¥