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KRAS ½á¹¹ÊÇʲô

2023-12-04
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KRASÂѰװüÀ¨4¸ö½á¹¹Óò ¡£KRASÂѰ×ÓÉ6Ìõ¦Â-ÕÛµþÁ´ºÍ5Ìõ-ÂÝÐý½á¹¹×é³É £¬ÐγÉÁ½¸öÖ÷Òª½á¹¹Óò£ºG½á¹¹ÓòºÍC¶Ë½á¹¹Óò ¡£

KRAS protein contains 4 domains.KRAS protein is made up of 6 beta-strands and 5 alpha-helicies, which form two major domains: G-domain and C-terminal.

KRASµÄG½á¹¹ÓòÓɲлù1-166×é³É £¬°üÀ¨GTPÁ¬Ïµ¿Ú´ü £¬¸ÃÇøÓò¹ØÓÚÏÂÓÎЧӦÎïºÍGTPase¼¤»îÂѰ×Ö®¼äµÄÏ໥֮¼ä×÷ÓÃÖÁ¹ØÖ÷Òª ¡£

The G-domain  of KRAS, comprised of residues 1-166, includes the GTP-binding pocket, a region within which is essential for the interactions between the putative downstream effectors and GTPase-activating proteins.

G½á¹¹ÓòÊǸ߶ÈÊØ¾ÉµÄ £¬°üÀ¨ÈÏÕæGTP-GTP½»Á÷µÄswitch ¢ñºÍswitch ¢òÇøÓò ¡£

The G domain is highly conserved and contains switch ¢ñ and switch ¢ò loops, which are responsible for GDP-GTP exchange.

C¶ËÊÇÒ»¸ö°üÀ¨CAAX»ùÐòµÄ¸ß±äÇø £¬Ö¸µ¼·­ÒëºóÐÞÊβ¢¾öÒéϸ°ûĤ궨 £¬¸ÃÇøÓòÔÚRASÂѰ׵ÄÉúÎï»îÐÔµ÷¿ØÖÐÆð×ÅÖ÷Òª×÷Óà ¡£/p>

The C-terminal, a hypervariable region including the CAAX motif, guides posttranslational modifications and determines plasma membrane anchoring. This region plays an important role in the regulation of the biological activity of RAS protein.

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