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Çѱ¹»ý¸í°øÇבּ¸¿ø À̽±¸ ¹Ú»ç, ±èÇϼº ¹Ú»ç
Controlled Localization of Functionally Active Proteins to Inclusion Bodies Using Leucine Zippers, PLOS ONE. June 04 2014, DOI: 10.1371/journal.pone.0097093.
1. ¿¬±¸¹è°æ
Inclusion bodies (IBs)´Â ¼¼Æ÷Áú¿¡ ¼Ò¼ö¼º ´Ü¹éÁúÀ» °í¹ßÇöÇÒ ¶§ ÈçÈ÷ ¹ß°ßµÇ´Â ¾à 0.5~1.3 m Å©±âÀÇ ¼¼Æ÷³» ±¸Á¶Ã¼ÀÌ´Ù [1]. IBs´Â ÀϹÝÀûÀ¸·Î ¼¼Æ÷³»¿¡¼ ´Ü¹éÁú °íÀ¯ÀÇ È°¼ºÀ» ³ªÅ¸³»Áö ¾Ê´Â °ÍÀ¸·Î ¾Ë·ÁÁ® ÀÖÁö¸¸ ÃÖ±Ù ÀÌ·¯ÇÑ IBsµéÀÌ 30~40% Á¤µµÀÇ ´Ü¹éÁú È°¼ºÀ» À¯ÁöÇÑ Ã¤·Î ´ëÀå±Õ ³»¿¡¼ °üÂûµÈ´Ù´Â ¿¬±¸°¡ º¸°íµÇ¾ú´Ù [2, 3]. º» ¿¬±¸´Â ÀÌ·¯ÇÑ È°¼ºÇü IBs¸¦ È°¿ëÇÏ¿© ¼¼Æ÷ ³» È¿¼Ò°íÁ¤È ¹× ºü¸¥ ¿¬¼Ó¹ÝÀÀÀ» À¯µµÇÏ·Á´Â ¿¬±¸ÀÌ´Ù. À̸¦ À§ÇÏ¿© leucine zipper(LZs)´Ü¹éÁúÀ» ģȼº ű×(affinity tag)·Î ÀÌ¿ëÇÏ¿© ¸ñÇ¥ ´Ü¹éÁúÀÌ IBs¿¡ À§Ä¡(localization)ÇÏ´Â Á¤µµ¸¦ ½ÇÁ¦ ¹Ì»ý¹° ¼¼Æ÷Áú Á¶°Ç¿¡¼ Á¶»çÇÏ¿´´Ù.
±×¸² 1. (A) »óº¸ÀûÀÎ µÎ °¡´ÚÀÇ LZ¿¡ ÀÇÇÑ »óÈ£ÀÛ¿ë, Á¡¼±Àº glutamic acid¿Í lysinÀÇ ±Ø¼º°áÇÕÀ» ³ªÅ¸³¿. (B) LZ¸¦ ÀÌ¿ëÇؼ ¼¼Æ÷ ³» RFP¸¦ IBs·Î ±¹¼ÒÈÇÑ °á°ú. (C) EGFP¸¸ ´Üµ¶ ¹ßÇö½ÃŲ °æ¿ì(»ó´Ü)¿Í EGFP-CBDÀ» ´ëÀå±Õ¿¡¼ ¹ßÇö½ÃŲ ÈÄ È°¼ºÇü ÀÀÁýü¸¦ Çü¼º(ÇÏ´Ü)ÇÑ À̹ÌÁö
¿¬±¸¿¡¼ »ç¿ëµÈ LZs´Â ´Ù¾çÇÑ DNA °áÇÕ ´Ü¹éÁúÀ̳ª dimerization µµ¸ÞÀο¡¼ ã¾Æº¼ ¼ö ÀÖ´Â heterodimer·Î¼ ÇÑ °¡´ÚÀÇ LZ¿¡´Â ¿©·¯ °³ÀÇ leucine ÀܱⰡ 7°³ °£°ÝÀ¸·Î À§Ä¡ÇÏ°í ÀÌ´Â ¼Ò¼ö¼º alpha helix¸¦ Çü¼ºÇÏ¿© ÀÌ·®Ã¼¸¦ ¸¸µé¾î³½´Ù. ÀÌ·¯ÇÑ °áÇÕ Æ¯¼ºÀ» ÀÌ¿ëÇϸé IBs¿¡ ¼ö¿ë¼º ¼¼Æ÷Áú ´Ü¹éÁúÀ» °íÁ¤½ÃÅ°°í ¼¼Æ÷ ³»¿¡¼ ÇØ´ç ´Ü¹éÁúÀ» ±¹¼ÒÈ ½ÃÅ°´Â È¿°ú¸¦ ¾òÀ» ¼ö ÀÖ´Ù(±×¸²1A, 1B). º» ¿¬±¸¿¡¼´Â ¼ö¿ë¼º ¼¼Æ÷Áú ´Ü¹éÁúÀÇ ¿¹·Î red fluorescent protein 1(mRFP1)À» »ç¿ë ÇßÀ¸¸ç Çö¹Ì°æ°ú flow cytometric ºÐ¼®À» ÅëÇÏ¿© ±¹¼ÒÈµÈ mRFP1À» °üÂûÇÏ°í LZsÀÇ °áÇÕ °µµ¿¡ µû¶ó¼ ±¹¼ÒÈ Á¤µµ°¡ Á¶ÀýÇÏ°íÀÚ ÇÏ¿´´Ù.
2. ¿¬±¸°á°ú
¼¼Æ÷ ³»¿¡¼ È°¼ºÇü IBsÀÇ Çü¼ºÀ» È®ÀÎÇϱâ À§Çؼ C. fimi À¯·¡ÀÇ family II CBDÀÇ C¸»´Ü¿¡ EGFP¸¦ °áÇÕÇÏ¿© ´ëÀå±Õ¿¡¼ ¹ßÇö ÈÄ À̹ÌÁö·Î °üÂûÇÑ °á°ú ¼¼Æ÷ Çϳª´ç Çϳª ¶Ç´Â µÎ °³ÀÇ IBs¸¦ Çü¼ºÇÔÀ» º¸¿´´Ù [±×¸²1C]. º» ¿¬±¸ÆÀÀº À§ CBDµµ¸ÞÀÎÀÌ ´Ù¾çÇÑ È¿¼Ò¸¦ È°¼ºÇü ´Ü¹éÁú ÀÔÀÚ·Î Àüȯ½ÃÅ°´Â È¿°ú°¡ ÀÖ´Â °ÍÀ» ÀÌ¹Ì º¸°íÇÑ ¹Ù ÀÖ´Ù
LZs¸¦ ÀÌ¿ëÇÏ¿© IBs¿¡ ¼ö¿ë¼º ¼¼Æ÷Áú ´Ü¹éÁúÀ» °íÁ¤ÇÏ´Â È¿°ú¸¦ È®ÀÎÇϱâ À§ÇÏ¿© mRFP1¿¡ prey LZ¸¦ ¿¬°áÇÏ°í (prey-mRFP1) EGFP¿Í CBD¸¦ °áÇÕÇÑ EGFP-CBD ´Ü¹éÁú¿¡ bait LZ¸¦ ¿¬°áÇÏ¿© (bait-EGFP-CBD) pET21a ¹éÅÍ¿¡ ±¸Çö ÈÄ ´ëÀå±Õ¿¡¼ ¹ßÇö½ÃÄ×´Ù. ±× °á°ú bait-EGFP-CBD¿Í prey-mRFP1¸¦ °°ÀÌ ¹ßÇö½ÃŲ ¼¼Æ÷¿¡¼´Â ±¹¼ÒÈµÈ RedÇü±¤ÀÌ °üÂû µÇ¾úÁö¸¸ bait LZ°¡ ¾øÀÌ ¹ßÇö½ÃŲ ¼¼Æ÷¿¡¼´Â Çü±¤ÀÌ ¼¼Æ÷ Àüü¿¡ ÆÛÁ®¼ °üÂûµÇ¾ú´Ù [±×¸² 3].
±×¸²2. bait-EGFP-CBD¿Í prey-mRFP1¸¦ °°ÀÌ ¹ßÇö½Ãų °æ¿ì mRFP°¡ IBs·Î ±¹¼ÒÈ µÇ´Â ¹Ý¸é (»ó´Ü), »óÈ£ÀÛ¿ëÀÌ ¾ø´Â °æ¿ì mRFP°¡ ¼¼Æ÷ ³»¿¡ ³Ð°Ô ÆÛÁ®ÀÖÀ½
ÀÌ¾î¼ LZÀÇ Ä£Èµµ¿¡ µû¸¥ ±¹¼Òȸ¦ °üÂûÇϱâ À§ÇÏ¿© ´Ù¾çÇÑ KD °ªÀ» °¡Áø LZ¸¦ ÁغñÇÏ°í [4] (8, 20, 31, 50, 1000¥ìM), prey-mRFP1ÀÇ ±¹¼Òȸ¦ Çü±¤ Çö¹Ì°æÀ» ÀÌ¿ëÇÏ¿© °üÂûÇÏ¿´´Ù. ±× °á°ú KD°ªÀÌ 8¥ìMÀÎ °æ¿ì ±¹¼ÒÈ µÇ´Â Á¤µµ°¡ °øÀ¯°áÇÕ¿¡ ÀÇÇÏ¿© ¿¬°áµÇ´Â EGFP-CBD¸¦ ¹ßÇö½ÃŲ °á°ú¿Í ºñ½ÁÇÑ ¼öÁØÀ¸·Î °üÂûµÇ¾ú´Ù. ÀÌ´Â KD=8¥ìM ÀÌ ¼¼Æ÷ ³»¿¡¼ ÃæºÐÇÑ °áÇÕ·ÂÀ» Á¦°øÇϸç À̺¸´Ù ³·Àº KD¿¡¼´Â ¼¼Æ÷ ³»¿¡¼ ±¹¼ÒÈ°¡ °¨¼ÒÇÏ´Â °ÍÀ» ¾Ë ¼ö ÀÖ¾ú´Ù [±×¸²4]. ÀÌ °á°ú´Â ´Ù¾çÇÑ ¼¼Æ÷ ³» È¿¼ÒµéÀ» ÇÊ¿ä¿¡ µû¶ó ´Ü¹éÁúÀÔÀÚ·Î À̵¿½Ãų ¼ö ÀÖÀ¸¸ç °áÇÕÁ¤µµ ¿ªÀÌ LZ¸¦ ÀÌ¿ëÇÏ¿© ÄÁÆ®·Ñ ÇÒ ¼ö ÀÖÀ½À» º¸¿©ÁÖ´Â °á°úÀÌ´Ù.
±×¸² 3. LZsÀÇ °áÇÕ Á¤µµ¿¡ µû¸¥ ´Ü¹éÁú (RFP)ÀÇ ±¹¼ÒÈ Á¤µµ¸¦ ³ªÅ¸³»´Â Çö¹Ì°æ À̹ÌÁö
ÇÑÆí º» ¿¬±¸¿¡¼´Â Çü±¤À¯¼¼Æ÷ºÐ¼®±â(FACS)¸¦ ´Ü¹éÁúÀÔÀÚ Çü¼º ¹× »óÈ£ÀÛ¿ë °üÂû¿¡ ÀÌ¿ëÇÏ´Â ¹æ¹ýÀ» ±¸ÃàÇÏ¿´´Ù(±×¸²4). ±× °á°ú LZ»çÀÌÀÇ Ä£Èµµ¿¡ µû¶ó¼ ±¹¼ÒÈ Á¤µµ°¡ ´Þ¶óÁö´Â °ÍÀ» FACS¸¦ ÀÌ¿ëÇÏ¿© °í¼Ó ºÐ¼®ÇÒ ¼ö ÀÖ¾úÀ¸¸ç, ÀÌ´Â »ì¾ÆÀÖ´Â ¼¼Æ÷ ³»¿¡¼ »óÈ£ÀÛ¿ëÀ» Á÷Á¢ÀûÀ¸·Î ºÐ¼®ÇÏ´Â µ¥ À¯¿ëÇÒ »Ó¸¸ ¾Æ´Ï¶ó, ¶óÀ̺귯¸® °í¼Ó °Ë»öÀ» ÅëÇÏ¿© »óÈ£ÀÛ¿ë ģȵµ¸¦ °³·®ÇÏ´Â ´Ü¹éÁú°øÇÐ ¿¬±¸¿¡µµ À¯¿ëÇÑ ±â¼úÀÓÀ» º¸¿©ÁÖ´Â °ÍÀÌ´Ù.
±×¸² 4. FACS¸¦ ÀÌ¿ëÇÏ¿© LZsÀÇ °áÇÕÁ¤µµ¿¡ µû¶ó ´Ü¹éÁúÀÇ IBsÀ̵¿À» °üÂûÇÑ °á°ú
3. ¿¬±¸ÀÇ ¼º°ú ¹× ÀÇÀÇ
ÇÕ¼º»ý¹°ÇÐÀÇ ´ëÇ¥Àû ÀÀ¿ëºÐ¾ßÀÇ Çϳª´Â Àΰø ´Ü¹éÁú±¸Á¶Ã¼¸¦ ÀÌ¿ëÇÑ °íÈ¿À² ÇÕ¼ºÀÌ´Ù [5, 6]. º» ¿¬±¸´Â ´Ù¾çÇÑ °áÇÕ·ÂÀ» °®´Â LZs¸¦ ÀÌ¿ëÇÏ¿© ¼¼Æ÷Áú ³» ´Ù¾çÇÑ ´ë»çü ÇÕ¼ºÈ¿¼Ò¸¦ °íÁ¤È ÇÏ¿© °ü·ÃµÈ ¼øÂ÷Àû ´ë»ç¹ÝÀÀÀ» ÃËÁøÇÏ´Â Àΰø ±¸Á¶Ã¼¸¦ °³¹ßÇϴµ¥ »ç¿ëµÉ ¼ö ÀÖÀ» °ÍÀÌ´Ù. ¶ÇÇÑ º» ±â¼úÀº ´Ü¹éÁú °£ »óÈ£ÀÛ¿ëÀ» °í°¨µµ·Î °¨ÁöÇÒ ¼ö ÀÖ¾î¼ flow cytometry¿Í ¿¬°èÇÑ high throughput ´Ü¹éÁú »óÈ£ÀÛ¿ë °ËÃâ Ç÷¿ÆûÀ¸·Î »ç¿ëµÉ ¼ö ÀÖ´Ù.
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1. Palmer I, Wingfield PT (2012) Preparation and extraction of insoluble (inclusion-body) proteins from Escherichia coli. Curr Protoc Protein Sci Chapter 6: Unit6 3.
2. Ventura S, Villaverde A (2006) Protein quality in bacterial inclusion bodies. Trends Biotechnol 24: 179-185.
3. Garcia-Fruitos E, Gonzalez-Montalban N, Morell M, Vera A, Ferraz RM, et al. (2005) Aggregation as bacterial inclusion bodies does not imply inactivation of enzymes and fluorescent proteins. Microb Cell Fact 4: 27.
4. Magliery TJ, Wilson CG, Pan W, Mishler D, Ghosh I, et al. (2005) Detecting protein-protein interactions with a green fluorescent protein fragment reassembly trap: scope and mechanism. J Am Chem Soc 127: 146-157.
5. Dueber JE, Wu GC, Malmirchegini GR, Moon TS, Petzold CJ, et al. (2009) Synthetic protein scaffolds provide modular control over metabolic flux. Nat Biotechnol 27: 753-759.
6. You C, Zhang YH (2013) Self-assembly of synthetic metabolons through synthetic protein scaffolds: one-step purification, co-immobilization, and substrate channeling. ACS Synth Biol 2: 102-110.