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Çѱ¹½Ä¹°ÇÐȸ / v.39, no.1, 1996³â, pp.41-48
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ÇØ³àÄá(Canavalia lineata) ÀÚ¿±¿¡¼ Homoserine DehydrogenaseÀÇ Á¤Á¦ ¹× Ư¼º
( Purification and Properties of Homoseine Dehydrogenases in Canavalia Iineata Cotyledons ) |
ÃÖ¿µ¸í; ¼¿ï´ëÇб³ ÀÚ¿¬°úÇдëÇÐ »ý¹°Çаú;
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¹ß¾Æ ÈÄ 8ÀÏµÈ ÇØ³àÄá ÀÚ¿±¿¡¼ ¼ºÁúÀÌ ¼·Î ´Ù¸¥ µÎ °³ÀÇ homoserine dehydrogenase¸¦ ºÐ¸®ÇÏ¿´´Ù. ÀÚ¿±¿¡¼ ¾òÀº Á¶È¿¼Ò¾×À» ¿Ã³¸®, Ȳ»ê ¾Ï¸ð´½ ħÀü, DEAE-Sephacel ¹× Sephacryl S-300 °Ö Å©·Î¸¶Åä±×·¡ÇÇ¿Í Procion red dye, Cibacron blue dye ¹× Resource Q Ä÷³ Å©·Î¸¶Åä±×·¡ÇÇ·Î Á¤Á¦ÇÏ¿´´Ù. °Ö Å©·Î¸¶Åä±×·¡ÇÇ¿¡¼ ¾òÀº 2°³ÀÇ È°¼ººÐȹ Áß T-Çü(Æ®·¹¿À´Ñ °¨¼ö¼º)°ú K-Çü(Æ®·¹¿À´Ñ ºñ°¨¼ö¼º)ÀÇ ºÐÀÚ·®Àº °¢°¢ 230 kD°ú 135 kDÀ̾ú´Ù. 10mM Æ®·¹¿À´Ñ ÷°¡·Î T-Çü È¿¼Ò´Â 70% ÀÌ»óÀÇ È°¼ºÀúÇØ¸¦ ¹Þ¾ÒÀ¸³ª K-Çü È¿¼Ò´Â ÀüÇô ¾ïÁ¦¸¦ ¹ÞÁö ¾Ê¾Ò´Ù. Homoserine¿¡ ´ëÇÑ KmÀº T-ÇüÀÌ 1.6mM, K-ÇüÀÌ 0.3mMÀ̾ú°í, NAD¿¡ ´ëÇÑ KmÀº T-ÇüÀÌ 2.34mM, K-ÇüÀÌ 0.03mMÀ̾úÀ¸¸ç NADP¿¡ ´ëÇÑ KmÀº µÎ È¿¼Ò¿¡¼ µ¿ÀÏÇÏ°Ô 0.01mM·Î »êÃâµÇ¾ú´Ù. 400mM KCl¿¡¼ T-ÇüÀº 4.9¹è, K-ÇüÀº 2.8¹èÀÇ È°¼ºÁõ°¡¸¦ º¸¿´´Ù. ºÎºÐÁ¤Ã¼(Sephacryl S-300 °Ö Å©·Î¸¶Åä±×·¡ÇÇ)µÈ »óÅÂÀÇ T-Çü°ú K-ÇüÀº Á¶°Ç¿¡ µû¶ó ½±°Ô »óÈ£ÀüȯµÇ¾ú´Ù. |
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Two forms of homo serine dehydrogenase have been isolated from 8-day-old cotyledons of Canavalin lineata by a heat denaturation, ammonium sulfate fractionation, DEAE-8ephacel ion exchange and Sephacryl 8-300 gel filtration chromatographies, and Pro cion red dye, Cibacron blue dye and Resource Q column chromatographies. The molecular weights of T -form (threonine-sensitive) and K-form(threonine- insensitive) were estimated to 230 kD and 135 kD, respectively. In the presence of 10 mM threonine, the activity of T-form was inhibited with almost 70%, but that of K-form was not at all. The Km values tor homo serine of T- and Kform were 1.6 mM and 0.3 mM, respectively. The Km values for NAD of T- and K-form were 2.34 mM and 0.03 mM, respectively. And Km values for NADP of two isozymes were the same as 0.01 mM. The activities of T- and K-form were markedly stimulated up to 4.9and 2.8-fold, respectively, by 400 mM KCI. The partial purified(gel filtration) enzymes(Tform and K-form) can be reversibly converted.verted. |
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ÇØ³àÄá;Procion red dye Ä÷³;Resource QÄ÷³;»óÈ£Àüȯ;Canavalia lineata;homoserine dehydrogenase;Procion red dye column;Resource Q column;interconversion; |
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Journal of Plant Biology / v.39, no.1, 1996³â, pp.41-48
Çѱ¹½Ä¹°ÇÐȸ
ISSN : 1226-9239
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199611920118254)
¾ð¾î : Çѱ¹¾î |
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³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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