>gnl|CDD|146638 pfam04107, GCS2, Glutamate-cysteine ligase family 2(GCS2). Also known as gamma-glutamylcysteine synthetase and gamma-ECS (EC:6.3.2.2). This enzyme catalyses the first and rate limiting step in de novo glutathione biosynthesis. Members of this family are found in archaea, bacteria and plants. May and Leaver discuss the possible evolutionary origins of glutamate-cysteine ligase enzymes in different organisms and suggest that it evolved independently in different eukaryotes, from an ancestral bacterial enzyme. They also state that Arabidopsis thaliana gamma-glutamylcysteine synthetase is structurally unrelated to mammalian, yeast and Escherichia coli homologues. In plants, there are separate cytosolic and chloroplast forms of the enzyme. Length = 291

Score = 223 bits (569), Expect = 1e-58 Identities = 105/307 (34%), Positives = 151/307 (49%), Gaps = 24/307 (7%) Query: 48 RPLPYDGEKSIVTILQAIQKKLAWKEIMDKGNIIGLANPLSKAGISIEPGGQLELSTTTL 107 R L + E +V +L W I++ IGL L + PGGQ+ELST L Sbjct: 1 RTLGVEEEFGVVDLLGGDL--RGWSPILEDEAKIGL--SLGGGFVKELPGGQVELSTPPL 56 Query: 108 QNVHQIKGEILGYIQILKEITQNLDLGILGMGFNPKWKLDEMPIMPKSRYVLMKKYMPQV 167 +++ + EI + + L+ + L LG+LG+G +P P+MPK RY M +YMP+V Sbjct: 57 ESLAEAAEEISQHREELRHVADELGLGLLGLGTHPFALRSRDPVMPKGRYRRMYEYMPRV 116 Query: 168 GTHGLDMMFRTCTTQVSLDFSSEHDMATKLRVSFKLQPLATAIFASSPFAEGRINGFQSW 227 G +G MM C QV++D SSE MA LR+ L P+ A+ A+SPF GR G+ S Sbjct: 117 GVYGRQMMVAGCHVQVNIDSSSEAIMA-VLRLVRALLPVLLALSANSPFWGGRDTGYAST 175 Query: 228 RSEIWRHTDSDRTEILPFILRDNSNFEHYAQWALDIPMYFILRKKEYYCCTDITFRQFMN 287 R+ I+ T + + LP D + FE YA++ALD + F+ R + + Sbjct: 176 RALIF--TQTPQAGPLPLAFEDGA-FERYARYALDTGIIFVRR--------RLWWD---- 220 Query: 288 GALKGRIKEWHPTLEDWENHLSTLFPAVRLRNCLEMRGADSGRLENIFAVAAFWTGILYD 347 GR + H +T FP VRLR LE R D+ + A+ A WT L D Sbjct: 221 ----GRPPGLPGETLELRIHDTTAFPPVRLRALLEARLLDAQPDWRLDALPAAWTVALLD 276 Query: 348 SSALQNA 354 A +NA Sbjct: 277 DEAEENA 283

RPSBLAST alignment for GI: 254781161 and conserved domain: pfam04107