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. 2012 Dec 7;13(Suppl 17):S2. doi: 10.1186/1471-2105-13-S17-S2

Table 2.

Active site residues.

EcIDH BsIDH ApIDH BpIDH MtIDH1 HcIDH YmIDH PmIDH TmIDH TtIDH AvIDH CgIDH
Subfamily I I I I II II II II II IV M M

Phos loop start T105 T96 T112 T107 T78 T78 T77 T78 T77 T90 S86 S85
Phos loop end S113 S104 S120 S115 S95 S95 S94 S95 S94 S98 S132 S130
Isocitrate
Binding
N115 N106 N122 N117 N97 N97 N96 N97 N96 N100 N135 N133
Isocitrate
Binding
R119 R110 R126 R121 R101 R101 R100 R101 R100 R104 R139 R137
Isocitrate
Binding
R129 R119 R136 R131 R110 R110 R109 R110 R109 R114 R145 R143
Isocitrate
Binding
R153 R143 R159 R155 R133 R133 R132 R133 R132 R138 R547 R543
Isocitrate
Binding
Y160 Y150 Y166 Y162 Y140 Y140 Y138 Y140 Y139 Y143 Y420 Y416
Active site. K230' K220' K233' K232' K213' K213' K212' K212' K208' K191' K255 K253
Active site. D283' D286' D287' D285' D252' D252' D252' D252' D247' D224' D350 D348
Metal binding D307' D310' D311' D309' D276' D276' D275' D275' D270' D248' D548 D544
N-loop start. G340 G345 G344 G342 G311 G311 G310 G310 G304 G281 G583 G579
NADP binding K344 K349 K348 K346 R315 R315 R314 R314 R308 K285 K588 K584
NADP binding Y345 Y350 Y349 Y347 H316 H316 H315 H315 H309 Y286 H589 H585
N-loop end G347 G352 G351 G349 G323 G323 G322 G322 G316 G288 G597 N593
N-loop extension N352 N357 N356 N354 N329 N329 N328 N328 N322 N293 D602 D598

Active site residues in Isocitrate Dehydrogenases. The residues in S1, S2 and S4 align properly in structural alignment. Functionally monomeric IDHs (type M) are also included for comparison. In monomeric IDHs, the respective residues don't appear in the same sequence. They do not have a Phos loop. Serine residues (such as S86 in AvIDH) play a similar role to threonines in dimeric IDHs and are indicated in italic font. N-loop refers to the NADP binding loop.