Structural biology of the purine biosynthetic pathway.

Structural biology of the purine biosynthetic pathway.
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DOI:
10.1007/s00018-008-8295-8
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发表时间:
2008-11
影响因子:
8
通讯作者:
Ealick, S. E.
Ealick, S. E.
中科院分区:
生物学1区
文献类型:
--
作者:
Zhang, Y.;Morar, M.;Ealick, S. E.

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嘌呤生物合成需要十个酶促转化以产生肌苷一磷酸。PurF、PurD、PurL、PurM、PurC和PurB是所有途径共有的,而PurN或PurT、PurK/PurE-I或PurE-II、PurH或PurP以及PurJ或PurO在不同生物体中催化相同的步骤。所有15种嘌呤生物合成酶的X射线晶体结构都是可用的,包括7种ATP依赖性酶,2种酰胺转移酶和2种四氢叶酸依赖性酶。在这里,我们总结了嘌呤生物合成酶的结构,讨论了相似性和差异,并提出了途径进化的论点。其中四种ATP依赖酶属于ATP-抓握超家族,两种属于PurM超家族。酰胺基转移酶是不相关的,其中一种利用NTN-转氨酶,另一种利用三联体转氨酶。同样,四氢叶酸依赖酶也是不相关的。祖先蛋白质可能包括广泛的特异性酶而不是PurD、PurT、PurK、PurC和PurP,以及单独的酶而不是PurM和PurL。
Purine biosynthesis requires ten enzymatic transformations to generate inosine monophosphate. PurF, PurD, PurL, PurM, PurC, and PurB are common to all pathways, while PurN or PurT, PurK/PurE-I or PurE-II, PurH or PurP, and PurJ or PurO catalyze the same steps in different organisms. X-ray crystal structures are available for all 15 purine biosynthetic enzymes, including seven ATP-dependent enzymes, two amidotransferases and two tetrahydrofolate-dependent enzymes. Here we summarize the structures of the purine biosynthetic enzymes, discuss similarities and differences, and present arguments for pathway evolution. Four of the ATP-dependent enzymes belong to the ATP-grasp superfamily and two to the PurM superfamily. The amidotransferases are unrelated with one utilizing an NTN-glutaminase and the other utilizing a triad glutaminase. Likewise the tetrahydrofolate-dependent enzymes are unrelated. Ancestral proteins may have included a broad specificity enzyme instead of PurD, PurT, PurK, PurC, and PurP, and a separate enzyme instead of PurM and PurL.
DOI: 10.1074/jbc.m313934200
发表时间: 2004-04-02
影响因子: 4.8
作者:
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