SnapShot: nucleic acid helicases and translocases.

SnapShot: nucleic acid helicases and translocases.
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DOI:
10.1016/j.cell.2008.08.027
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发表时间:
2008-09-05
期刊:
影响因子:
64.5
通讯作者:
Berger JM
Berger JM
中科院分区:
生物学1区
文献类型:
--
作者:
Berger JM

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McrB AAA+(H2-插入进化枝)七聚体 dsDNA IV 型限制酶 细菌 McrB 图例:解旋酶和转位酶的拓扑图 RecA 和 AAA+ 折叠由祖先 αβα ASCE 结构域(绿松石色)构建。显示了结合核苷酸的相对位置,并突出显示了某些核苷-三磷酸结合基序(传感器 I;传感器 II;精氨酸指;Walker-A 和 Walker-B 基序)。 Walker-B 基序的催化谷氨酸可以在某些亚家族(淡红色球体)中占据替代位置。 AAA+ 传感器-I 氨基酸通常是极性残基,也存在于其他 ASCE 蛋白中。三角形代表特定于选择解旋酶和转位酶组的结构域或二级结构元件的常见插入点(例如,SF-I解旋酶的结构域IB和IIB,或AAA+蛋白的前传感器I β发夹)。精氨酸指元件的不同布局源于不同亚家族中结构域或亚基的不同三级和四级排列。
McrB AAA+(H2-insert clade) Heptamer dsDNA Type IV restriction enzymes Bacterial McrB figure legend: topology diagrams of Helicases and translocases The RecA and AAA+ folds are built from an ancestral αβα ASCE domain (turquoise). The relative position of bound nucleotide is shown, and certain nucleoside-triphosphate binding motifs are highlighted (sensor I; sensor II; arginine-finger; Walker-A and Walker-B motifs). The catalytic glutamic acid of the Walker-B motif can occupy alternative positions in some subfamilies (pale red spheres). The AAA+ sensor-I amino acid is generally a polar residue that is also found in other ASCE proteins. Triangles represent common insertion points for domains or secondary structural elements that are specific to select helicase and translocase groups (eg, domains IB and IIB of SF-I helicases, or the pre-sensor I β hairpin of AAA+ proteins). The diverse placement of arginine finger elements arises from distinct tertiary and quaternary arrangements of domains or subunits in different subfamilies.
DNA通过超家族1和超家族2解旋酶放松和蛋白质位移。
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发表时间: 2006
影响因子: 14.9
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发表时间: 2006-09-01
影响因子: 14.9
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