Structural properties of PAS domains from the KCNH potassium channels.
Structural properties of PAS domains from the KCNH potassium channels.
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DOI:
10.1371/journal.pone.0059265
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Morais-Cabral JH
中科院分区:
文献类型:
--
作者:
Adaixo R;Harley CA;Castro-Rodrigues AF;Morais-Cabral JH
KCNH channels form an important family of voltage gated potassium channels. These channels include a N-terminal Per-Arnt-Sim (PAS) domain with unknown function. In other proteins PAS domains are implicated in cellular responses to environmental queues through small molecule binding or involvement in signaling cascades. To better understand their role we characterized the structural properties of several channel PAS domains. We determined high resolution structures of PAS domains from the mouse EAG (mEAG), drosophila ELK (dELK) and human ERG (hERG) channels and also of the hERG domain without the first nine amino acids. We analyzed these structures for features connected to ligand binding and signaling in other PAS domains. In particular, we have found cavities in the hERG and mEAG structures that share similarities with the ligand binding sites from other PAS domains. These cavities are lined by polar and apolar chemical groups and display potential flexibility in their volume. We have also found that the hydrophobic patch on the domain β-sheet is a conserved feature and appears to drive the formation of protein-protein contacts. In addition, the structures of the dELK domain and of the truncated hERG domain revealed the presence of N-terminal helices. These helices are equivalent to the helix described in the hERG NMR structures and are known to be important for channel function. Overall, these channel domains retain many of the PAS domain characteristics known to be important for cell signaling.
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发表时间:
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影响因子:
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DOI:
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发表时间:
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期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
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