Crystal structure of the N-terminal domain of the secretin GspD from ETEC determined with the assistance of a nanobody.
Crystal structure of the N-terminal domain of the secretin GspD from ETEC determined with the assistance of a nanobody.
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DOI:
10.1016/j.str.2008.11.011
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发表时间:
2009-02-13
期刊:
影响因子:
--
通讯作者:
Hol WG
中科院分区:
文献类型:
--
作者:
Korotkov KV;Pardon E;Steyaert J;Hol WG
Secretins are among the largest bacterial outer membrane proteins known. Here we report the crystal structure of the periplasmic N-terminal domain of GspD (peri-GspD) from the type 2 secretion system (T2SS) secretin in complex with a “nanobody”, the VHH domain of a “heavy-chain” camelid antibody. Two different crystal forms contained the same compact peri-GspD:nanobody heterotetramer. The nanobody contacts peri-GspD mainly via CDR3 and framework residues. The peri-GspD structure reveals three subdomains with the second and third subdomains exhibiting the KH-fold which also occurs in ring-forming proteins of the type 3 secretion system. The first subdomain of GspD is related to domains in phage tail proteins and outer membrane TonB-dependent receptors. A dodecameric peri-GspD model is proposed in which a solvent-accessible β-strand of the first subdomain interacts with secreted proteins and/or T2SS partner proteins by β-strand complementation.
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DOI:
10.1107/s0907444904019158
发表时间:
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影响因子:
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作者:
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通讯作者:
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