Conserved, unstructured regions in Pseudomonas aeruginosa PilO are important for type IVa pilus function.
Conserved, unstructured regions in Pseudomonas aeruginosa PilO are important for type IVa pilus function.
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DOI:
10.1038/s41598-018-20925-w
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发表时间:
2018-02-08
影响因子:
4.6
通讯作者:
Burrows LL
中科院分区:
文献类型:
--
作者:
Leighton TL;Mok MC;Junop MS;Howell PL;Burrows LL
Pseudomonas aeruginosa uses long, thin fibres called type IV pili (T4P) for adherence to surfaces, biofilm formation, and twitching motility. A conserved subcomplex of PilMNOP is required for extension and retraction of T4P. To better understand its function, we attempted to co-crystallize the soluble periplasmic portions of PilNOP, using reductive surface methylation to promote crystal formation. Only PilOΔ109 crystallized; its structure was determined to 1.7 Å resolution using molecular replacement. This new structure revealed two novel features: a shorter N-terminal α1-helix followed by a longer unstructured loop, and a discontinuous β-strand in the second αββ motif, mirroring that in the first motif. PISA analysis identified a potential dimer interface with striking similarity to that of the PilO homolog EpsM from the Vibrio cholerae type II secretion system. We identified highly conserved residues within predicted unstructured regions in PilO proteins from various Pseudomonads and performed site-directed mutagenesis to assess their role in T4P function. R169D and I170A substitutions decreased surface piliation and twitching motility without disrupting PilO homodimer formation. These residues could form important protein-protein interactions with PilN or PilP. This work furthers our understanding of residues critical for T4aP function.
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DOI:
10.1126/science.aad2001
发表时间:
2016-03-11
期刊:
Science (New York, N.Y.)
影响因子:
--
作者:
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通讯作者:
Jensen GJ
影响因子:
5.6
作者:
Ayers, M.;Sampaleanu, L. M.;Burrows, L. L.
通讯作者:
Burrows, L. L.
影响因子:
2.8
作者:
BRADLEY, DE
通讯作者:
BRADLEY, DE
影响因子:
5.7
作者:
Koo, Jason;Lamers, Ryan P.;Howell, P. Lynne
通讯作者:
Howell, P. Lynne
DOI:
10.1107/s0907444909052925
发表时间:
2010-02
期刊:
Acta crystallographica. Section D, Biological crystallography
影响因子:
--
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
通讯作者:
Zwart PH