Dataset Information

Assembly, analysis and architecture of atypical ubiquitin chains.

ABSTRACT: Ubiquitin (Ub) chains regulate many cellular processes, but several chain types including Lys6 linkages have remained unstudied. Here we analyze the bacterial effector E3 ligase NleL (non-Lee-encoded effector ligase) from enterohemorrhagic Escherichia coli (EHEC) O157:H7, which assembles Lys6- and Lys48-linked Ub polymers. Using linkage-specific human deubiquitinases (DUBs) we show that NleL generates heterotypic Ub chains, and branched chains are efficiently hydrolyzed by DUBs. USP family DUBs cleave Lys6-linked polymers exclusively from the distal end, whereas a DUB with preference for Lys6 can cleave Lys6-linked polymers at any position in the chain. We used NleL to generate large quantities of Lys6-linked polyUb. Crystallographic and NMR spectroscopy analyses revealed that an asymmetric interface between Ile44 and Ile36 hydrophobic patches of neighboring Ub moieties is propagated in longer Lys6-linked Ub chains. Interactions via the Ile36 patch can displace Leu8 from the Ile44 patch, leading to marked structural perturbations of Ub.

SUBMITTER: Hospenthal MK

PROVIDER: S-EPMC4176834 | biostudies-literature | 2013 May

REPOSITORIES: biostudies-literature

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Assembly, analysis and architecture of atypical ubiquitin chains.

Hospenthal Manuela K MK Freund Stefan M V SM Komander David D

Nature structural & molecular biology 20130407 5

Ubiquitin (Ub) chains regulate many cellular processes, but several chain types including Lys6 linkages have remained unstudied. Here we analyze the bacterial effector E3 ligase NleL (non-Lee-encoded effector ligase) from enterohemorrhagic Escherichia coli (EHEC) O157:H7, which assembles Lys6- and Lys48-linked Ub polymers. Using linkage-specific human deubiquitinases (DUBs) we show that NleL generates heterotypic Ub chains, and branched chains are efficiently hydrolyzed by DUBs. USP family DUBs ...[more]

PMID: 23563141

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Project description:Whereas open-framework materials have been made in a variety of chemical compositions, few are known in which 3-connected SO3(2)- anions serve as basic building units. Here, we report four new metal-sulfite polymeric structures, (ZnSO3)Py (1, py = pyridine), (ZnSO3)2(2,2'-bipy)H2O (2, 2,2'-bipy = 2,2'-bipyridine), (ZnSO3)2(TMDPy) (3, TMDPy = 4,4'-trimethylenedipyridine), and (MnSO3)2en (4, en = ethylenediamine) that have been synthesized hydrothermally and structurally characterized. In these compounds, low-dimensional 1D and 2D inorganic subunits are assembled into higher 2D or 3D covalent frameworks by organic ligands. In addition to the structure-directing effect of organic ligands, the flexible coordination chemistry of Zn2+ and SO3(2)- also contributes to the observed structural diversity. In compounds 1-3, Zn2+ sites alternate with trigonal pyramidal SO3(2)- anions to form three types of [ZnSO3]n chains, whereas in compound 4, a 2D-corrugated [MnSO3]n layer is present. Compound 1 features a rail-like chain with pendant pyridine rings. The pi-pi interaction between 2,2'-bipy ligands is found between adjacent chains in compound 2, resulting in 2D sheets that are further stacked through interlayer hydrogen bonds. Compound 3 exhibits a very interesting inorganic [(ZnSO3)2]n chain constructed from two chairlike subunits, and such chains are bridged by TMDPy ligands into a 2D sheet. In compound 4, side-by-side helical chains permeate through 2D-corrugated [MnSO3]n layers, which are pillared by neutral ethylenediamine molecules into a 3D framework that can be topologically represented as a (3,6)-connected net. The results presented here illustrate the rich structural chemistry of metal-sulfites and the potential of sulfite anions as a unique structural building block for the construction of novel open-framework materials, in particular, those containing polymeric inorganic subunits that may have interesting physical properties such as low-dimensional magnetism or electronic properties.

Dataset Information

Assembly, analysis and architecture of atypical ubiquitin chains.

Publications

Assembly, analysis and architecture of atypical ubiquitin chains.

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