PXD001835

PXD001835 is an original dataset announced via ProteomeXchange.

Title	3D topology of the SMC2/SMC4 sub-complex from chicken condensin I revealed by cross-linking and molecular modelling
Description	SMC proteins are essential components of three protein complexes that are important for chromosome structure and function. The cohesin complex holds replicated sister chromatids together, whereas the condensin complex has an essential role in mitotic chromosome architecture. Both are involved in interphase genome organisation. SMC-containing complexes are large (>650 kDa for condensin) and contain long anti-parallel coiled-coils. They are thus difficult subjects for conventional crystallographic and electron cryomicroscopic studies. Here we have used amino acid-selective cross-linking and mass spectrometry (CLMS) combined with structure prediction to develop a full-length molecular draft 3D-structure of the SMC2/SMC4 dimeric backbone of chicken condensin. We assembled homology-based molecular models of the globular heads and hinges with the lengthy coiled-coils modelled in fragments, using numerous high-confidence cross-links and accounting for potential irregularity. Our experiments reveal that isolated condensin complexes can exist with their coiled-coil segments closely apposed to one another along their lengths and define the relative spatial alignment of the two anti-parallel coils. The centres of the coiled-coils can also approach one another closely in situ in mitotic chromosomes. In addition to revealing structural information, our cross-linking data suggest that both H2A and H4 may have roles in condensin interactions with chromatin.
HostingRepository	PRIDE
AnnounceDate	2024-10-22
AnnouncementXML	Submission_2024-10-22_04:23:34.020.xml
DigitalObjectIdentifier
ReviewLevel	Peer-reviewed dataset
DatasetOrigin	Original dataset
RepositorySupport	Unsupported dataset by repository
PrimarySubmitter	Zhuo Chen
SpeciesList	scientific name: Gallus gallus (Chicken); NCBI TaxID: 9031;
ModificationList	monohydroxylated residue; iodoacetamide derivatized residue
Instrument	LTQ Orbitrap Velos

Revision	Datetime	Status	ChangeLog Entry
0	2015-02-23 01:24:55	ID requested
1	2015-07-13 05:35:34	announced
⏵ 2	2024-10-22 04:23:42	announced	2024-10-22: Updated project metadata.

Barysz H, Kim JH, Chen ZA, Hudson DF, Rappsilber J, Gerloff DL, Earnshaw WC, Three-dimensional topology of the SMC2/SMC4 subcomplex from chicken condensin I revealed by cross-linking and molecular modelling. Open Biol, 5(2):150005(2015) [pubmed]

10.1098/rsob.150005;

curator keyword: Biological

submitter keyword: condensin, cross-linking, mass spectrometry,SMC, structure, coiled-coil

Juri Rappsilber
contact affiliation	Wellcome Trust Centre for Cell Biology, Institute of Cell Biology, University of Edinburgh Department of Bioanalytics, Institute of Biotechnology, Technische Universität Berlin
contact email	juri.rappsilber@ed.ac.uk
lab head
Zhuo Chen
contact affiliation	Technischen Universität Berlin
contact email	zhuo.chen@ed.ac.uk
dataset submitter

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PRIDE project URI

• PRIDE
  1. PXD001835
     1. Label: PRIDE project
     2. Name: 3D topology of the SMC2/SMC4 sub-complex from chicken condensin I revealed by cross-linking and molecular modelling