Functional dissection of the Drosophila melanogaster condensin subunit Cap-G reveals its exclusive association with condensin I.

Abstract:

:The heteropentameric condensin complexes have been shown to participate in mitotic chromosome condensation and to be required for unperturbed chromatid segregation in nuclear divisions. Vertebrates have two condensin complexes, condensin I and condensin II, which contain the same structural maintenance of chromosomes (SMC) subunits SMC2 and SMC4, but differ in their composition of non-SMC subunits. While a clear biochemical and functional distinction between condensin I and condensin II has been established in vertebrates, the situation in Drosophila melanogaster is less defined. Since Drosophila lacks a clear homolog for the condensin II-specific subunit Cap-G2, the condensin I subunit Cap-G has been hypothesized to be part of both complexes. In vivo microscopy revealed that a functional Cap-G-EGFP variant shows a distinct nuclear enrichment during interphase, which is reminiscent of condensin II localization in vertebrates and contrasts with the cytoplasmic enrichment observed for the other EGFP-fused condensin I subunits. However, we show that this nuclear localization is dispensable for Cap-G chromatin association, for its assembly into the condensin I complex and, importantly, for development into a viable and fertile adult animal. Immunoprecipitation analyses and complex formation studies provide evidence that Cap-G does not associate with condensin II-specific subunits, while it can be readily detected in complexes with condensin I-specific proteins in vitro and in vivo. Mass-spectrometric analyses of proteins associated with the condensin II-specific subunit Cap-H2 not only fail to identify Cap-G but also the other known condensin II-specific homolog Cap-D3. As condensin II-specific subunits are also not found associated with SMC2, our results question the existence of a soluble condensin II complex in Drosophila.

journal_name

PLoS Genet

journal_title

PLoS genetics

authors

Herzog S,Nagarkar Jaiswal S,Urban E,Riemer A,Fischer S,Heidmann SK

doi

10.1371/journal.pgen.1003463

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

e1003463

issue

4

eissn

1553-7390

issn

1553-7404

pii

PGENETICS-D-12-02420

journal_volume

9

pub_type

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