Distinct but overlapping domains of AKAP95 are implicated in chromosome condensation and condensin targeting.

Abstract:

:A-kinase (or PKA)-anchoring protein AKAP95 is a zinc-finger protein implicated in mitotic chromosome condensation by acting as a targeting molecule for the condensin complex. We have identified determinants of chromatin-binding, condensin-targeting and chromosome-condensation activities of AKAP95. Binding of AKAP95 to chromatin is conferred by residues 387-450 and requires zinc finger ZF1. Residues 525-569 are essential for condensation of AKAP95-free chromatin and condensin recruitment to chromosomes. Mutation of either zinc finger of AKAP95 abolishes condensation. However, ZF1 is dispensable for condensin targeting, whereas the C-terminal ZF2 is required. AKAP95 interacts with Xenopus XCAP-H condensin subunit in vitro and in vivo but not with the human hCAP-D2 subunit. The data illustrate the involvement of overlapping, but distinct, domains of AKAP95 for condensin recruitment and chromosome condensation and argue for a key role of ZF1 in chromosome condensation and ZF2 in condensin targeting. Moreover, condensin recruitment to chromatin is not sufficient to promote condensation.

journal_name

EMBO Rep

journal_title

EMBO reports

authors

Eide T,Carlson C,Taskén KA,Hirano T,Taskén K,Collas P

doi

10.1093/embo-reports/kvf089

keywords:

subject

Has Abstract

pub_date

2002-05-01 00:00:00

pages

426-32

issue

5

eissn

1469-221X

issn

1469-3178

pii

kvf089

journal_volume

3

pub_type

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