Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
J Cell Biol. 1998 Mar 9;140(5):991-1002.

A dominant mutant of inner centromere protein (INCENP), a chromosomal protein, disrupts prometaphase congression and cytokinesis.

Author information

  • 1Department of Cell Biology and Anatomy, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, USA.


INCENP is a tightly bound chromosomal protein that transfers to the spindle midzone at the metaphase/anaphase transition. Here, we show that an INCENP truncation mutant (INCENP382-839) associates with microtubules but does not bind to chromosomes, and coats the entire spindle throughout mitosis. Furthermore, an INCENP truncation mutant (INCENP43-839) previously shown not to transfer to the spindle at anaphase (Mackay, A.M., D.M. Eckley, C. Chue, and W.C. Earnshaw. 1993. J. Cell Biol. 123:373-385), is shown here to bind chromosomes, but is unable to target to the centromere. Thus, association with the chromosomes, and specifically with centromeres, appears to be essential for INCENP targeting to the correct spindle subdomain at anaphase. An INCENP truncation mutant (INCENP1-405) that targets to centromeres but lacks the microtubule association region acquires strong dominant-negative characteristics. INCENP1-405 interferes with both prometaphase chromosome alignment and the completion of cytokinesis. INCENP1-405 apparently exerts its effect by displacing the endogenous protein from centromeres. These experiments provide evidence of an unexpected link between this chromosomal protein and cytokinesis, and suggest that one function of INCENP may be to integrate the chromosomal and cytoskeletal events of mitosis.

[PubMed - indexed for MEDLINE]
Free PMC Article

Images from this publication.See all images (9)Free text

Figure 6
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 7
Figure 8
Figure 9
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk