FEATURES

FAMILY

DESCRIPTION

Also known as BUB1B_HUMAN, BUB1B, BUBR1, MAD3L, SSK1. Essential component of the mitotic checkpoint. Required for normal mitosis progression. The mitotic checkpoint delays anaphase until all chromosomes are properly attached to the mitotic spindle. One of its checkpoint functions is to inhibit the activity of the anaphase-promoting complex/cyclosome (APC/C) by blocking the binding of CDC20 to APC/C, independently of its kinase activity. The other is to monitor kinetochore activities that depend on the kinetochore motor CENPE. Required for kinetochore localization of CENPE. Negatively regulates PLK1 activity in interphase cells and suppresses centrosome amplification. Also implicated in triggering apoptosis in polyploid cells that exit aberrantly from mitotic arrest. May play a role for tumor suppression. Interacts with CENPE (PubMed:12925705, PubMed:19625775). Interacts with PLK1 (PubMed:16760428, PubMed:17785528, PubMed:17376779, PubMed:19503101). Part of a complex containing BUB3, CDC20 and BUB1B (PubMed:11702782). Interacts with anaphase-promoting complex/cyclosome (APC/C) (PubMed:10477750). Interacts with KNL1 (PubMed:17981135). Interacts with KAT2B (PubMed:19407811). Interacts with RIPK3 (PubMed:29883609). Interacts with the closed conformation form of MAD2L1 (PubMed:29162720).

EXTERNAL LINKS

BUB1B

Mitotic checkpoint serine/threonine-protein kinase BUB1 beta

BUB1B

Molecular Synopsis