S. pombe Pbh1p: an inhibitor of apoptosis domain containing protein is essential for chromosome segregation

FEBS Letters

Balasubramanian, Mohan K¹  Rajagopalan, Srividya¹ 

[1] Institute of Molecular Agrobiology, The National University of Singapore, 1 Research Link, Singapore 117604, Singapore

关键词: BIR domain;    Apoptosis;    pbh1;    Mitosis;    Fission yeast;   

DOI  :  10.1016/S0014-5793(99)01329-0

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Proteins containing the baculovirus inhibitor of apoptosis repeats (BIR domains) have been identified in a wide range of species. BIR domain containing proteins are thought to inhibit caspases and thereby cause inhibition of apoptosis. A BIR domain containing protein has been recently identified by the Schizosaccharomyces pombe genome sequencing project. However, caspase-like proteins have not been found in yeasts, suggesting that the BIR domain containing proteins might play a fundamental role in cell regulation, in addition to their well-characterized role in inhibition of apoptosis. In this study, we have characterized Pbh1p, an S. pombe BIR domain containing protein. Construction and analysis of a null mutant in pbh1 ⁺ revealed that pbh1 ⁺ is essential for cell viability. Moreover, cells devoid of Pbh1p are defective in chromosome condensation and chromosome segregation. Thus, proper chromosome segregation requires the function of Pbh1p. Over-production of Pbh1p led to abnormalities in mitosis and cytokinesis, suggesting that the levels of Pbh1p are important for regulation of mitosis and cytokinesis.

【 授权许可】

Unknown