N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells.

N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Research Abstract Details 

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N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Abstract Text:

Alfredo De Biasio,Julie A Vrana,Ping Zhou,Liping Qian,Christine K Bieszczad,Karen E Braley,Aaron M Domina,Steven J Weintraub,John M Neveu,William S Lane,Ruth W Craig,

The antiapoptotic BCL2 family member MCL1 is normally up- and down-modulated in response to environmental signals and conditions, but is constitutively expressed in cancer where it promotes cell survival and drug resistance. A post-translational modification identified here, truncation at the N terminus, was found to act along with previously described ERK- and GSK3-induced phosphorylation events to regulate the turnover of the MCL1 protein and thus its availability for antiapoptotic effects. Although both N-terminally truncated and full-length MCL1 contain sequences enriched in proline, glutamic acid, serine, and threonine and were susceptible to proteasomal degradation, the truncated form decayed less rapidly and was maintained for an extended period in the presence of ERK activation. This was associated with extended cell survival because the truncated form of MCL1 (unlike those of BCL2 and BCLX) retained antiapoptotic activity. N-terminal truncation slightly increased the electrophoretic mobility of MCL1 and differed from the phosphorylation/band shift to decreased mobility, which occurs in the G2/M phase and was not found to affect MCL1 turnover. The N-terminally truncated form of MCL1 was expressed to varying extents in normal lymphoid tissues and was the predominant form present in lymphomas from transgenic mice and human tumor lines of B-lymphoid origin. The degradation versus stabilized expression of antiapoptotic MCL1 is thus controlled by N-terminal truncation as well as by ERK- and GSK3 (but not G2/M)-induced phosphorylation. These modifications may contribute to dysregulated MCL1 expression in cancer and represent targets for promoting its degradation to enhance tumor cell death.

N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Publishing Authors By Initials

A De Biasio,JA Vrana,P Zhou,L Qian,CK Bieszczad,KE Braley,AM Domina,SJ Weintraub,JM Neveu,WS Lane,RW Craig,

For similar peptides: intracellular signaling peptides and proteins: apoptosis regulatory proteins: proto-oncogene proteins c-bcl-2 research abstracts see: peptides: intracellular signaling peptides and proteins: apoptosis regulatory proteins: proto-oncogene proteins c-bcl-2 research

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N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The Journal of biological chemistry

VOLUME: 282

Page Numbers: 23919-36

Journal Abbreviation: J. Biol. Chem.

ISSN: 0021-9258

DAY: 8

MONTH: 06

YEAR: 2007

N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 2985121

N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Keywords Mesh Terms:

KEYWORDS: Proto-Oncogene Proteins c-bcl-2

MESH TERMS: genetics

Chemical & Substance for Abstract: N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells. Information

Substance Name: Proto-Oncogene Proteins c-bcl-2

Registry Number: 0

Grant and Affiliation Information for N-terminal truncation of antiapoptotic MCL1, but not G2/M-induced phosphorylation, is associated with stabilization and abundant expression in tumor cells.

AFFILIATION: Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.

Country: United States

AGENCY: United States NCI

GRANT: CA57359

ACRONYM: CA

MEDLINETA: J Biol Chem

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