Isoforms of JSAP1 scaffold protein generated through alternative splicing

Michihiko Ito, Mizuho Akechi, Ryo Hirose, Michio Ichimura, Nobuhiko Takamatsu, Ping Xu, Yusaku Nakabeppu, Shiba Tadayoshi, Ken Ichi Yamamoto, Katsuji Yoshioka

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We have identified four isoforms of c-Jun NH 2-terminal kinase (JNK)/stress-activated protein kinase-associated protein 1 (JSAP1), a scaffold protein that participates in JNK mitogen-activated protein kinase cascades, termed JSAP1a, JSAP1b, JSAP1c, and JSAP1d. The previously identified JSAP1 was renamed JSAP1a to avoid confusion. Analyses of the exon-intron structure of the jsap1 gene indicated that the isoforms are generated through alternative splicing involving exons 5 and 6. The mRNA expression levels of the JSAP1 isoforms differed among the mouse tissues examined. We also investigated the region of JSAP1 responsible for its interaction with JNK, and found that the JNK-binding domain is located between aa residues 201 and 217 in JSAP1a, which is encoded by part of exon 6. As all the JSAP1 isoforms contain this binding domain, we examined the binding affinity of the JSAP1 isoforms for JNK1, JNK2, and JNK3. JSAP1c and JSAP1d, which contain a 31-aa sequence not present in JSAP1a or JSAP1b, had a lower binding affinity for the JNKs, especially JNK3. These results suggest that JSAP1c and JSAP1d may attenuate the scaffolding activity of JSAP1a and/or JSAP1b in JNK cascades, especially the JNK3 cascades. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)229-234
Number of pages6
JournalGene
Volume255
Issue number2
DOIs
Publication statusPublished - Sep 19 2000

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Alternative Splicing
Protein Isoforms
Exons
Proteins
MAP Kinase Kinase 4
JNK Mitogen-Activated Protein Kinases
Heat-Shock Proteins
Introns
Protein Kinases
Messenger RNA
Genes

All Science Journal Classification (ASJC) codes

  • Genetics

Cite this

Ito, M., Akechi, M., Hirose, R., Ichimura, M., Takamatsu, N., Xu, P., ... Yoshioka, K. (2000). Isoforms of JSAP1 scaffold protein generated through alternative splicing. Gene, 255(2), 229-234. https://doi.org/10.1016/S0378-1119(00)00335-8

Isoforms of JSAP1 scaffold protein generated through alternative splicing. / Ito, Michihiko; Akechi, Mizuho; Hirose, Ryo; Ichimura, Michio; Takamatsu, Nobuhiko; Xu, Ping; Nakabeppu, Yusaku; Tadayoshi, Shiba; Yamamoto, Ken Ichi; Yoshioka, Katsuji.

In: Gene, Vol. 255, No. 2, 19.09.2000, p. 229-234.

Research output: Contribution to journalArticle

Ito, M, Akechi, M, Hirose, R, Ichimura, M, Takamatsu, N, Xu, P, Nakabeppu, Y, Tadayoshi, S, Yamamoto, KI & Yoshioka, K 2000, 'Isoforms of JSAP1 scaffold protein generated through alternative splicing', Gene, vol. 255, no. 2, pp. 229-234. https://doi.org/10.1016/S0378-1119(00)00335-8
Ito M, Akechi M, Hirose R, Ichimura M, Takamatsu N, Xu P et al. Isoforms of JSAP1 scaffold protein generated through alternative splicing. Gene. 2000 Sep 19;255(2):229-234. https://doi.org/10.1016/S0378-1119(00)00335-8
Ito, Michihiko ; Akechi, Mizuho ; Hirose, Ryo ; Ichimura, Michio ; Takamatsu, Nobuhiko ; Xu, Ping ; Nakabeppu, Yusaku ; Tadayoshi, Shiba ; Yamamoto, Ken Ichi ; Yoshioka, Katsuji. / Isoforms of JSAP1 scaffold protein generated through alternative splicing. In: Gene. 2000 ; Vol. 255, No. 2. pp. 229-234.
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