title: Interaction between proliferating cell nuclear antigen and JUN-activation-domain-binding protein 1 in the meristem of rice, Oryza sativa L.
abstract: The eukaryotic polymerase processivity factor, proliferating cell nuclear antigen (PCNA), interacts with many cell cycle-regulator proteins and with proteins involved in the mechanisms of DNA replication and repair. In the present study using two-hybrid analysis with PCNA from rice, Oryza sativa L. cv. Nipponbare (OsPCNA), we found that OsPCNA interacted in vitro and in vivo with rice JUN-activation-domain-binding protein 1 (OsJab1), which is known as COP9/signalsome subunit 5. Both OsPCNA and OsJab1 transcripts were expressed strongly in the shoot apical meristem and weakly in young leaves, flag leaves, ears, roots and root tips. No expression was detected in the mature leaves. The OsPCNA and OsJab1 proteins were expressed and accumulated mostly in the shoot apical meristem and ears, suggesting that OsJab1 is involved in cell proliferation in cooperation with OsPCNA. The role of OsPCNA with OsJab1 in plant DNA proliferation is discussed.
authors.affiliation: Department of Applied Biological Science, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda-shi, 278-8510, Chiba-ken, Japan.
authors.forename: Taichi
authors.initials: T
authors.lastname: Yamamoto
authors.forename: Seisuke
authors.initials: S
authors.lastname: Kimura
authors.forename: Yoko
authors.initials: Y
authors.lastname: Mori
authors.forename: Yukinobu
authors.initials: Y
authors.lastname: Uchiyama
authors.forename: Toyotaka
authors.initials: T
authors.lastname: Ishibashi
authors.forename: Junji
authors.initials: J
authors.lastname: Hashimoto
authors.forename: Kengo
authors.initials: K
authors.lastname: Sakaguchi
mesh_terms: D000595:Amino Acid Sequence; D002874:Chromosome Mapping; D032461:Chromosomes, Plant / Q000235:genetics; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D020869:Gene Expression Profiling; D018519:Meristem / Q000378:metabolism*; D008969:Molecular Sequence Data; D012275:Oryza / Q000235:genetics / Q000378:metabolism*; D010447:Peptide Hydrolases; D010802:Phylogeny; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D018809:Proliferating Cell Nuclear Antigen / Q000378:metabolism*; D011485:Protein Binding; D018749:RNA, Plant / Q000032:analysis / Q000235:genetics; D017386:Sequence Homology, Amino Acid; D013395:Sucrose / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D004268:DNA-Binding Proteins; D018809:Proliferating Cell Nuclear Antigen; D018749:RNA, Plant; D014157:Transcription Factors; D013395:Sucrose; D010447:Peptide Hydrolases