title: DUB-1, a fate determinant of dynein heavy chain in B-lymphocytes, is regulated by the ubiquitin-proteasome pathway.
abstract: Ubiquitination and deubiquitination of post-translational modification play counter roles in determining the fate of protein function in eukaryotic system for maintaining the cellular homeostasis. Even though novel family members of growth-regulating deubiquitinating enzymes (DUB-1 and DUB-2) have been identified, their target proteins and functions are poorly understood. Dub genes encoding DUB-1 and DUB-2 are immediate-early genes and are induced in response to cytokine stimuli rapidly and transiently. In order to explore the possible proteins regulated by DUB-1, we performed the matrix assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analysis followed by immunoprecipitation. We confirmed that DUB-1 interacts with dynein heavy chain, which is known to regulate the movement of organelles and microtubule binding ability. In addition, structural and immunoprecipitation analyses revealed that DUB-1 contains a putative PEST motif and is polyubiquitinated, indicating that DUB-1 is also regulated by the ubiquitin-proteasome pathway.
authors.affiliation: Cell and Gene Therapy Research Institute, Graduate School of Life Science and Biotechnology, Pochon CHA University, CHA General Hospital, Seoul, Republic of Korea.
authors.forename: Min-Young
authors.initials: MY
authors.lastname: Lee
authors.forename: Brijesh S
authors.initials: BS
authors.lastname: Ajjappala
authors.forename: Myung-Sun
authors.initials: MS
authors.lastname: Kim
authors.forename: Yu-Kyoung
authors.initials: YK
authors.lastname: Oh
authors.forename: Kwang-Hyun
authors.initials: KH
authors.lastname: Baek
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D001402:B-Lymphocytes / Q000201:enzymology*; D019556:COS Cells; D002522:Chlorocebus aethiops; D004398:Dyneins / Q000378:metabolism*; D010450:Endopeptidases / Q000737:chemistry / Q000378:metabolism*; D017874:Immediate-Early Proteins / Q000737:chemistry / Q000378:metabolism*; D051379:Mice; D008969:Molecular Sequence Data; D046988:Proteasome Endopeptidase Complex / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D025801:Ubiquitin / Q000378:metabolism*
chemical_list: D017874:Immediate-Early Proteins; D025801:Ubiquitin; C099271:Dub1 protein, mouse; D010450:Endopeptidases; D046988:Proteasome Endopeptidase Complex; D004398:Dyneins