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M9550838.TXT
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1995-03-25
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Document 0838
DOCN M9550838
TI Growth and developmental functions of a human immunodeficiency virus
Tat-binding protein/26S protease subunit homolog from Dictyostelium
discoideum.
DT 9505
AU Cao JG; Firtel RA; Department of Biology, University of California at
San Diego, La; Jolla 92093-0634.
SO Mol Cell Biol. 1995 Mar;15(3):1725-36. Unique Identifier : AIDSLINE
MED/95166258
AB We have characterized a newly identified gene from Dictyostelium
discoideum, DdTBP alpha, that encodes a member of the family of
eukaryotic proteins. These proteins contain a conserved ATPase domain,
include subunits of the 26S protease subunit, and are homologous to the
mammalian human immunodeficiency virus Tat-binding protein TBP1. While
information indicates that some family members are involved in the
regulation of transcription in mammalian and yeast cells during growth,
these proteins are also involved in other cellular functions, and
nothing is known about their possible function in multicellular
development. The Dictyostelium DdTBP alpha gene is developmentally
regulated, with its expression at the highest levels occurring during
growth and early development. The gene is present in two copies in the
genome. Disruption of one copy by homologous recombination leads to
aberrant morphogenesis, which lasts from the formation of the first
finger until the onset of culmination. The gene appears to be essential
for growth since we were unable to obtain a complete null phenotype and
since expression of an inducible antisense construct in the partial null
background resulted in cell death. Expression of the antisense construct
during development accentuated the partial null phenotype and also
resulted in very abnormal fruiting bodies. Overexpression of DdTBP alpha
from its own promoter leads to very large multinucleated vegetative
cells when the cells are grown in suspension culture. When the cells are
plated onto petri dishes in growth medium, they rapidly split into
multiple cells containing one to two nuclei, in a manner similar to that
of wild-type cells. Overexpressing cells are significantly delayed in
forming a multicellular aggregate, but development proceeds normally
once the first finger stage is reached. The results indicate that DdTBP
alpha plays an important role in regulating both growth and
morphogenesis in D. discoideum.
DE Adenosinetriphosphatase/GENETICS Amino Acid Sequence Animal Cell
Division Cloning, Molecular Comparative Study Conserved Sequence
Dictyostelium/CYTOLOGY/*GENETICS/METABOLISM Gene Expression Gene
Products, tat/*GENETICS Genes, Fungal Genomic Library
HIV/*GENETICS/METABOLISM Kinetics Macromolecular Systems Molecular
Sequence Data Peptide Hydrolases/BIOSYNTHESIS/*GENETICS/ISOLATION &
PURIF Promoter Regions (Genetics) Recombinant
Proteins/BIOSYNTHESIS/ISOLATION & PURIF Restriction Mapping Sequence
Homology, Amino Acid Support, U.S. Gov't, P.H.S. JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).