Metabolism of low molecular weight ribonucleic acids in early sea urchin embryos

Journal Article · Tue Apr 03 04:00:00 EST 1979 · Biochemistry; (United States)

DOI:https://doi.org/10.1021/bi00574a035· OSTI ID:5933152

Nijhawan, P; Marzluff, W F

There are three major low molecular weight RNAs (150 to 300 nucleotides) larger than 5S rRNA present in sea urchin embryos. Two of these are localized in the nucleus and one is localized in the cytoplasm. The nuclear species contain capped 5' termini, with a cap I structure. These RNAs are synthesized starting in late cleavage and continuing through pluteus. Relative to 5S RNA there is a 10-fold change in the rate of synthesis of these RNAs, due primarily to a decrease in their rate of transcription after blastula. The RNAs are metabolically stable and the nuclear RNA genes ae reiterated 50 to 100 times in the genome. Significant amounts of these RNAs are present in sea urchin eggs, enough to supply the embryo during early cleavage, prior to initiation of their synthesis.

• Research Organization: Florida State Univ., Tallahassee
• OSTI ID: 5933152
• Journal Information: Biochemistry; (United States), Journal Name: Biochemistry; (United States) Vol. 18:7; ISSN BICHA
• Country of Publication: United States
• Language: English

Related Subjects

550200* -- Biochemistry
551000 -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
ANIMALS
AQUATIC ORGANISMS
BIOSYNTHESIS
CELL CONSTITUENTS
CELL NUCLEI
COMPARATIVE EVALUATIONS
CYTOPLASM
DATA
DATA FORMS
ECHINODERMS
EGGS
EMBRYOS
EXPERIMENTAL DATA
INFORMATION
INVERTEBRATES
ISOLATED VALUES
METABOLISM
MOLECULAR WEIGHT
NUCLEIC ACIDS
NUMERICAL DATA
ONTOGENESIS
ORGANIC COMPOUNDS
RNA
SEA URCHINS
SYNTHESIS