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Primary structure of human thyroglobulin deduced from the sequence of its 8448-base complementary DNA
European Journal of Biochemistry
|June 15, 1987
Summary
Researchers sequenced the human thyroglobulin (hTG) messenger RNA (mRNA), revealing a large protein structure. This study details the hTG monomer
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Thyroglobulin (hTG) is a key protein in thyroid hormone synthesis.
- Understanding hTG's structure is crucial for thyroid function research.
Purpose of the Study:
- To clone and sequence the messenger RNA (mRNA) encoding human thyroglobulin.
- To analyze the structural features and potential functional domains of the hTG monomer.
Main Methods:
- mRNA isolation and sequencing.
- Bioinformatic analysis of nucleotide and amino acid sequences.
- Homology searches against protein databases.
Main Results:
- The human thyroglobulin mRNA sequence is 8301 nucleotides long, encoding a 2767 amino acid preprotein.
- The mature hTG monomer (2748 amino acids) contains repetitive units in 70% of its N-terminal region.
- The C-terminal 30% shows homology to acetylcholinesterase and contains thyroid hormone synthesis sites.
Conclusions:
- The complete nucleotide sequence of human thyroglobulin mRNA has been determined.
- Structural analysis reveals distinct regions within the hTG monomer, including repetitive units and a homologous domain.
- Thyroid hormone synthesis sites are localized at the monomer's ends, while glycosylation sites are dispersed.