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PMID: 2970640 Published · ppublish English Journal Article Research Support, U.S. Gov't, P.H.S.

The 289-amino acid E1A protein of adenovirus binds zinc in a region that is important for trans-activation.

Proceedings of the National Academy of Sciences of the United States of America ·Vol. 85 ·No. 17 ·1988-09-00 ·Pages 6450-4

Culp JS, Webster LC, Friedman DJ, Smith CL, Huang WJ, Wu FY, Rosenberg M, Ricciardi RP

Abstract

The E1A gene of adenovirus type 5 encodes two major proteins of 289 and 243 amino acid residues, which are identical except that the larger protein has an internal stretch of 46 amino acids required for efficient trans-activation of early viral promoters. This domain contains a consensus zinc finger motif (Cys-Xaa2-Cys-Xaa13-Cys-Xaa2-Cys) in which the cysteine residues serve as postulated ligands. Atomic absorption spectrophotometry applied to bacterially expressed E1A proteins revealed that the 289-amino acid protein binds one zinc ion, whereas the 243-amino acid protein binds no zinc. Replacing individual cysteine residues of the finger with other amino acids destroyed the trans-activating ability of the 289-amino acid protein, even when structurally or functionally conserved amino acids were substituted. These results strongly suggest that the zinc finger of the 46-amino acid domain is intimately linked to the ability of the large E1A protein to stimulate transcription of E1A-inducible promoters. Furthermore, zinc binding to one of the mutant finger proteins suggests either that only a precise finger structure formed by the tetrahedral coordination of zinc to the four consensus ligands is required for trans-activation or, possibly, that one of several neighboring histidine residues in various combinations with three of the consensus cysteine residues normally coordinates zinc. How the zinc finger in E1A might interact with DNA or protein to bring about trans-activation is discussed.

MeSH Terms
Adenovirus Early Proteins Adenoviruses, Human/genetics Amino Acid Sequence Antigens, Viral, Tumor/genetics Genetic Vectors HeLa Cells/metabolism Humans Molecular Sequence Data Mutation Oncogene Proteins, Viral/genetics,isolation & purification,metabolism Plasmids Protein Binding Transfection Zinc/metabolism
Chemicals
Adenovirus Early Proteins Antigens, Viral, Tumor Oncogene Proteins, Viral Zinc
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Culp J S
Molecular Genetics Department, Smith Kline & French Laboratories, King of Prussia, PA 19406.
Webster L C
Friedman D J
Smith C L
Huang W J
Wu F Y
Rosenberg M
Ricciardi R P
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
DOI
10.1073/pnas.85.17.6450
Published
1988-09-00
Pages
6450-4
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC281990
Subset
IM
Grants
NCI NIH HHS · CA-29797 · United States
NIGMS NIH HHS · GM-28057 · United States
External Links
PubMed source DOI: 10.1073/pnas.85.17.6450 PMC Full Text 免费全文 View journal details
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