Cited by 122DNA Repair MechanismsNuclear Structure and FunctionEnzyme Structure and Function

Mutational analysis of the structure and function of the xeroderma pigmentosum group A complementing protein. Identification of essential domains for nuclear localization and DNA excision repair.

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Miyamoto, I, Miura, N, Niwa, H, Miyazaki, J, Tanaka, K·1992·Journal of Biological Chemistry

Abstract

We showed previously that the xeroderma pigmentosum group A complementing (XPAC) protein involved in the DNA excision repair pathway contains a zinc-finger motif and is localized in the nucleus of normal human cells. For detailed structural and functional analyses of the XPAC protein, we constructed various XPAC cDNAs by site-directed mutagenesis and isolated permanent cell lines expressing mutant proteins. Immunofluorescent analysis of these lines indicated that the nuclear localization signal is located in the region encoded by Exon 1, especially centered at amino acids 30-42. A UV survival study showed that regions from Exons 2 through 6 were essential for DNA repair function, but that Exon 1 was not. Interestingly, deletion of the glutamic acid cluster in the region encoded by Exon 2 resulted in a dramatic loss of DNA repair activity. Furthermore, replacements of each of the 4 cysteines supposed to form a zinc-finger structure in the region encoded by Exon 3 by serine or glycine resulted in similar levels of loss of repair activity. These results suggest that all 4 cysteines forming a zinc-finger structure and also the glutamic acid cluster are important for DNA repair function.

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Crossref · 10.1016/s0021-9258(19)49821-9

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Authors
Miyamoto, I., Miura, N., Niwa, H., Miyazaki, J., & Tanaka, K.
Affiliations
Hyogo Medical University (JP)
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
1992-06
Volume
267
Issue
17
Pages
12182-12187
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2127547755
Cited by
122
References
25
Citations by year
2026: 1 · 2023: 1 · 2022: 2 · 2021: 1 · 2020: 1 · 2018: 1 · 2017: 4 · 2016: 4 · 2015: 1 · 2014: 2 · 2013: 4 · 2012: 1
FWCI
2.91
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
excision repair, nucleotide excision repair, zinc finger, nuclear localization signal, cysteine residues, site-directed mutagenesis, UV-induced DNA damage, protein structure-function relationship
MeSH terms
Amino Acid Sequence, Base Sequence, Cell Line, Cell Nucleus, DNA, DNA Repair, DNA-Binding Proteins, Escherichia coli, Fluorescent Antibody Technique, Humans, Molecular Sequence Data, Recombinant Proteins, Structure-Activity Relationship, Transfection, Xeroderma Pigmentosum, Mutagenesis, Site-Directed, Zinc Fingers, Xeroderma Pigmentosum Group A Protein

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