The callus associated protein (CAP) gene of Nicotiana tabacum

Isolation, characterization, and evidence for possible function as a transcriptional factor

Claudio L. Afonso, David W Galbraith

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We have identified a callus associated protein (CAP) as a new molecular marker for proliferative growth and early cellular differentiation in higher plants. Antiserum directed against the Sorghum callus associated protein (CAP) was employed to isolate a cDNA clone (CAP-C2) from an expression library prepared from mRNA from actively dividing cell suspension cultures of Nicotiana tabacum L. cv. xanthi. The derived amino acid sequence contained structural features of eukaryotic transcriptional factors, including three putative zinc fingers, three activator domains, and a nuclear localization signal. A fusion protein formed between part of the CAP-C2 polypeptide and Escherichia coli beta-glucuronidase specifically accumulated within the nuclei of transfected protoplasts, suggesting a nuclear localization for the CAP protein. Increased levels of expression of CAP in vivo were observed in actively proliferating tobacco tissues, whereas expression in vitro was induced when mature, differentiated explants proliferated into callus or cell suspensions. A 6.2 kb unstable mRNA and two low-abundance nuclear proteins (p66 and p68) containing epitopes encoded by CAP-C2 accumulated in plant tissues undergoing proliferative growth but were absent in mature, differentiated tissues. The corresponding genes were also present in Nicotiana sylvestris and Petunia hybrida

Original languageEnglish (US)
Pages (from-to)44-54
Number of pages11
JournalIn Vitro Cellular and Developmental Biology - Plant
Volume30
Issue number1
DOIs
StatePublished - Jan 1994

Fingerprint

Bony Callus
Nicotiana tabacum
Tobacco
callus
transcription factors
Proteins
genes
proteins
Tissue
cell suspension culture
Suspensions
Petunia
Nicotiana sylvestris
Nuclear Localization Signals
nuclear localization signals
Messenger RNA
Petunia hybrida
Sorghum
Protoplasts
zinc finger motif

Keywords

  • callus associated protein
  • gene expression
  • growth
  • Nicotiana tabacum
  • nuclear localization
  • zinc-fingers

ASJC Scopus subject areas

  • Biotechnology
  • Plant Science
  • Embryology
  • Developmental Biology
  • Cell Biology

Cite this

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title = "The callus associated protein (CAP) gene of Nicotiana tabacum: Isolation, characterization, and evidence for possible function as a transcriptional factor",
abstract = "We have identified a callus associated protein (CAP) as a new molecular marker for proliferative growth and early cellular differentiation in higher plants. Antiserum directed against the Sorghum callus associated protein (CAP) was employed to isolate a cDNA clone (CAP-C2) from an expression library prepared from mRNA from actively dividing cell suspension cultures of Nicotiana tabacum L. cv. xanthi. The derived amino acid sequence contained structural features of eukaryotic transcriptional factors, including three putative zinc fingers, three activator domains, and a nuclear localization signal. A fusion protein formed between part of the CAP-C2 polypeptide and Escherichia coli beta-glucuronidase specifically accumulated within the nuclei of transfected protoplasts, suggesting a nuclear localization for the CAP protein. Increased levels of expression of CAP in vivo were observed in actively proliferating tobacco tissues, whereas expression in vitro was induced when mature, differentiated explants proliferated into callus or cell suspensions. A 6.2 kb unstable mRNA and two low-abundance nuclear proteins (p66 and p68) containing epitopes encoded by CAP-C2 accumulated in plant tissues undergoing proliferative growth but were absent in mature, differentiated tissues. The corresponding genes were also present in Nicotiana sylvestris and Petunia hybrida",
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T1 - The callus associated protein (CAP) gene of Nicotiana tabacum

T2 - Isolation, characterization, and evidence for possible function as a transcriptional factor

AU - Afonso, Claudio L.

AU - Galbraith, David W

PY - 1994/1

Y1 - 1994/1

N2 - We have identified a callus associated protein (CAP) as a new molecular marker for proliferative growth and early cellular differentiation in higher plants. Antiserum directed against the Sorghum callus associated protein (CAP) was employed to isolate a cDNA clone (CAP-C2) from an expression library prepared from mRNA from actively dividing cell suspension cultures of Nicotiana tabacum L. cv. xanthi. The derived amino acid sequence contained structural features of eukaryotic transcriptional factors, including three putative zinc fingers, three activator domains, and a nuclear localization signal. A fusion protein formed between part of the CAP-C2 polypeptide and Escherichia coli beta-glucuronidase specifically accumulated within the nuclei of transfected protoplasts, suggesting a nuclear localization for the CAP protein. Increased levels of expression of CAP in vivo were observed in actively proliferating tobacco tissues, whereas expression in vitro was induced when mature, differentiated explants proliferated into callus or cell suspensions. A 6.2 kb unstable mRNA and two low-abundance nuclear proteins (p66 and p68) containing epitopes encoded by CAP-C2 accumulated in plant tissues undergoing proliferative growth but were absent in mature, differentiated tissues. The corresponding genes were also present in Nicotiana sylvestris and Petunia hybrida

AB - We have identified a callus associated protein (CAP) as a new molecular marker for proliferative growth and early cellular differentiation in higher plants. Antiserum directed against the Sorghum callus associated protein (CAP) was employed to isolate a cDNA clone (CAP-C2) from an expression library prepared from mRNA from actively dividing cell suspension cultures of Nicotiana tabacum L. cv. xanthi. The derived amino acid sequence contained structural features of eukaryotic transcriptional factors, including three putative zinc fingers, three activator domains, and a nuclear localization signal. A fusion protein formed between part of the CAP-C2 polypeptide and Escherichia coli beta-glucuronidase specifically accumulated within the nuclei of transfected protoplasts, suggesting a nuclear localization for the CAP protein. Increased levels of expression of CAP in vivo were observed in actively proliferating tobacco tissues, whereas expression in vitro was induced when mature, differentiated explants proliferated into callus or cell suspensions. A 6.2 kb unstable mRNA and two low-abundance nuclear proteins (p66 and p68) containing epitopes encoded by CAP-C2 accumulated in plant tissues undergoing proliferative growth but were absent in mature, differentiated tissues. The corresponding genes were also present in Nicotiana sylvestris and Petunia hybrida

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