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Cell Growth & Differentiation, Vol 7, Issue 2 271-280, Copyright © 1996 by American Association of Cancer Research


ARTICLES

Cloning of a novel nucleolar guanosine 5'-triphosphate binding protein autoantigen from a breast tumor

J Racevskis, A Dill, R Stockert and SA Fineberg
Department of Oncology, Montefiore and Albert Einstein Cancer Center, Bronx, New York 10467, USA.

A cDNA clone encoding an immunoreactive autoantigen (Ngp-1) was isolated by screening lambda gt11 human ductal breast tumor expression libraries with autologous patient serum. The complete 2.3-kb nucleotide sequence of the cDNA was found to contain an open reading frame that could encode a protein of 731 amino acids. The predicted amino acid sequence contains a high concentration of charged amino acids in the carboxy terminal quarter of the molecule, three guanosine 5'-triphosphate (GTP)-binding protein motifs, and a consensus nuclear localization signal. The arrangement and spacing of the GTP-binding protein motifs indicate that Ngp-1 belongs to a newly described subfamily of GTPases. Except for the consensus motifs, neither nucleotide sequence, nor the predicted amino acid sequence of the Ngp-1 cDNA showed the slightest homology to any vertebrate gene product sequence listed in the databases. Northern blot analysis showed the 2.3-kb transcript to be ubiquitously expressed at relatively low levels in all human tissues tested, with the highest level of expression in the testes. Immunohistochemical analysis of tissue sections with affinity-purified antiserum raised against a recombinant Ngp-1 protein revealed that the antigen was exclusively localized to the nucleolus and nucleolar organizer regions in all cell types analyzed.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1996 by the American Association of Cancer Research.