Recombinant glutamate carboxypeptidase II (prostate specific membrane antigen--PSMA)--cellular localization and bioactivity analyses |
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Authors: | Meighan Mark A Dickerson Marie T Glinskii Olga Glinsky Vladislav V Wright George L Deutscher Susan L |
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Affiliation: | (1) Department of Biochemistry, University of Missouri, Columbia, Missouri;(2) Harry S. Truman Memorial Veteran's Hospital, Columbia, Missouri;(3) Department of Microbiology and Molecular Cell Biology and Virginia Prostate Center, Eastern Virginia Medical School, Norfolk, Virginia |
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Abstract: | Glutamate Carboxypeptidase II (also known as Prostate Specific Membrane Antigen—PSMA) is an important marker in the diagnosis of prostate cancer, however, relatively little is known about its biochemical and structure-function characteristics. We have expressed mutant forms of PSMA and have started to address the roles of three putative domains of PSMA in its cellular localization and peptidase activity. Three mutants, a full-length recombinant PSMA (rPSMA-FL), one expressing only the proposed extracellular domain of PSMA (rPSMA-ECD) and one form omitting the proposed transmembrane domain (rPSMA-TMD) have been produced in human cells via a mammalian expression vector system. We show that rPSMA-FL is associated with the cell surface membrane; so too is rPSMA-TMD even though it lacks the proposed transmembrane domain, whereas rPSMA-ECD has a cytosolic localization. Only rPSMA-FL retains functional hydrolytic activity and is similarly glycosylated to PSMA found in the cultured prostate cancer cell line LNCaP. |
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Keywords: | Prostate cancer transmembrane domain glycosylation tumor marker phage display |
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