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J. Biol. Chem., Vol. 275, Issue 22, 16723-16729, June 2, 2000
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From the The molecular genetic basis of the P histo-blood
group system has eluded characterization despite extensive studies of
the biosynthesis of the P1, P, and Pk
glycolipids. The main controversy has been whether a single or two
distinct UDP-Gal:Gal The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EMBL Data Bank with accession number(s) AJ245581.
Cloning and Expression of the Histo-blood Group Pk
UDP-galactose:Gal
1-4Glc
1-Cer
1,4-Galactosyltransferase
MOLECULAR GENETIC BASIS OF THE p PHENOTYPE*
§,
,
,
,
,
§§
School of Dentistry, University of
Copenhagen, Nørre Allé 20, 2200 Copenhagen N, Denmark, the
§ Regional Center for Blood Transfusion and Clinical
Immunology, Aalborg Hospital, 9000 Aalborg, Denmark, ¶ CNRS
UMR 1598, Institut Gustave Roussy, 94805 Villejuif Cedex, France, the
Complex Carbohydrate Research Center, University of Georgia,
Athens, Georgia 30602, the ** Department of Cell Surface Biochemistry,
Northwest Hospital, Seattle, Washington 98125, and the

Department of Transfusion Medicine, Umeå
University Hospital, S-901 85 Umeå, Sweden
1-R 4-
-galactosyltransferases catalyze the
syntheses of the structurally related P1 and Pk
antigens. The P1 polymorphism is linked to 22q11.3-ter.
Data base searches with the coding region of an
4GlcNAc-transferase identified a novel homologous gene at 22q13.2 designated
4Gal-T1. Expression of full coding constructs of
4Gal-T1 in insect cells revealed it encoded Pk but not P1 synthase
activity. Northern analysis showed expression of the transcript
correlating with Pk synthase activity and antigen
expression in human B cell lines. Transfection of
Pk-negative Namalwa cells with
4Gal-T1 resulted in
strong Pk expression. A single homozygous missense
mutation, M183K, was found in six Swedish individuals of the rare p
phenotype, confirming that
4Gal-T1 represented the Pk
gene. Sequence analysis of the coding region of
4Gal-T1 in
P1+/
individuals did not reveal polymorphisms correlating
with P1P2 typing.
*
This work was supported by the PhD Foundation Aalborg
Sygehus, Aalborg Frivillige Bloddonorers Foundation, Nordjyllands Amts Foundation, Det Obelse Familiefond, Peder Kristen Tøfting, and Dagmar
Tøftings Foundation, Ebba and Aksel Schølins Foundation, the Danish
Cancer Society, the Velux Foundation, the Danish Research Council,
Grant 5 P41 RR05351 from the National Institutes of Health Resource
Center for Biomedical Complex Carbohydrates, and Grant ARC9588 from the
Association pour la Recherche sur le Cancer.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in
accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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