An alternatively spliced transcript of the PHD3 gene retains prolyl hydroxylase activity.
Cellular response to limiting oxygen levels is managed, in part, by the transcription factor hypoxia-inducible factor 1 (HIF-1), and the prolyl hydroxylase (PHD) family of oxygen-requiring enzymes. In the process of analyzing the expression of PHD3, we observed the presence of two alternatively processed PHD3 transcripts, designated PHD3Delta1 and PHD3Delta4 . The expression of both PHD3 and PHD3Delta1 was observed in all tissues and cell lines tested, although the expression of the novel PHD3Delta4 appeared to be restricted to primary cancer tissues. The function of PHD3Delta4 was assessed in transfection experiments showing a preserved prolyl hydroxylase activity. We would submit that PHD3 variants generated by alternative splicing may be intrinsically involved in the complex system of oxygen sensing.
Unidad Mixta de Investigación Centro Nacional de Investigaciones Cardiovasculares Carlos III-Universitat de València, Avenida Blasco-Ibañez 15-17, 46.010 Valencia, Spain.
Ana M
AM
Cervera
Nadezda
N
Apostolova
Francisco
F
Luna-Crespo
Alejandra
A
Sanjuan-Pla
Remedios
R
Garcia-Bou
Kenneth J
KJ
McCreath
D017398:Alternative Splicing; D000595:Amino Acid Sequence; D001483:Base Sequence; D045744:Cell Line, Tumor; D049308:Dioxygenases; D006801:Humans; D006900:Hydroxylation; D051795:Hypoxia-Inducible Factor 1, alpha Subunit / Q000502:physiology; D064799:Hypoxia-Inducible Factor-Proline Dioxygenases; D008969:Molecular Sequence Data; D011393:Procollagen-Proline Dioxygenase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
C497442:HIF1A protein, human; D051795:Hypoxia-Inducible Factor 1, alpha Subunit; D049308:Dioxygenases; D011393:Procollagen-Proline Dioxygenase; C488894:EGLN3 protein, human; D064799:Hypoxia-Inducible Factor-Proline Dioxygenases