Primary structure of the virus activating protease from chick embryo. Its identity with the blood clotting factor Xa.
Host cell proteases activating para- and orthomyxovirus fusion glycoprotein precursors play a crucial role in determining the viral tropism in infected organisms. We previously isolated such an endoprotease from the allantoic fluid of chick embryo and showed its close similarity to the activated form of blood clotting factor X (FXa) by partial amino acid sequencing. In this report, we have cloned and sequenced a cDNA of the protease, and show that it is encoded in a single gene as a preproform with all the functional and structural domains known to be characteristic of bovine or human FX, establishing the identity between the protease and FXa.
Suzuki
H
H
Shionogi Institute for Medical Science, Osaka, Japan.
Harada
A
A
Hayashi
Y
Y
Wada
K
K
Asaka
J
J
Gotoh
B
B
Ogasawara
T
T
Nagai
Y
Y
D000482:Allantois / Q000201:enzymology; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002417:Cattle; D002642:Chick Embryo; D002823:Chorion / Q000201:enzymology; D003001:Cloning, Molecular; D004792:Enzyme Precursors / Q000235:genetics; D015951:Factor Xa / Q000737:chemistry / Q000235:genetics*; D006801:Humans; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes; D012689:Sequence Homology, Nucleic Acid; D012697:Serine Endopeptidases / Q000737:chemistry / Q000235:genetics* / Q000302:isolation & purification
D004792:Enzyme Precursors; D015345:Oligonucleotide Probes; D012697:Serine Endopeptidases; C066527:virus activating protease; D015951:Factor Xa