Abstract: A protein participating in the addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia; a gene coding this protein; a mutant of this gene; a vector carrying the mutant gene; a yeast strain belonging to the genus Pichia having been transformed by this vector; a process for producing a protein with reduction of an acidic sugar chain by using the transformed yeast strain; and a glycoprotein thus produced, are described.

Abstract: A gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia is described. Also described is a means of suppressing a functional product encoded by the gene.

Abstract: The present invention intends to find out a gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia and provide a means of controlling the same. The present invention also intends to provide a process for producing a protein with reduction of an acidic sugar chain by using the thus controlled yeast strain belonging to the genus Pichia. Namely, the present invention includes a protein participating in the addition of mannose phosphate to a sugar chain of a glycoprotein; a gene coding this protein; a mutant of this gene; a vector carrying the mutant gene; a yeast strain belonging to the genus Pichia having been transformed by this vector; a process for producing a protein with reduction of an acidic sugar chain by using the transformed yeast strain; and a glycoprotein thus produced.

Abstract: The present invention intends to find out a gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia and provide a means of controlling the same. The present invention also intends to provide a process for producing a protein with reduction of an acidic sugar chain by using the thus controlled yeast strain belonging to the genus Pichia. Namely, the present invention includes a protein participating in the addition of mannose phosphate to a sugar chain of a glycoprotein; a gene coding this protein; a mutant of this gene; a vector carrying the mutant gene; a yeast strain belonging to the genus Pichia having been transformed by this vector; a process for producing a protein with reduction of an acidic sugar chain by using the transformed yeast strain; and a glycoprotein thus produced.

Abstract: The present invention intends to find out a gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia and provide a means of controlling the same. The present invention also intends to provide a process for producing a protein with reduction of an acidic sugar chain by using the thus controlled yeast strain belonging to the genus Pichia. Namely, the present invention includes a protein participating in the addition of mannose phosphate to a sugar chain of a glycoprotein; a gene encoding this protein; a mutant of this gene; a vector carrying the mutant gene; a yeast strain belonging to the genus Pichia having been transformed by this vector; a process for producing a protein with reduction of an acidic sugar chain by using the transformed yeast strain; and a glycoprotein thus produced.

Abstract: The present invention intends to find out a gene participating in addition of mannose phosphate to a sugar chain of a glycoprotein originating in a yeast belonging to the genus Pichia and provide a means of controlling the same. The present invention also intends to provide a process for producing a protein with reduction of an acidic sugar chain by using the thus controlled yeast strain belonging to the genus Pichia.

Abstract: A method of producing a virus-inactivated protein-containing composition from a protein-containing composition which may be contaminated with virus. The method according to the present invention permits production of pharmaceutically safer virus-inactivated protein preparations without spoiling the protein activity.

Abstract: A stable aqueous thrombin solution containing thrombin and a sugar and an amino acid as a stabilizer is disclosed. According to the present invention, there is provided a stable aqueous thrombin solution.

Abstract: An aqueous solution containing fibrinogen is heated in the presence of at least a sugar, an amino acid and a magnesium salt to thereby inactivate virus(es) possibly contaminating said fibrinogen. According to this process, the inactivation of the contaminating viruses can be achieved while maintaining the activity of the fibrinogen. Thus a highly safe fibrinogen preparation of excellent qualities can be prepared on an industrial scale.

Abstract: An aqueous solution containing thrombin is heated in the presence of at least one stabilizer selected from various sugars to thereby inactivate viruses possibly contaminating said thrombin. According to this process, the inactivation of the contaminating viruses can be achieved while stably maintaining the thrombin. The stabilizing effect of this process can be further enhanced by using an amino acid as a stabilizer in combination with the sugar.