Linked Life Data

1325680

Source:http://linkedlifedata.com/resource/pubmed/id/1325680

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1992-10-6
pubmed:abstractText
Mouse C127 epithelioid cells were genetically engineered to produce biologically active gamma-carboxylated human protein S. A full length human protein S cDNA was cloned into a bovine papilloma virus (BPV) based shuttle vector under the transcriptional control of the Moloney murine sarcoma virus enhancer and the mouse metallothionein promoter. Stable expression was obtained in transfected C127 cells. Expression of gamma-carboxylated protein S was dependent on the presence of vitamin K in the culture medium. Protein sequence analysis showed that recombinant and plasma protein S have the same amino terminal sequence. Analysis of specific post-translationally modified amino acids shows that recombinant protein S is fully gamma-carboxylated and fully beta-hydroxylated. Immunoblotting analysis using polyclonal and monoclonal antibodies shows that recombinant protein S has a slightly higher molecular weight than plasma protein S. After N-Glycanase treatment, identical molecular weights are observed for recombinant and plasma protein S, indicating that the difference is caused by differences in the N-linked carbohydrate side chains. Recombinant protein S also demonstrates normal cofactor activity for activated protein C in a clotting assay. Binding studies with the complement component, C4b-binding protein (C4BP), shows that recombinant protein S binds to C4BP with the same apparent affinity as plasma protein S. Two variant molecules are also tested for their binding to C4BP. The first variant has a replacement of amino acid residue leu-608 by val and was designated B variant. The second variant has three alterations, at positions 609, 611 and 612 where the acidic amino acid residues asp, asp and glu were replaced by asn, asn and gln, respectively and this variant was designated C variant.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0340-6245
pubmed:author
pubmed:issnType
Print
pubmed:day
4
pubmed:volume
67
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
526-32
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed-meshheading:1325680-Amino Acid Sequence, pubmed-meshheading:1325680-Animals, pubmed-meshheading:1325680-Base Sequence, pubmed-meshheading:1325680-Blood Proteins, pubmed-meshheading:1325680-Carrier Proteins, pubmed-meshheading:1325680-Cells, Cultured, pubmed-meshheading:1325680-Complement Inactivator Proteins, pubmed-meshheading:1325680-DNA Transposable Elements, pubmed-meshheading:1325680-Genetic Variation, pubmed-meshheading:1325680-Genetic Vectors, pubmed-meshheading:1325680-Glutamine, pubmed-meshheading:1325680-Glycoproteins, pubmed-meshheading:1325680-Humans, pubmed-meshheading:1325680-Leucine, pubmed-meshheading:1325680-Molecular Sequence Data, pubmed-meshheading:1325680-Mutagenesis, Site-Directed, pubmed-meshheading:1325680-Protein Binding, pubmed-meshheading:1325680-Protein S, pubmed-meshheading:1325680-Recombinant Proteins
pubmed:year
1992
pubmed:articleTitle
Expression and characterization of recombinant human protein S in heterologous cells--studies of the interaction of amino acid residues leu-608 to glu-612 with human C4b-binding protein.
pubmed:affiliation
Department of Haematology, University Hospital Utrecht, The Netherlands.
pubmed:publicationType
Journal Article