Linked Life Data

8621386

Source:http://linkedlifedata.com/resource/pubmed/id/8621386

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
10
pubmed:dateCreated
1996-6-20
pubmed:abstractText
Recombinant Fv derivative of the high affinity murine anti-fluorescein monoclonal antibody 4-4-20 was constructed and expressed in high yields, relative to the single chain antibody (SCA) derivative (2 3-fold), in Escherichia coli. Both variable heavy (VH) and variable light (VL) domains, that accumulated as insoluble inclusion bodies, were isolated, denatured, mixed, refolded, and affinity-purified to yield active Fv 4-4-20. Affinity-purified Fv 4-4-20 showed identical ligand binding properties compared with the SCA construct, both were slightly lower than the affinities expressed by Fab or IgG 4-4-20. Proper protein folding was shown to be domain-independent by in vitro mixing of individually refolded variable domains to yield functional Fv protein. In solid phase and solution phase assays, Fv 4-4-20 closely approximated the SCA derivative in terms of both idiotype and metatype, confirming identical active site structures and conformations. The equilibrium dissociation constant (Kd) for the VL/VH association (1.43 x 10(-7) M), which was determined using the change in fluorescein spectral properties upon ligand binding, was relatively low considering the high affinity displayed by the Fv protein for fluorescein (Kd, 2.9 x 10(-10) M). Thus, domain-domain stability in the Fv and SCA 4-4-20 proteins cannot be the sole cause of reduced affinity (2-3-fold) for fluorescein as compared with the Fab or IgG form of 4-4-20. With their identical ligand binding and structural properties, the decreased SCA or Fv affinity for fluorescein must be an ultimate consequence of deletion of the CH1 and CL constant domains. Collectively, these results verify the importance of constant domain interactions in antibody variable domain structure-function analyses and future antibody engineering endeavors.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
8
pubmed:volume
271
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
5338-46
pubmed:dateRevised
2011-11-17
pubmed:meshHeading
pubmed-meshheading:8621386-Amino Acid Sequence, pubmed-meshheading:8621386-Animals, pubmed-meshheading:8621386-Antibodies, Monoclonal, pubmed-meshheading:8621386-Bacterial Outer Membrane Proteins, pubmed-meshheading:8621386-Binding Sites, Antibody, pubmed-meshheading:8621386-Circular Dichroism, pubmed-meshheading:8621386-Cloning, Molecular, pubmed-meshheading:8621386-Enzyme-Linked Immunosorbent Assay, pubmed-meshheading:8621386-Escherichia coli, pubmed-meshheading:8621386-Fluorescein, pubmed-meshheading:8621386-Fluoresceins, pubmed-meshheading:8621386-Fluorescent Dyes, pubmed-meshheading:8621386-Immunoglobulin Fab Fragments, pubmed-meshheading:8621386-Immunoglobulin G, pubmed-meshheading:8621386-Immunoglobulin Light Chains, pubmed-meshheading:8621386-Immunoglobulin Variable Region, pubmed-meshheading:8621386-Kinetics, pubmed-meshheading:8621386-Mice, pubmed-meshheading:8621386-Mice, Inbred BALB C, pubmed-meshheading:8621386-Models, Structural, pubmed-meshheading:8621386-Molecular Sequence Data, pubmed-meshheading:8621386-Protein Conformation, pubmed-meshheading:8621386-Recombinant Proteins, pubmed-meshheading:8621386-Structure-Activity Relationship
pubmed:year
1996
pubmed:articleTitle
Comparative properties of the single chain antibody and Fv derivatives of mAb 4-4-20. Relationship between interdomain interactions and the high affinity for fluorescein ligand.
pubmed:affiliation
Department of Microbiology, University of Illinois, Urbana, 61801, USA.
pubmed:publicationType
Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't