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R Woodworth

Publications and source records attributed to R Woodworth.

3 recordsLinked to original sources

Mutagenesis of the aspartic acid ligands in human serum transferrin: lobe-lobe interaction and conformation as revealed by antibody, receptor-binding and iron-release studies.

Recombinant non-glycosylated human serum transferrin and mutants in which the liganding aspartic acid (D) in one or both lobes was changed to a serine residue (S) were produced in a mammalian cell system and purified from the tissue culture media. Significant downfield shifts of 20, 30, and 45 nm in the absorption maxima were found for the D63S-hTF, D392S-hTF and the double mutant, D63S/D392S-hTF when compared to wild-type hTF. A monoclonal antibody to a sequential epitope in the C-lobe of hTF reported affinity differences between the apo- and iron-forms of each mutant and the control. Cell-binding studies performed under the same buffer conditions used for the antibody work clearly showed that the mutated lobe(s) had an open cleft. It is not clear whether the receptor itself may play a role in promoting the open conformation or whether the iron remains in the cleft.

Antigen-Antibody Reactions↗

Zeta sedimentation ratio in rheumatic disease. Comparison of the zeta sedimentation ratio with the Wintrobe and Westergren sedimentation rates.

The zeta sedimentation ratios (ZSR) of 104 normal subjects and 106 rheumatology clinic patients were compared with their Westergren and Wintrobe erythrocyte sedimentation rates (ESR). The mean ZSR for normal subjects was 49.42 +/- 3.75%. The rheumatology clinic patients were separated into noninflammatory and inflammatory disease groups. The mean ZSR values for these groups were: noninflammatory, 51.60 +/- 5.33%; inflammatory, 59.43 +/- 7.32% (t = 5.5, p less than 0.001). The correlation between ZSR and ESR values was excellent. The ZSR determination has several advantages over the standard ESR in that it can be performed on blood anticoagulated with EDTA and need not be corrected for age, sex or packed cell volume. The ZSR is a rapid, reproducible test correlating well with rheumatic disease activity.

Adult↗