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. 1976 Feb 1;153(2):423–428. doi: 10.1042/bj1530423

The association of yeast phosphoglycerate kinase (EC 2.7.2.3).

S P Spragg, J K Wilcox, J J Roche, W A Barnett
PMCID: PMC1172589  PMID: 776174

Abstract

1. A mol.wt. of 40030 +/- 830 has been estimated for phosphoglycerate kinase in concentrations less than 0.1 g/100 cm3 comparing favourably with expected values from X-ray diffraction measurements by 10% lower than the previously reported molecular weights made at higher concentrations. 2. The so20w, was estimated to be 3.12(+/-0.02)x10(-13)s and the coefficient had a low concentration dependency giving a g value (concentration-dependency) of 2.3 +/- 1.6cm3 .g-1. This agrees with previous qualitative observations. 3. By using fluctuation-intensity spectroscopy, the D20,w was estimated to be 7.4(+/-0.2)x10(-11)m2.s-1, and this was indistinguishable from the D20,w calculated from ultracentrifuge results. The water of hydration was estimated to be 0.46 g/g of protein. 4. It is inferred from the estimates that phosphoglycerate kinase associates with an interaction coefficient at 20 degrees C for monomer/dimer of between 10 and 12 cm3.g-1. 5. The ratio of molecular asymmetry (a/b) was estimated to be 2.5+/-0.2 from the values of D20,w and water of hydration. This compares favourably with the ratio from the overall dimensions estimated from X-ray diffraction measurements.

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Selected References

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