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Table 2 Molecular weight analysis of R. capsulatus PBGS as measured by equilibrium sedimentation. Data were collected at 4°C. The column headings refer to RPM values. All results are in Da. The monomer molecular weight is 35,857 Da.

From: Rhodobacter capsulatus porphobilinogen synthase, a high activity metal ion independent hexamer

Sample 8000 10000 12000 14000 Overall
12.3 μM (.1 mM DTT) 221,698 222,291 213,584 206,743 215,700 ± 9,700
12.3 μM (1 mM βME) 227,785 230,906 224,189 205,239 220,200 ± 9,100