Molecular Weight vs. Method
in the Protein Data Bank
April 2007 by Eric Martz for Protein Explorer.

Method	Contributor	Median Molecular Weight	90% < MW 1
X-Ray 85% of PDB	Not Structural Genomics 1972-present	44,500 (~401 amino acids)	145,000
	Structural Genomics 97% 2002-present	47,000 (~423 amino acids)	130,000
NMR 15% of PDB	Not Structural Genomics 1989-present	8,600 (~77 amino acids)	19,000
	Structural Genomics 99% 2002-present	11,250 (~101 amino acids)	16,000

1. 90% of entries have a molecular weight less than shown.
 

Protein	Molecular Weight	Amino Acids
Insulin	5,800	51
Lysozyme	15,000	130
Green Fluorescent Protein	27,000	236
Serum Albumin	66,600	536
Taq DNA Polymerase	94,000	832
Antibody	150,000	1,350 (4 chains)
Chaperonin GROEL/S	875,000	~7,900 (21 chains)

See also:

• Molecular Weight vs. Method in the Protein Data Bank
• Early and Recent Redundancy & Molecular Weight in the Protein Data Bank