What is the size, charge and isoelectric point of the DHFR protein in the pQE vectors?

The native Dihydrofolate Reductase (DHFR) protein has the following technical features:

• Molecular Weight: 21.5 kDa
• Isoelectric Point: 8.5
• Charge at pH 7.0: 2.2

DHFR expressed in QIAexpress vectors pQE-16 and pOE-40 has the following technical features:

pQE-16

• Molecular Weight: 23.1 kDa
• Isoelectric Point: 9.1
• Charge at pH 7.0: 5.2

pQE-40

• Molecular Weight: 24.5 kDa
• Isoelectric Point: 9.2
• Charge at pH 7.0: 7.2