Pasteurella damsela α2-6 Sialyltransferase

Abbreviation 

Pd26ST

Source

Pasteurella damsela

Activity

Transfer Sia via an α2-6 linkage

Expression

&

Purification

Expression system:    pET15b with N-terminal His6-tag , E. coli BL21(DE3)

Induction condition:  0.1 mM IPTG, 37 °C, 3 h, 250 rpm, Luria LB broth

Purification

1) Suspend cells in ice-cold 40 mL Buffer-A + 0.1% Trixon X100

2) Disrupt cells by a CF1 cell disruptor (Constant Systems), 20 kPsi, 4 °C

3) Centrifuge at 12000 x g, 4 °C, 30 min

4) Load supernatant to a 10 mL gravity column filled with 2 mL Ni-NTA resin (pre-equilibrated)

5) Wash with 50 mL Buffer-A, then 50 mM Buffer-B, finally elute with 10 mL Buffer-C.

6) Concentrate into 2.5 mL and change buffer to Buffer D using a PD-10 column. 

7) Store at -20 °C for up to 6 months

Buffers:   A: 20 mM Tris-HCl (pH 8.0), 300 mM NaCl, 10 mM imidazole;

                B: A + 15 mM imidazole; C: A + 250 mM imidazole. 

                D: 50 mM Tris-HCl (pH 8.0), 100 mM NaCl, 50 % Glycerol

Optimal Condition

37 °C

8.5

MgCl2

50 mM Tris-HCl (pH 8.5), 22 mM donor, 20 mM acceptor, 20 mM MgCl2, incubate at 37 °C for 30 min.

Temperature

pH

Metal ion:

Example condition:   

CMP-Neu5Ac/Neu5Gc/Kdn

Gal/GalNAc

Donor:

Acceptor:

pd26st.png
pd26st-2.png

Substrate Specificity

  • Yu, H.;  Huang, S.;  Chokhawala, H.;  Sun, M.;  Zheng, H.; Chen, X., Highly efficient chemoenzymatic synthesis of naturally occurring and non-natural alpha-2,6-linked sialosides: a P. damsela alpha-2,6-sialyltransferase with extremely flexible donor-substrate specificity. Angew Chem Int Ed Engl 2006, 45 (24), 3938-44.

References