Table S1.

Bond distances between side chain atoms and sugar atoms (NPG and TDG) in two different binding sites in the asymmetric unit (calculated in COOT)

Protein side-chain atom	NPG atom	Distance in chain A (Å)	Distance in chain B (Å)	TDG atom	Distance in chain A (Å)	Distance in chain B (Å)
E269 OE1	O4	2.9	3.2	O4	2.7	(3.6)
E269 OE2	O4	3.2	(3.8)	O4	3.4	(4.3)
E269 OE2	O3	2.8	2.8	O3	3.1	(4.3)
R144 NH1	O6	3.0	2.8	O6	2.5	2.6
R144 NH2	O6	(3.7)	3.0	O6	(4.1)	3.5
R144 NH2	E126 OE2	3.2	3.5	E126 OE2	2.8	2.8
R144 NH2	O5	(3.6)	3.0	O5	(4.1)	3.2
R144 NE	E126 OE2	(3.6)	3.0	E126 OE2	(3.9)	2.6
H322 NE2	O2	3.4	(3.7)	O2	(4.2)	(4.1)
H322 NE2	O3	3.1	(3.9)	O3	(3.5)	3.2
H322 ND1	E325 OE2	3.2	(3.7)	E325 OE2	3.3	3.5
H322 ND1	Y236O	3.3	3.0	Y236O	3.1	2.8
N272 ND2	O4	3.3	2.9	O4	3.1	3.2
F27 CE2	C11	(4.0)	(3.6)	C6′	(3.8)	(3.7)
M23 SD	C10	3.5	(4.3)	C5′	(4.5)	(5.4)
C148 SG	O4	(3.9)	3.1	O4	(4.6)	(5.2)
C148 SG	O6	3.1	3.2	O6	(4.1)	(4.3)

Bold numbers indicate distances that are longer than hydrogen bonding.