Table 4. Structures of HhaI MTase.

PDB	Protein	Cofactor	DNA	Reference
1hmy	WT	AdoMet	–	91
2hmy	WT	AdoMet	–	92
3mht	WT	AdoHcy	Unmethylated DNA	93
4mht	WT	AdoHcy	Fully methylated DNA	93
5mht	WT	AdoHcy	Hemimethylated DNA	94
1fjx	T250G	AdoHcy	Unmethylated DNA	90
7mht	WT	AdoHcy	G:A mismatch	47
8mht	WT	AdoHcy	G:U mismatch	47
9mht	WT	AdoHcy	G:AP mismatch	47
1mht	WT	AdoHcy	5-Fluoro-5-methyl-2′-deoxycytosine	24
6mht	WT	AdoHcy	4′-Thio-2′-deoxycytosine	95
10mh	WT	AdoHcy	5,6-Dihydro-5-azacytosine	96