1.13.11.54	D101A	about 60% of wild-type activity	-, 685212	
1.13.11.54	E100A	about 2% of wild-type activity. E100 is not essential for metal binding	-, 685212	
1.13.11.54	E102A	no catalytic activity	685212	
1.13.11.54	E91A	no activity	-, 673849	
1.13.11.54	E94A	no activity	673849	
1.13.11.54	E95A	about 4% of wild-type activity	685212	
1.13.11.54	H140A	no catalytic activity	-, 685212	
1.13.11.54	H140F	no catalytic activity	685212	
1.13.11.54	H96A	no catalytic activity	-, 685212	
1.13.11.54	H98A	no catalytic activity	685212