Table 1.

Alternative dockings of kinesin·ADP or Ncd·ADP into EM maps

Authors	State of motors bound	Heads seen	Binding orientation	Agreement with crystallographic dimer structures?	Agreement with proteolysis and mutagenesis
Sosa et al., 1997	Dimeric ncd + AMP·PNP	2	−60°	Not good, lacks 2-fold	Yes
Hoenger et al., 1998	Dimeric kinesin + AMP·PNP	1	−60°	No, 2nd head or tail would interfere   with microtubule	Yes
Kozielski et al., 1998	Dimeric kinesin + ADP	2	+90°	Yes	No
This paper	Dimeric kinesin + ADP	2	0°	Yes	Yes
This paper	Dimeric ncd + ADP	2	0°	OK, 2-fold relationship retained	Yes