Appendix 1—table 1. The parameters of the two springs controlling extension and bending, respectively.

Parameter	Explanation	Unit
End-pausing	True or False	ND
One head fixed	True or False	ND
λ	energy factor	ND
${\lambda }_{P,AP}$	parallel to anti-parallel factor	ND
${\mathrm{\ell }}_0$	free length	$\mathrm{\mu }\mathrm{m}$
r c	capture radius	$\mathrm{\mu }\mathrm{m}$
κ	Hookean spring constant	$\mathrm{pN}{\mathrm{\mu }\mathrm{m}}^{-1}$
$F_{stall}$	stall force	$\mathrm{pN}$
$d_U$	unbound diffusivity	${\mathrm{\mu }\mathrm{m}}^2{\mathrm{s}}^{-1}$
$ϵ$	binding site density	${\mathrm{\mu }\mathrm{m}}^{-1}$
v m	max walking velocity	$\mathrm{\mu }\mathrm{m}{\mathrm{s}}^{-1}$
$K_a$	association constant ($U\rightleftharpoons S$)	${\left(\mu \mathrm{mol}/\mathrm{L}\right)}^{-1}$
$k_{o,S}$	off-rate constant ($U\rightleftharpoons S$)	${\mathrm{s}}^{-1}$
$K_{\mathrm{e}}$	effective association constant ($S\rightleftharpoons D$)	ND
$k_{o,D}$	force-independent off-rate constant ($S\rightleftharpoons D$)	${\mathrm{s}}^{-1}$
$d_S$	singly bound head diffusivity	${\mathrm{\mu }\mathrm{m}}^2{\mathrm{s}}^{-1}$
$d_D$	doubly bound head diffusivity	${\mathrm{\mu }\mathrm{m}}^2{\mathrm{s}}^{-1}$
$v_S$	singly bound walking velocity	$\mathrm{\mu }\mathrm{m}{\mathrm{s}}^{-1}$
x c	force-dependent unbinding length	$\mathrm{\mu }\mathrm{m}$