Cell Division Control in Plants

262 J.M. Seguí-Simarro et al.

Table 1

Putative components of the cell plate assembly matrix (CPAM)

Family

/Type

Structures

Candidate

Localization

Function

References

observed

molecule(s)

Plant exocyst

Y

/L-shaped

AtSec5, AtSec6, AtSec15, Golgi-derived

Vesicle tethering

(Cvrckova et al., 2001).

tethers

AtExo70, AtExo84

vesicles

Plant exocyst

Y-shaped tethers AtSec3

CPAM

Vesicle tethering

(Segu

́ı-Simarro et al., 2004).

Rab GTPases

—

???

CPAM matrix

Vesicle tethering

(Bednarek and Falbel, 2002;

and cell plate

Falbel et al., 2003).

Rops (plant

—

AtRop4, Rop1

CPAM matrix

Vesicle tethering, formation of

(Hong et al., 2001a;

Rho-GTPases)

and cell plate

short actin filaments, regulation

Molendijk et al., 2001;

of callose synthase complexes

Bednarek and Falbel, 2002).

Syntaxins

—

KNOLLE, SNAP33,

Fusing

Vesicle fusion

(Lauber et al., 1997;

NSPN11, KEULE

vesicles

Assaad et al., 2001;Zheng et al., 2002).

DRP1

Rings & springs

DRP1A,

Cell plate

Membrane squeezing,

(Gu and Verma, 1996, 1997;

phragmoplastin

intermediates

stretching and stabilization

Otegui et al., 2001;Kang et al., 2003;Segu

́ı-Simarro et al., 2004).

DRP2

Rings & springs

DRP2A

Clathrin-

Formation of recycling

(Verma, 2001;

coated buds

clathrin-coated vesicles

Konopka et al., 2006).

EB1

MT–cell

AtEB1, AtMAP65-3

CPAM-

Anchoring of MTs

(Mathur et al., 2003;

plate linkers

embedded

to the cell plate

Muller et al., 2004;

MT (+) ends

van Damme et al., 2004).

actin

Fine,

6

nm

F-actin

CPAM matrix

Multiple roles (see text)

(Endle et al., 1998;

filaments

and cell plate

Otegui et al., 2001;Bednarek and Falbel, 2002;Otegui and Staehelin, 2004).

Long coiled-

—

???

CPAM matrix

CPAM scaffold

Kang and Staehelin,

coil proteins

submitted