TY  - JOUR
A1  - Park, Misoon
A1  - Krause, Cornelia
A1  - Karnahl, Matthias
A1  - Reichardt, Ilka
A1  - El Kasmi, Farid
A1  - Mayer, Ulrike
A1  - Stierhof, York-Dieter
A1  - Hiller, Ulrike
A1  - Strompen, Georg
A1  - Bayer, Martin
A1  - Kientz, Marika
A1  - Sato, Masa H.
A1  - Nishimura, Marc T.
A1  - Dangl, Jeffery L.
A1  - Sanderfoot, Anton A.
A1  - Jürgens, Gerd
T1  - Concerted Action of Evolutionarily Ancient and Novel SNARE Complexes in Flowering-Plant Cytokinesis
JF  - Developmental cell
N2  - Membrane vesicles delivered to the cell-division plane fuse with one another to form the partitioning membrane during plant cytokinesis, starting in the cell center. In Arabidopsis, this requires SNARE complexes involving the cytokinesis-specific Qa-SNARE KNOLLE. However, cytokinesis still occurs in knolle mutant embryos, suggesting contributions from KNOLLE-independent SNARE complexes. Here we show that Qa-SNARE SYP132, having counterparts in lower plants, functionally overlaps with the flowering plant-specific KNOLLE. SYP132 mutation causes cytokinesis defects, knolle syp132 double mutants consist of only one or a few multi-nucleate cells, and SYP132 has the same SNARE partners as KNOLLE. SYP132 and KNOLLE also have non-overlapping functions in secretion and in cellularization of the embryo-nourishing endosperm resulting from double fertilization unique to flowering plants. Evolutionarily ancient non-specialized SNARE complexes originating in algae were thus amended by the appearance of cytokinesis-specific SNARE complexes, meeting the high demand for membrane-fusion capacity during endosperm cellularization in angiosperms.
Y1  - 2018
U6  - https://doi.org/10.1016/j.devcel.2017.12.027
SN  - 1534-5807
SN  - 1878-1551
VL  - 44
IS  - 4
SP  - 500
EP  - +
PB  - Cell Press
CY  - Cambridge
ER  - 
TY  - JOUR
A1  - York, T.
A1  - Jackson, N.
A1  - Browne, Ian W. A.
A1  - Wucknitz, Olaf
A1  - Skelton, J. E.
T1  - The Hubble constant from the gravitational lens CLASS B0218+357 using the Advanced Camera for Surveys
N2  - We present deep optical observations of the gravitational lens system CLASS B0218 + 357, from which we derive an estimate for the Hubble constant (H-0). Extensive radio observations using the VLA, MERLIN, the VLBA and VLBI have reduced the degeneracies between H-0 and the mass model parameters in this lens to one involving only the position of the radio-quiet lensing galaxy with respect to the lensed images. B0218 + 357 has an image separation of only 334 mas, so optical observations have, up until now, been unable to resolve the lens galaxy from the bright lensed images. Using the new Advanced Camera for Surveys (ACS), installed on the Hubble Space Telescope in 2002, we have obtained deep optical images of the lens system and surrounding field. These observations have allowed us to determine the separation between the lens galaxy centre and the brightest image, and so estimate H-0. We find an optical galaxy position, and hence an H0 value, that varies depending on our approach to the spiral arms in B0218 + 357. If the most prominent spiral arms are left unmasked, we find H-0 = 70 +/- 5 km s(-1) Mpc(-1) (95 per cent confidence). If the spiral arms are masked out, we find H-0 = 61 +/- 7 km s(-1) Mpc(-1) (95 per cent confidence)
Y1  - 2005
SN  - 0035-8711
ER  -