Arabidopsis PIAL1 and 2 promote SUMO chain formation as E4-type SUMO ligases and are involved in stress responses and sulfur metabolism
The Plant Cell (2014) - Comment
pubmed: 25415977  doi: 10.1105/tpc.114.131300  issn: 1532-298x  issn: 1040-4651 

Konstantin Tomanov, Anja Zeschmann, Rebecca Hermkes, Karolin Eifler, Ionida Ziba, Michele Grieco, Maria Novatchkova, Kay Hofmann, Holger Hesse, Andreas Bachmair