PMID-sentid	Pub_year	Sent_text		comp_official_name	comp_offsetprotein_name	organism	prot_offset
21310048-3	2011	beta-TrCP is the substrate recognition domain of an E3 ubiquitin ligase complex that interacts with the di-serine motif S52/S56 in the cytoplasmic tail of Vpu to target the CD4 receptor for proteasomal degradation.	di-serine	104-113	Vpu	Human immunodeficiency virus 1	155-158	
21310048-7	2011	Our results demonstrate a strict requirement for Vpu"s di-serine motif for degradation of CD4 and also CD317, reduction of cell surface exposure of CD317, and HIV-1 release enhancement.	di-serine	55-64	Vpu	Human immunodeficiency virus 1	49-52	
21310048-11	2011	Moreover, we propose the existence of a critical, yet to be identified cellular factor that interacts with Vpu via its di-serine motif to alter the trafficking of the restriction factor.	di-serine	119-128	Vpu	Human immunodeficiency virus 1	107-110