cystinosin, mpdu1, sweets and kdelr belong to a well-defined protein family with putative function of cargo receptors involved in vesicle traffickingcystinosin mpdu1,糖果和kdelr属于一个定义良好的蛋白质与假定的家庭功能的货物受体参与囊泡贩运.pdfVIP

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cystinosin, mpdu1, sweets and kdelr belong to a well-defined protein family with putative function of cargo receptors involved in vesicle traffickingcystinosin mpdu1,糖果和kdelr属于一个定义良好的蛋白质与假定的家庭功能的货物受体参与囊泡贩运.pdf

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cystinosin, mpdu1, sweets and kdelr belong to a well-defined protein family with putative function of cargo receptors involved in vesicle traffickingcystinosin mpdu1,糖果和kdelr属于一个定义良好的蛋白质与假定的家庭功能的货物受体参与囊泡贩运

Cystinosin, MPDU1, SWEETs and KDELR Belong to a Well- Defined Protein Family with Putative Function of Cargo Receptors Involved in Vesicle Trafficking Vladimir Saudek* University of Cambridge Metabolic Research Labs, Institute of Metabolic Science, Addenbrooke’s Hospital, Cambridge, United Kingdom Abstract Classification of proteins into families based on remote homology often helps prediction of their biological function. Here we describe prediction of protein cargo receptors involved in vesicle formation and protein trafficking. Hidden Markov model profile-to-profile searches in protein databases using endoplasmic reticulum lumen protein retaining receptors (KDEL, Erd2) as query reveal a large and diverse family of proteins with seven transmembrane helices and common topology and, most likely, similar function. Their coding genes exist in all eukaryota and in several prokaryota. Some are responsible for metabolic diseases (cystinosis, congenital disorder of glycosylation), others are candidate genes for genetic disorders (cleft lip and palate, certain forms of cancer) or solute uptake and efflux (SWEETs) and many have not yet been assigned a function. Comparison with the properties of KDEL receptors suggests that the family members could be involved in protein trafficking and serve as cargo receptors. This prediction sheds new light on a range of biologically, medically and agronomically important proteins and could open the way to discovering the function of many genes not yet annotated. Experimental testing is suggested. Citation: Saudek V (2012) Cystinosin, MPDU1, SWEETs and KDELR Belong to a Well-Defined Protein Family with Putative Function of Cargo Receptors Involved in Vesicle Trafficking. PLoS ONE 7(2): e30876. doi:10.1371/journal.pone.0030876 Editor: Franca Fraternali, Kings College, London, United Kingdom