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Target identification of PAB

ABSTRACT: Identification of cellular targets of PAB and functional studies

INSTRUMENT(S): Q Exactive

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Yiqing Zhou

LAB HEAD: Yiqing Zhou

PROVIDER: PXD006423 | Pride | 2022-02-28

REPOSITORIES: Pride

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Project description:Prenylation consists of the modification of proteins with either farnesyl diphosphate (FPP) or geranylgeranyl diphosphate (GGPP) at a cysteine near the C-terminus of target proteins to generate thioether-linked lipidated proteins. Given the widespread involvement of prenylation in protein localization, membrane trafficking, and cellular signaling, dysregulation of prenylation and prenylated proteins have been implicated in the pathogenesis of numerous diseases. In recent work, metabolic labeling with alkyne-containing isoprenoid analogues including C15AlkOPP has been used to identify prenylated proteins and track their levels in different diseases. Here, a systematic study of the impact of isoprenoid length on proteins labeled with these probes was performed. First docking experiments were used to examine how lipid length might impact prenyltransferase selectivity. Next, chemical synthesis was used to generate two new analogues, C15hAlkOPP and C20AlkOPP, bringing the total number of compounds to four used in this study. Enzyme kinetics were used to evaluate these molecules as substrates for prenyltransferases in vitro. In cellulo metabolic labeling, enrichment and proteomic analysis were performed, resulting in the labeling of 8 proteins for C10AlkOPP (lipid length = 12 atoms), 70 proteins for C15AlkOPP (lipid length = 16 atoms), 41 proteins for C15hAlkOPP (lipid length = 17 atoms) and 7 proteins for C20AlkOPP (lipid length = 20 atoms). While C10AlkOPP was the most selective for farnesylated proteins and C20AlkOPP was most selective for geranylgeranylated proteins, the number of proteins identified using those probes was relatively small. In contrast, C15AlkOPP labeled the most proteins including representatives from all classes of prenylated proteins. Functional analysis of these analogues demonstrated that C15AlkOPP was particularly well suited for biological studies since it was efficiently incorporated in cellulo, was able to confer correct plasma membrane localization of H-Ras protein and complement the effects of GGPP depletion in macrophages to yield correct cell polarization and filopodia. Collectively, these results indicate that C15AlkOPP is a biologically functional, universal probe for metabolic labeling experiments that has minimal effects on cellular physiology.

			Action	DRS
	PAB-Daynebindingsite.pdResult	Other
	PAB-Daynebindingsite.raw	Raw
	PAB_HeLa_1st.pdResult	Other
	PAB_HeLa_1st.raw	Raw
	PAB_HeLa_2nd.pdResult	Other

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Target identification of PAB

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