PMID- 10429212 OWN - NLM STAT- MEDLINE DCOM- 19990817 LR - 20191210 IS - 0014-2956 (Print) IS - 0014-2956 (Linking) VI - 263 IP - 1 DP - 1999 Jul TI - N-tail translocation in a eukaryotic polytopic membrane protein: synergy between neighboring transmembrane segments. PG - 264-9 AB - We have used the natural N-glycosylation site in the N-tail of cig30, a eukaryotic polytopic membrane protein, as a marker for N-tail translocation across the microsomal membrane. Analysis of C-terminally truncated cig30 constructs reveals that the first transmembrane segment is sufficient for translocation of the wild-type N-tail; in contrast, in a mutant with four arginines introduced into the N-tail the second transmembrane segment is also required for efficient N-tail translocation. Our observations imply a non-sequential assembly mechanism in which the ultimate location of the N-tail relative to the membrane may depend on more than one transmembrane segment. FAU - Monne, M AU - Monne M AD - Department of Biochemistry, Stockholm University, Stockholm, Sweden. FAU - Gafvelin, G AU - Gafvelin G FAU - Nilsson, R AU - Nilsson R FAU - von Heijne, G AU - von Heijne G LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Eur J Biochem JT - European journal of biochemistry JID - 0107600 RN - 0 (Membrane Proteins) RN - 0 (Recombinant Proteins) RN - EC 2.3.1.- (Acetyltransferases) RN - EC 2.3.1.- (Fatty Acid Elongases) SB - IM MH - Acetyltransferases MH - Animals MH - Binding Sites MH - Dogs MH - Fatty Acid Elongases MH - Glycosylation MH - In Vitro Techniques MH - Intracellular Membranes/metabolism MH - Membrane Proteins/*chemistry/genetics/*metabolism MH - Microsomes/metabolism MH - Mutation MH - Recombinant Proteins/chemistry/genetics/metabolism EDAT- 1999/08/03 00:00 MHDA- 1999/08/03 00:01 CRDT- 1999/08/03 00:00 PHST- 1999/08/03 00:00 [pubmed] PHST- 1999/08/03 00:01 [medline] PHST- 1999/08/03 00:00 [entrez] AID - ejb498 [pii] AID - 10.1046/j.1432-1327.1999.00498.x [doi] PST - ppublish SO - Eur J Biochem. 1999 Jul;263(1):264-9. doi: 10.1046/j.1432-1327.1999.00498.x.