biostudies-otherDyer JMNIGMS NIH HHS269-80https://www.ebi.ac.uk/biostudies/studies/S-EPMC2120804No targeting sequence for peroxisomal integral membrane proteins has yet been identified. We have previously shown that a region of 67 amino acids is necessary to target Pmp47, a protein that spans the membrane six times, to peroxisomes. This region comprises two membrane spans and the intervening loop. We now demonstrate that the 20 amino acid loop, which is predicted to face the matrix, is both necessary and sufficient for peroxisomal targeting. Sufficiency was demonstrated with both chloramphenicol acetyltransferase and green fluorescent protein as carriers. There is a cluster of basic amino acids in the middle of the loop that we predict protrudes from the membrane surface into the matrix by a flanking stem structure. We show that the targeting signal is composed of this basic cluster and a block of amino acids immediately down-stream from it.biostudies-otherEurope PMCUnknown133(2)The Journal of cell biologyPMC2120804GM16974T32 GM-07062GM31859Goodman JMDyer JMMcNew JAfalseThe sorting sequence of the peroxisomal integral membrane protein PMP47 is contained within a short hydrophilic loop.No targeting sequence for peroxisomal integral membrane proteins has yet been identified. We have previously shown that a region of 67 amino acids is necessary to target Pmp47, a protein that spans the membrane six times, to peroxisomes. This region comprises two membrane spans and the intervening loop. We now demonstrate that the 20 amino acid loop, which is predicted to face the matrix, is both necessary and sufficient for peroxisomal targeting. Sufficiency was demonstrated with both chloramphenicol acetyltransferase and green fluorescent protein as carriers. There is a cluster of basic amino acids in the middle of the loop that we predict protrudes from the membrane surface into the matrix by a flanking stem structure. We show that the targeting signal is composed of this basic cluster and a block of amino acids immediately down-stream from it.1996-01-01T00:00:00Z1996 Apr2019-03-27T02:22:07Z2019-03-27T02:22:07ZS-EPMC2120804R54274860916110.1083/jcb.133.2.269