2000
DOI: 10.1128/mcb.20.12.4381-4392.2000
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The CaaX Proteases, Afc1p and Rce1p, Have Overlapping but Distinct Substrate Specificities

Abstract: Many proteins that contain a carboxyl-terminal CaaX sequence motif, including Ras and yeast a-factor, undergo a series of sequential posttranslational processing steps. Following the initial prenylation of the cysteine, the three C-terminal amino acids are proteolytically removed, and the newly formed prenylcysteine is carboxymethylated. The specific amino acids that comprise the CaaX sequence influence whether the protein can be prenylated and proteolyzed. In this study, we evaluated processing of a-factor va… Show more

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Cited by 94 publications
(133 citation statements)
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“…In Saccharomyces cerevisiae, STE24 (AFC1) and RCE1 act redundantly in processing the a-factor. Only RCE1, however, is responsible for processing RAS2, whereas the only known substrate of STE24 (AFC1) is the a-factor (9,17). Fibroblasts isolated from rce1 Ϫ/Ϫ knockout mice were unable to process Ras proteins (18), whereas fibroblasts isolated from zmpste24 Ϫ/Ϫ knockout mice were able to process both Ras and other proteins (19).…”
mentioning
confidence: 88%
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“…In Saccharomyces cerevisiae, STE24 (AFC1) and RCE1 act redundantly in processing the a-factor. Only RCE1, however, is responsible for processing RAS2, whereas the only known substrate of STE24 (AFC1) is the a-factor (9,17). Fibroblasts isolated from rce1 Ϫ/Ϫ knockout mice were unable to process Ras proteins (18), whereas fibroblasts isolated from zmpste24 Ϫ/Ϫ knockout mice were able to process both Ras and other proteins (19).…”
mentioning
confidence: 88%
“…Growth Arrest Pheromone Diffusion (Halo) Assays-The assays were carried out essentially as described previously (17) with the following modifications. Three l of MATa cell slurry (ϳ10 7 cells) were spotted onto a solid, rich medium (YPD) plate containing 0.01% Triton X-100 that had been spread with a lawn (ϳ2 ϫ 10 6 cells) of the MAT␣ sst2 cells (JRY3443).…”
Section: Methodsmentioning
confidence: 99%
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“…Although functionally redundant for the endoproteolysis of the yeast a-factor CaaX motif, Rce1p and Ste24p have distinct, albeit overlapping, substrate specificities when tested in vivo against a panel of CaaX motifs 23 . Notably, the processing of Ras and most other CaaX proteins is solely dependent on Rce1p; a-factor is the only known physiological exception, though more may exist.…”
Section: Enzymatic Processing Of Prenylated Proteinsmentioning
confidence: 99%
“…Haploid MATa yeast lacking both RCE1 and STE24 (ste24⌬rce1⌬) grew normally but were unable to produce mature a-factor and therefore were sterile (5). Interestingly, Rce1p and Ste24p exhibited subtle differences in substrate specificities (5)(6)(7). Both proteins were capable of cleaving the carboxyl terminus of wild-type a-factor, which terminates in CVIA.…”
mentioning
confidence: 99%