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UDP-Araf is generated from UDP-L-arabinopyranose (UDP-Arap) by a UDP-Arap mutase (UAM) on the cytosolic face of the Golgi and then imported into the Golgi lumen for utilization by arabinosyltransferases (AraTs). Yet, a substantial fraction of UDP-Arap is synthesized in the Golgi lumen by the UDP-xylose 4-epimerase (UXE), creating a topological paradox where luminal UDP-Arap must be exported to the cytosol for conversion to UDP-Araf by UAM and then re-imported into the Golgi lumen. To test the functional significance of this compartmentation, we mislocalized Arabidopsis (Arabidopsis thaliana) UAM1 to the Golgi lumen by fusing it to the UXE1 transmembrane domain. The fusion protein was present in the Golgi, and protease-protection assays on microsomes supported its luminal orientation. In wild-type and uam1 plants, Golgi-targeted UAM1 reduced total cell wall Arabinose without consistent changes in other monosaccharides. Linkage analyses showed that this decrease reflects selective loss of Araf residues, whereas Arap remain largely unchanged, consistent with reduced UDP-Araf availability for luminal AraTs. Under salt stress, expression of Golgi-targeted UAM1 in uam1 caused root-growth inhibition and maturation-zone swelling that exogenous L-Ara failed to rescue. These results support a hypothesis that the strong thermodynamic bias of the UAM reaction toward UDP-Arap requires spatial separation of UDP-Arap production from UDP-Araf formation to sustain UDP-Araf flux into Golgi arabinosylation and avoid futile intraluminal back-conversion.<\/jats:p>","DOI":"10.1093\/plcell\/koag154","type":"journal-article","created":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T11:42:43Z","timestamp":1779968563000},"source":"Crossref","is-referenced-by-count":0,"title":["Compartmental control of UDP-Ara\n                    <i>f<\/i>\n                    supply: Golgi lumen UDP-Arabinopyranose mutase depletes plant cell wall Ara\n                    <i>f<\/i>\n                    linkages"],"prefix":"10.1093","volume":"38","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3415-9381","authenticated-orcid":false,"given":"Asier","family":"Largo-Gosens","sequence":"first","affiliation":[{"name":"Centro de Biotecnolog\u00eda Vegetal, Facultad de Ciencias de la 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Biotecnolog\u00eda Vegetal, Facultad de Ciencias de la Vida, Universidad Andr\u00e9s Bello , Santiago ,","place":["Chile"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7983-0271","authenticated-orcid":false,"given":"Rachel A","family":"Mertz","sequence":"additional","affiliation":[{"name":"Department of Botany and Plant Pathology, Purdue University , 915 Mitch Daniels Blvd, West Lafayette, IN 47907, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher K","family":"Dugard","sequence":"additional","affiliation":[{"name":"Department of Botany and Plant Pathology, Purdue University , 915 Mitch Daniels Blvd, West Lafayette, IN 47907, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nicholas C","family":"Carpita","sequence":"additional","affiliation":[{"name":"Renewable Resources and Enabling Sciences Center, BioEconomy & Sustainable Transportation Directorate, National Renewable Energy 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