Function
Involved in both the tricarboxylic acid (TCA) and methylcitric acid cycles (PubMed:28956599). Catalyzes the reversible isomerization of citrate to isocitrate via cis-aconitate (PubMed:3110133, PubMed:23354745). Also catalyzes the rehydration of 2-methyl-cis-aconitate to produce 2-methylisocitrate (PubMed:28956599). The apo form of AcnA functions as a RNA-binding regulatory protein which plays a role in the regulation of citrate concentration and in the sporulation. To prevent the accumulation of excessive levels of citrate, it binds near the 5' end of the citZ mRNA, decreasing its stability and thereby limiting the concentration of citrate synthase in the cell. Aconitase also binds to the gerE transcript late in sporulation and stabilizes it for translation, thereby increasing the rate and level of GerE protein accumulation (PubMed:10468622, PubMed:16923907, PubMed:23354745, PubMed:9393699).
Sequence
MANEQKTAAKDVFQARKTFTTNGKTYHYYSLKALEDSGIGKVSKLPYSIKVLLESVLRQVDGFVIKKEHVENLAKWGTAELKDIDVPFKPSRVILQDFTGVPAVVDLASLRKAMAAVGGDPDKINPEIPVDLVIDHSVQVDKAGTEDALAVNMDLEFERNAERYKFLSWAKKAFNNYQAVPPATGIVHQVNLEFLASVVHAIEEDGELVTYPDTLVGTDSHTTMINGIGVLGWGVGGIEAEAGMLGQPSYFPVPEVIGAKLVGKLPNGTTATDLALKVTQVLREKGVVGKFVEFFGPGIAELPLADRATIANMAPEYGATCGFFPVDEEALNYLRLTGRDPEHIDVVEAYCRSNGLFYTPDAEDPQFTDVVEIDLSQIEANLSGPKRPQDLIPLSAMQETFKKQLVSPAGNQGFGLNAEEENKEIKFKLLNGEETVMKTGAIAIAAITSCTNTSNPYVLIGAGLVAKKAVELGLKVPNYVKTSLAPGSKVVTGYLVNSGLLPYMKELGFNLVGYGCTTCIGNSGPLSPEIEEAVAKNDLLITSVLSGNRNFEGRIHPLVKGNYLASPPLVVAYALAGTVNINLKTDPIGVGKDGQNVYFNDIWPSMDEINALVKQTVTPELFRKEYETVFDDNKRWNEIETTDEALYKWDNDSTYIQNPPFFEEMSVEPGKVEPLKGLRVVGKFGDSVTTDHISPAGAIGKDTPAGKYLQEKGVSPRDFNSYGSRRGNHEVMMRGTFANIRIKNQIAPGTEGGFTTYWPTGEVTSIYDACMKYKEDKTGLVVLAGKDYGMGSSRDWAAKGTNLLGIRTVIAESFERIHRSNLVFMGVLPLQFKQGENADTLGLTGKEVIEVDVDETVRPRDLVTVRAINEDGNVTTFEAVVRFDSEVEIDYYRHGGILQMVLREKMKQS