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In enzymology, a chloroplast protein-transporting ATPase (EC 3.6.3.52) is an enzyme that catalyzes the chemical reaction

ATP + H₂O ${\displaystyle \rightleftharpoons }$ ADP + phosphate

Thus, the two substrates of this enzyme are ATP and H₂O, whereas its two products are ADP and phosphate.

This enzyme belongs to the family of hydrolases, specifically those acting on acid anhydrides to catalyse transmembrane movement of substances. The systematic name of this enzyme class is ATP phosphohydrolase (chloroplast protein-importing).

References

• Cline K, Ettinger WF, Theg SM (1992). "Protein-specific energy requirements for protein transport across or into thylakoid membranes. Two lumenal proteins are transported in the absence of ATP". J. Biol. Chem. 267 (4): 2688–96. PMID 1733965.
• Nakai M, Goto A, Nohara T, Sugita D, Endo T (1994). "Identification of the SecA protein homolog in pea chloroplasts and its possible involvement in thylakoidal protein transport". J. Biol. Chem. 269 (50): 31338–41. PMID 7989297.
• Scott SV, Theg SM (1996). "A new chloroplast protein import intermediate reveals distinct translocation machineries in the two envelope membranes: energetics and mechanistic implications". J. Cell Biol. 132 (1–2): 63–75. doi:10.1083/jcb.132.1.63. PMC 2120703. PMID 8567731.

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