REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA

BISACCIA F, DEPALMA A, Dierks T, KRAMER R, PALMIERI F (1993)
BIOCHIMICA ET BIOPHYSICA ACTA 1142(1-2): 139-145.

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Zeitschriftenaufsatz | Veröffentlicht | Englisch
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Abstract / Bemerkung
Transport of citrate and malate by the tricarboxylate carrier from rat liver mitochondria has been studied in a reconstituted system. Homologous citrate/citrate antiport and heterologous (electroneutral) citrate/malate antiport was kinetically analyzed. The maximal rates of the two exchange modes did not vary significantly within pH 7.0 to 7.8 which is the optimum pH-range for transport activity. On the other hand, the apparent transport affinity varied considerably within this range. Calculations on the basis of the different pK values for citrate and malate indicate that only H-citrate 2 -and malate 2 -are accepted as transport species by the tricarboxylate carrier. A complete set of half-saturation constants was established for citrate and malate on both the external and the internal side of the membrane. Both the K(m) and V(max) for citrate and malate were independent of the nature of the countersubstrate at the other side of the membrane. Bisubstrate initial velocity analyses of the exchange reaction resulted in a kinetic pattern which is consistent with a sequential antiport mechanism. This type of mechanism implies formation of a ternary complex of the carrier with two substrate molecules before the transport reaction occurs. Thus the tricarboxylate carrier falls into the functional family of mitochondrial carrier proteins showing sequential transport mechanisms.
Erscheinungsjahr
Zeitschriftentitel
BIOCHIMICA ET BIOPHYSICA ACTA
Band
1142
Zeitschriftennummer
1-2
Seite
139-145
ISSN
PUB-ID

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BISACCIA F, DEPALMA A, Dierks T, KRAMER R, PALMIERI F. REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA. BIOCHIMICA ET BIOPHYSICA ACTA. 1993;1142(1-2):139-145.
BISACCIA, F., DEPALMA, A., Dierks, T., KRAMER, R., & PALMIERI, F. (1993). REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA. BIOCHIMICA ET BIOPHYSICA ACTA, 1142(1-2), 139-145. doi:10.1016/0005-2728(93)90095-W
BISACCIA, F., DEPALMA, A., Dierks, T., KRAMER, R., and PALMIERI, F. (1993). REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA. BIOCHIMICA ET BIOPHYSICA ACTA 1142, 139-145.
BISACCIA, F., et al., 1993. REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA. BIOCHIMICA ET BIOPHYSICA ACTA, 1142(1-2), p 139-145.
F. BISACCIA, et al., “REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA”, BIOCHIMICA ET BIOPHYSICA ACTA, vol. 1142, 1993, pp. 139-145.
BISACCIA, F., DEPALMA, A., Dierks, T., KRAMER, R., PALMIERI, F.: REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA. BIOCHIMICA ET BIOPHYSICA ACTA. 1142, 139-145 (1993).
BISACCIA, F, DEPALMA, A, Dierks, Thomas, KRAMER, R, and PALMIERI, F. “REACTION-MECHANISM OF THE RECONSTITUTED TRICARBOXYLATE CARRIER FROM RAT-LIVER MITOCHONDRIA”. BIOCHIMICA ET BIOPHYSICA ACTA 1142.1-2 (1993): 139-145.

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