Daniel Isidoro Suarez, through counsel, appeals the district court’s denial of his pro se motion for a reduced sentence, which was filed pursuant to 18 U.S.C. § 3582(c)(2), and the denial of his motion for reconsideration. Suarez’s § 3582(c)(2) motion was based on Amendment 706 to the sentencing guidelines, which reduced the base offense levels applicable to certain crack cocaine offenses. On appeal, Suarez argues that he was eligible for a sentence reduction because even though he was sentenced a career offender, the controlling precedent, United States v. Moore, 541 F.3d 1323 (11th Cir. 2008), cert. denied - U.S. -, 129 S.Ct. 965, 173 L.Ed.2d 156 (2009), was wrongly decided. Specifically, he maintains that Moore is wrong because, under United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 *552 L.Ed.2d 621 (2005), and its progeny, the guidelines are not mandatory, and the district court has the discretion to consider that the Sentencing Commission has now retroactively lowered by two levels the crack offense guidelines. Suarez also contends that the district court possesses the discretion after considering the § 3553(a) factors, in conjunction with Booker and Kimbrough v. United States, 552 U.S. 85, 128 S.Ct. 558, 169 L.Ed.2d 481 (2007), to give him the benefit of the retroactive amendments to the crack offense guidelines.

“We review de novo a district court’s conclusions about the scope of its legal authority under 18 U.S.C. § 3582(c)(2).” United States v. James, 548 F.3d 983, 984 (11th Cir. 2008). A district court may modify a term of imprisonment in the case of a defendant who was sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission. 18 U.S.C. § 3582(c)(2). Amendment 706, which has been made retroactive, amended the drug quantity table in § 2Dl.l(c) “to provide a two-level reduction in base offense levels for crack cocaine offenses.” Moore, 541 F.3d at 1325. However, if a defendant is a career offender, his base offense level is determined under the career offender guideline in § 4Bl.l(b) and not the drug quantity guideline in § 2Dl.l(c). Id. at 1327-28. Defendants who are sentenced under the career offender guideline are not sentenced under § 2D1.1, and therefore Amendment 706 has no effect on their applicable guideline range. Id. Additionally, we have deemed Booker and Kim-brough inapplicable to § 3582(c)(2) proceedings. United States v. Melvin, 556 F.3d 1190, 1192-93 (11th Cir. 2009) (per curiam), cert. denied — U.S. -, 129 S.Ct. 2382, 173 L.Ed.2d 1300 (2009). We are bound to follow our prior binding precedent “unless and until it is overruled by this [Cjourt en bane or by the Supreme Court.” United States v. Vega-Castillo, 540 F.3d 1235, 1236 (11th Cir. 2008), cert. denied (No. 08-8655) (U.S. May 18, 2009).

Because Suarez was sentenced as a career offender under § 4B1.1, the crack cocaine base offense level played no ultimate role in his sentence, and therefore, the district court correctly determined that he was not eligible for a § 3582(c)(2) sentence reduction. Accordingly, we affirm.

AFFIRMED. 1