TABLE 1

Subunits of the Arabidopsis 20S proteasome

Systematic nameaArabidopsisaYeastcHuman
α-Type Subunits
α1PAA1 (Prc1–At)PRS2/C7/SCL1/Y8IOTA/PROS27
PAA2
α2PAB1 (Prc3–At)PRE8/Y7C3
PAB2
α3PAC1 (Prc9–At)PRE9/Y13C9
PAC2
α4PAD1 (Prc6a)PRE6XAPC7
PAD2 (Prc6b)
α5PAE1DOA5/PUP2ZETA
PAE2 (Prcz–At)
α2PAF1 (Prc2a–At)PRE5C2/PROS30
PAF2 (Prc2b–At)
α2PAG1 (Prc8–At)PRS1/PRE10/C1C8
β-Type Subunits
β1PBA1 (Prcd–At)PRE3Y/Delta/LMP2d
β2PBB1 (Prcfa–At)PUP1Z/MECL1d
PBB2(Prcfc–At)
β3PBC1 (Prct–At)PUP3C10
PBC2
β4PBD1 (Prcgb–At)PRE1/C11C7
PBD2 (Prcga–At)
β5PBE1 (Prce–At)DOA3/PRE2/PRG1X/MB1/ε/LMP7d
β6PBF1 (Prc5–At)PRS3/PRE7/C5C5
β7PBG1 (Prch–At)PRE4N3/Beta
  • a Groll et al. (1997).

  • b Names in parentheses are the corresponding designations of the Arabidopsis 20S proteasome subunits by Paramentier et al. (1997).

  • c All yeast subunits are essental except α3/PRE9.

  • d γ-interferon inducible.