Structural basis for recruitment of Ubc12 by an E2 binding domain in NEDD8's E1.
E2 conjugating enzymes play a central role in ubiquitin and ubiquitin-like protein (ublp) transfer cascades: the E2 accepts the ublp from the E1 enzyme and then the E2 often interacts with an E3 enzyme to promote ublp transfer to the target. We report here the crystal structure of a complex between the C-terminal domain from NEDD8's heterodimeric E1 (APPBP1-UBA3) and the catalytic core domain of NEDD8's E2 (Ubc12). The structure and associated mutational analyses reveal molecular details of Ubc12 recruitment by NEDD8's E1. Interestingly, the E1's Ubc12 binding domain resembles ubiquitin and recruits Ubc12 in a manner mimicking ubiquitin's interactions with ubiquitin binding domains. Structural comparison with E2-E3 complexes indicates that the E1 and E3 binding sites on Ubc12 may overlap and raises the possibility that crosstalk between E1 and E3 interacting with an E2 could influence the specificity and processivity of ublp transfer.
Huang
Danny T
DT
Department of Structural Biology, Department of Genetics/Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
Paydar
Amir
A
Zhuang
Min
M
Waddell
M Brett
MB
Holton
James M
JM
Schulman
Brenda A
BA
D000595:Amino Acid Sequence; D001665:Binding Sites; D018360:Crystallography, X-Ray; D006801:Humans; D066298:In Vitro Techniques; D008958:Models, Molecular; D008969:Molecular Sequence Data; D015394:Molecular Structure; D046912:Multiprotein Complexes; D009154:Mutation; D000075687:NEDD8 Protein; D017434:Protein Structure, Tertiary; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D044764:Ubiquitin-Activating Enzymes; D044763:Ubiquitin-Conjugating Enzymes / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D014452:Ubiquitins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*
D046912:Multiprotein Complexes; D000075687:NEDD8 Protein; C082860:NEDD8 protein, human; D011994:Recombinant Proteins; D014452:Ubiquitins; D044763:Ubiquitin-Conjugating Enzymes; D044764:Ubiquitin-Activating Enzymes; C491802:NAE protein, human