Macromolecule Content

• Total Structure Weight: 19.02 kDa 
• Atom Count: 1109 
• Residue Count: 138 
• Unique protein chains: 2

2AFF

The solution structure of the Ki67FHA/hNIFK(226-269)3P complex

• DOI: 10.2210/pdb2AFF/pdb
• BMRB: 6748

• Classification: CELL CYCLE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2005-07-25 Released: 2005-10-25 
• Deposition Author(s): Byeon, I.-J.L., Li, H., Song, H., Gronenborn, A.M., Tsai, M.D.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 512 
• Conformers Submitted: 100 
• Selection Criteria: structures with the least restraint violations,structures with the lowest energy 

Literature

Sequential phosphorylation and multisite interactions characterize specific target recognition by the FHA domain of Ki67.

Byeon, I.J., Li, H., Song, H., Gronenborn, A.M., Tsai, M.D.

(2005) Nat Struct Mol Biol 12: 987-993

• PubMed: 16244663 
• DOI: 10.1038/nsmb1008
• Primary Citation of Related Structures:  
  2AFF


• PubMed Abstract: 
  

The forkhead-associated (FHA) domain of human Ki67 interacts with the human nucleolar protein hNIFK, recognizing a 44-residue fragment, hNIFK226-269, phosphorylated at Thr234. Here we show that high-affinity binding requires sequential phosphorylation by two kinases, CDK1 and GSK3, yielding pThr238, pThr234 and pSer230. We have determined the solution structure of Ki67FHA in complex with the triply phosphorylated peptide hNIFK226-269(3P), revealing not only local recognition of pThr234 but also the extension of the beta-sheet of the FHA domain by the addition of a beta-strand of hNIFK. The structure of an FHA domain in complex with a biologically relevant binding partner provides insights into ligand specificity and potentially links the cancer marker protein Ki67 to a signaling pathway associated with cell fate specification.

---

Related Citations: 

• Structure of human Ki67 FHA domain and its binding to a phosphoprotein fragment from hNIFK reveal unique recognition sites and new views to the structural basis of FHA domain functions.
  Li, H., Byeon, I.-J.L., Ju, Y., Tsai, M.-D.
  (2004) J Mol Biol 335: 371

---

Organizational Affiliation: 

Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, US National Institutes of Health (NIH), Bethesda, Maryland 20892, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Antigen KI-67	A	120	Homo sapiens	Mutation(s): 0  Gene Names: MKI67
Find proteins for P46013 (Homo sapiens) Explore P46013  Go to UniProtKB:  P46013
NIH Common Fund Data Resources
PHAROS  P46013 GTEx  ENSG00000148773

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
MKI67 FHA domain interacting nucleolar phosphoprotein	B	44	Homo sapiens	Mutation(s): 0  Gene Names: MKI67IP, NIFK, NOPP34
Find proteins for Q9BYG3 (Homo sapiens) Explore Q9BYG3  Go to UniProtKB:  Q9BYG3
NIH Common Fund Data Resources
PHAROS  Q9BYG3 GTEx  ENSG00000155438

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	B	L-PEPTIDE LINKING	C3 H8 N O6 P		SER
TPO	B	L-PEPTIDE LINKING	C4 H10 N O6 P		THR

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 512 
• Conformers Submitted: 100 
• Selection Criteria: structures with the least restraint violations,structures with the lowest energy 
• OLDERADO: 2AFF Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2005-07-25 
• Released Date: 2005-10-25 
Deposition Author(s): Byeon, I.-J.L., Li, H., Song, H., Gronenborn, A.M., Tsai, M.D.

Revision History 

• Version 1.0: 2005-10-25
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance