1PIN

PIN1 PEPTIDYL-PROLYL CIS-TRANS ISOMERASE FROM HOMO SAPIENS

• PDB DOI:  https://doi.org/10.2210/pdb1PIN/pdb

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


• Deposited: 1998-06-21 Released: 1998-10-14 
• Deposition Author(s): Noel, J.P., Ranganathan, R., Hunter, T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.266 
• R-Value Work: 0.223 
• R-Value Observed: 0.223 

Literature

Structural and functional analysis of the mitotic rotamase Pin1 suggests substrate recognition is phosphorylation dependent.

Ranganathan, R., Lu, K.P., Hunter, T., Noel, J.P.

(1997) Cell 89: 875-886

• PubMed: 9200606 
• DOI: https://doi.org/10.1016/s0092-8674(00)80273-1
• Primary Citation of Related Structures:  
  1PIN


• PubMed Abstract: 
  

  The human rotamase or peptidyl-prolyl cis-trans isomerase Pin1 is a conserved mitotic regulator essential for the G2/M transition of the eukaryotic cell cycle. We report the 1.35 A crystal structure of Pin1 complexed with an AlaPro dipeptide and the initial characterization of Pin1's functional properties. The crystallographic structure as well as pH titration studies and mutagenesis of an active site cysteine suggest a catalytic mechanism that includes general acid-base and covalent catalysis during peptide bond isomerization. Pin1 displays a preference for an acidic residue N-terminal to the isomerized proline bond due to interaction of this acidic side chain with a basic cluster. This raises the possibility of phosphorylation-mediated control of Pin1-substrate interactions in cell cycle regulation.

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Organizational Affiliation: 

Structural Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 19.08 kDa 
• Atom Count: 1,458 
• Modelled Residue Count: 153 
• Deposited Residue Count: 163 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PEPTIDYL-PROLYL CIS-TRANS ISOMERASE	A	163	Homo sapiens	Mutation(s): 0  Gene Names: PIN1 EC: 5.2.1.8
UniProt & NIH Common Fund Data Resources
Find proteins for Q13526 (Homo sapiens) Explore Q13526  Go to UniProtKB:  Q13526
PHAROS:  Q13526

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
1PG	E [auth A], F [auth A]	2-(2-{2-[2-(2-METHOXY-ETHOXY)-ETHOXY]-ETHOXY}-ETHOXY)-ETHANOL C11 H24 O6 SLNYBUIEAMRFSZ-UHFFFAOYSA-N
PRO	C [auth A]	PROLINE C5 H9 N O2 ONIBWKKTOPOVIA-BYPYZUCNSA-N
SO4	D [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ALA	B [auth A]	ALANINE C3 H7 N O2 QNAYBMKLOCPYGJ-REOHCLBHSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.266 
• R-Value Work: 0.223 
• R-Value Observed: 0.223 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 49	α = 90
b = 49	β = 90
c = 137.8	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-10-14 
Deposition Author(s): Noel, J.P., Ranganathan, R., Hunter, T.

Revision History  

• Version 1.0: 1998-10-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2013-04-24
  Changes: Other
• Version 1.4: 2014-02-26
  Changes: Other
• Version 2.0: 2023-07-26
  Type: Remediation
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Other