Human Arginase II: Crystal Structure and Physiological Role in Male and Female Sexual Arousal

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 

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Human Arginase II: Crystal Structure and Physiological Role in Male and Female Sexual Arousal

Cama, E.Colleluori, D.M.Emig, F.A.Shin, H.Kim, S.W.Kim, N.N.Traish, A.M.Ash, D.E.Christianson, D.W.

(2003) Biochemistry 42: 8445-8451

  • DOI: https://doi.org/10.1021/bi034340j
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Arginase is a binuclear manganese metalloenzyme that catalyzes the hydrolysis of l-arginine to form l-ornithine and urea. The X-ray crystal structure of a fully active, truncated form of human arginase II complexed with a boronic acid transition state analogue inhibitor has been determined at 2.7 A resolution. This structure is consistent with the hydrolysis of l-arginine through a metal-activated hydroxide mechanism. Given that human arginase II appears to play a role in regulating l-arginine bioavailability to NO synthase in human penile corpus cavernosum smooth muscle, the inhibition of human arginase II is a potential new strategy for the treatment of erectile dysfunction [Kim, N. N., Cox, J. D., Baggio, R. F., Emig, F. A., Mistry, S., Harper, S. L., Speicher, D. W., Morris, S. M., Ash, D. E., Traish, A. M., and Christianson, D. W. (2001) Biochemistry 40, 2678-2688]. Since NO synthase is found in human clitoral corpus cavernosum and vagina, we hypothesized that human arginase II is similarly present in these tissues and functions to regulate l-arginine bioavailability to NO synthase. Accordingly, hemodynamic studies conducted with a boronic acid arginase inhibitor in vivo are summarized, suggesting that the extrahepatic arginase plays a role in both male and female sexual arousal. Therefore, arginase II is a potential target for the treatment of male and female sexual arousal disorders.

  • Organizational Affiliation

    Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Arginase II, mitochondrial precursor
A, B, C, D, E
A, B, C, D, E, F
306Homo sapiensMutation(s): 0 
Gene Names: ARG2
UniProt & NIH Common Fund Data Resources
Find proteins for P78540 (Homo sapiens)
Explore P78540 
Go to UniProtKB:  P78540
PHAROS:  P78540
GTEx:  ENSG00000081181 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP78540
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on S2C

Download Ideal Coordinates CCD File 
FA [auth D]
JA [auth E]
N [auth A]
R [auth B]
RA [auth F]
FA [auth D],
JA [auth E],
N [auth A],
R [auth B],
RA [auth F],
X [auth C]
C5 H13 B N O5 S
Query on SO4

Download Ideal Coordinates CCD File 
AA [auth D]
BA [auth D]
G [auth A]
H [auth A]
I [auth A]
AA [auth D],
BA [auth D],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
KA [auth F],
LA [auth F],
MA [auth F],
NA [auth F],
O [auth B],
S [auth C],
T [auth C],
Y [auth D],
Z [auth D]
O4 S
Query on MN

Download Ideal Coordinates CCD File 
CA [auth D]
DA [auth D]
GA [auth E]
HA [auth E]
K [auth A]
CA [auth D],
DA [auth D],
GA [auth E],
HA [auth E],
K [auth A],
L [auth A],
OA [auth F],
P [auth B],
PA [auth F],
Q [auth B],
U [auth C],
V [auth C]
Query on CL

Download Ideal Coordinates CCD File 
EA [auth D],
IA [auth E],
M [auth A],
QA [auth F],
W [auth C]
Binding Affinity Annotations 
IDSourceBinding Affinity
S2C PDBBind:  1PQ3 Ki: 30 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.227 
  • R-Value Observed: 0.227 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 142.994α = 90
b = 142.994β = 90
c = 127.328γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-08-12
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations