2CAV

CANAVALIN FROM JACK BEAN

Summary for 2CAV

• Entry DOI: 10.2210/pdb2cav/pdb
• Related: 2CAU
• Descriptor: PROTEIN (CANAVALIN) (2 entities in total)
• Functional Keywords: vicilin, 7s seed protein, domain duplication, swiss roll, plant protein
• Biological source: Canavalia ensiformis (jack bean)
• Total number of polymer chains: 1
• Total formula weight: 50383.47

Authors

Ko, T.-P.,Day, J.,Macpherson, A. (deposition date: 1998-11-20, release date: 1998-11-25, Last modification date: 2023-12-27)

Primary citation

Ko, T.P.,Day, J.,McPherson, A.
The refined structure of canavalin from jack bean in two crystal forms at 2.1 and 2.0 A resolution.
Acta Crystallogr.,Sect.D, 56:411-420, 2000

PubMed Abstract: The structure of canavalin was refined to 2.1 and 2.0 A resolution in cubic and hexagonal crystals of space group P2(1)3 and P6(3), respectively. The threefold molecular symmetry is expressed in the symmetry of both crystals, where each identical subunit is an asymmetric unit. The canavalin subunit consists of two very similar domains, each comprised of a core subdomain having Swiss-roll topology with a loop subdomain that contains helices. The refined canavalin models resolved the discrepancy in amino-acid registers of the secondary-structural elements compared with phaseolin. The presence of strand Z in both domains of canavalin was confirmed and a new helix in the loop between strands A and B of each domain was observed. The models were analyzed in terms of the duplicated vicilin domains. Three strictly conserved residues, two glycines and a proline, were identified. The similarity between entire vicilin molecules is greater than that between separate domains of canavalin and phaseolin. Homology modeling of the sucrose-binding protein (SBP) from soybean showed a plausible trimeric assembly of subunits similar to that of vicilins.

PubMed: 10739914
DOI: 10.1107/S0907444900002237

Experimental method

X-RAY DIFFRACTION (2 Å)