1GQ8

Pectin methylesterase from Carrot

Summary for 1GQ8

• Entry DOI: 10.2210/pdb1gq8/pdb
• Descriptor: PECTINESTERASE, CACODYLATE ION (3 entities in total)
• Functional Keywords: hydrolase, carboxylic ester hydrolase
• Biological source: DAUCUS CAROTA (CARROT)
• Total number of polymer chains: 1
• Total formula weight: 34500.22

Authors

Johansson, K.,El-Ahmad, M.,Friemann, R.,Jornvall, H.,Markovic, O.,Eklund, H. (deposition date: 2001-11-20, release date: 2002-04-18, Last modification date: 2024-10-23)

Primary citation

Johansson, K.,El-Ahmad, M.,Friemann, R.,Jornvall, H.,Markovic, O.,Eklund, H.
Crystal Structure of Plant Pectin Methylesterase
FEBS Lett., 514:243-, 2002

PubMed Abstract: Pectin is a principal component in the primary cell wall of plants. During cell development, pectin is modified by pectin methylesterases to give different properties to the cell wall. This report describes the first crystal structure of a plant pectin methylesterase. The beta-helical structure embodies a central cleft, lined by several aromatic residues, that has been deduced to be suitable for pectin binding. The active site is found at the center of this cleft where Asp157 is suggested to act as the nucleophile, Asp136 as an acid/base and Gln113/Gln135 to form an anion hole to stabilize the transition state.

PubMed: 11943159
DOI: 10.1016/S0014-5793(02)02372-4

Experimental method

X-RAY DIFFRACTION (1.75 Å)