7V2S

Crystal structure of juvenile hormone acid methyltransferase JHAMT isoform3 from silkworm

Summary for 7V2S

• Entry DOI: 10.2210/pdb7v2s/pdb
• Descriptor: Methyltranfer_dom domain-containing protein (2 entities in total)
• Functional Keywords: juvenile hormone, methyltransferase, insects, hormone
• Biological source: Bombyx mori (Silk moth)
• Total number of polymer chains: 2
• Total formula weight: 68376.72

Authors

Guo, P.C.,Zhang, Y.S.,Zhang, l.,Xu, H.Y. (deposition date: 2021-08-09, release date: 2022-08-10, Last modification date: 2024-11-13)

Primary citation

Zhang, L.,Xu, H.,Zhang, Y.,Zhang, H.,Wang, Z.,Guo, P.,Zhao, P.
Structural characterization and functional analysis of juvenile hormone acid methyltransferase JHAMT3 from the silkworm, Bombyx mori.
Insect Biochem.Mol.Biol., 151:103863-103863, 2022

PubMed Abstract: Juvenile hormone acid methyltransferase (JHAMT) is a rate-limiting enzyme of juvenile hormone (JH) biosynthesis in insects. It transfers the methyl group of S-adenosyl methionine to either the carboxyl group of JH acids or farnesoic acid to produce JH. Six JHAMT paralogues have been identified in the silkworm (Bombyx mori); among them, JHAMT1 and JHAMT2 display a methyltransferase activity. Here, the three-dimensional crystal structure of inactive JHAMT3 and the binary complex of JHAMT3 with its cofactor S-adenosyl-l-homocysteine were determined through X-ray crystallization. Comparative structural analysis revealed that JHAMT3 adopted a similar structural pattern to that of functional JHAMT2, which comprised one core Rossmann fold domain and one substrate-binding domain. Similar to JHAMT2, JHAMT3 underwent a conformational change at the Rossmann fold domain because of cofactor binding, which promoted ligand accommodation. However, it exhibited a relatively rigid substrate-binding pocket compared with that of JHAMT2. JHAMT3 was also highly expressed in the silk gland of fourth- and fifth-instar B. mori larvae. The results of expression profiling combined with activity analysis suggested that JHAMT3 might function as a binding protein of JH acids for the regulation of JH acid titers. These findings provide a structural basis for enhancing the understanding of the physiological function of JHAMT3 and a rational framework for the development of potent and specific inhibitors of JHAMT family members.

PubMed: 36341863
DOI: 10.1016/j.ibmb.2022.103863

Experimental method

X-RAY DIFFRACTION (2.133 Å)