N-glycosylation in Spodoptera frugiperda (Lepidoptera: Noctuidae) midgut membrane-bound glycoproteins

Author(s)

Fuzita, Felipe Jun ^{[1, 2]} ; Chandler, Kevin Brown ^[1] ; Haserick, John R. ^{[1, 3]} ; Terra, Walter R. ^[2] ; Ferreira, Clelia ^[2] ; Costello, Catherine E. ^[1]

Affiliation

^[1] Boston Univ, Sch Med, Dept Biochem, Ctr Biomed Mass Spectrometry, Boston, MA 02118 - USA

^[2] Univ Sao Paulo, Dept Biochem, Lab Insect Biochem, Sao Paulo - Brazil

^[3] Glyde Bio Inc, Cambridge, MA - USA

• Document type: Journal article
• Source: COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY B-BIOCHEMISTRY & MOLECULAR BIOLOGY; v. 246-24, AUG-SEP 2020.
• Web of Science Citations: 0

Abstract

Spodoptera frugiperda is a widely distributed agricultural pest. It has previously been established that glycoproteins in the midgut microvillar membrane of insects are targets for toxins produced by different organisms as well as plant lectins. However, there is still little information about the N-glycome of membrane-bound midgut glycoproteins in Lepidoptera and other insect groups. The present study used mass spectrometry-based approaches to characterize the N-glycoproteins present in the midgut cell microvilli of Spodoptera frugiperda. We subjected midgut cell microvilli proteins to proteolytic digestion and enriched the resulting glycopeptides prior to analysis. We also performed endoglycosidase release of N-glycans in the presence of (H2O)-O-18 determining the compositions of released N-glycans by MALDI-TOF MS analysis and established the occupancy of the potential N-glycosylation sites. We report here a total of 160 glycopeptides, representing 25 N-glycan compositions associated with 70 sites on 35 glycoproteins. Glycan compositions consistent with oligomannose, paucimannose and complex/hybrid N-glycans represent 35, 30 and 35% of the observed glycans, respectively. The two most common N-glycan compositions were the complex/hybrid Hex(3)HexNAc(4)dHex(4) and the paucimannose structure that contains only the doubly-fucosylated trimannosylchitobiose core Hex(3)HexNAc(2)dHex(2), each appearing in 22 occupied sites (13.8%). These findings enlighten aspects of the glycobiology of lepidopteran midgut microvilli. (AU)

• FAPESP's process: 11/51685-8 - Insect digestion: a molecular, cellular, physiological and evolutionary approach
• Grantee: Walter Ribeiro Terra
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 16/09511-6 - Glycan structural determination of glycoproteins from the midgut of Spodoptera frugiperda
• Grantee: Felipe Jun Fuzita
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor