Chemical Synthesis of Secretoglobin 3A2 Covalent Homodimer and Photocaged Monomeric Variants

Secretoglobin (SCGB) 3A2 belongs to an intriguing family of small, secreted proteins present only in mammals. Although members of the SCGB protein family have distinct amino acid sequences, they share structural similarities. Of particularly interest is the not yet fully understood self‐assembly abi...

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Bibliographic Details
Published in:Angewandte Chemie 2024-06, Vol.136 (26), p.n/a
Main Authors: Gazzi, Thais, Heinke, Maria, Landolt, Fabienne, Bode, Jeffrey W.
Format: Article
Language:English
Subjects:
Amino acids
chemical protein synthesis
Chemical synthesis
Covalence
Dimerization
KAHA ligation
Oligomerization
protein modification
Proteins
Residues
SCGB3A2
Self-assembly
Structural behavior
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Summary:Secretoglobin (SCGB) 3A2 belongs to an intriguing family of small, secreted proteins present only in mammals. Although members of the SCGB protein family have distinct amino acid sequences, they share structural similarities. Of particularly interest is the not yet fully understood self‐assembly ability of SCGBs, which arise from covalent disulfide dimerization and non‐covalent oligomerization. Recently, SCGB3A2 has attracted attention for its singular expression profile in airways. However, the knowledge on SCGB3A2 (patho)physiology derives exclusively from in vivo and complex ex vivo mixtures, which hampers characterization of the mechanisms driving SCGB3A2 structural behavior. Herein, we document the chemical synthesis of SCGB3A2 in multi‐milligram quantities. Key to access both monomeric and homodimeric SCGB3A2 analogues was the use of KAHA ligation and enabled masking of the cysteine residue. The synthetic proteins were used to investigate the SCGB3A2 self‐assembly profile, confirming their high propensity to dimerization even in the absence of the key Cys residue. Secretoglobin (SCGB) 3A2 is a small, secreted protein present only in mammals. Despite its unique self‐assembly driven by disulfide dimerization and non‐covalent oligomerization, current understanding of its physiology relies solely on in vivo and complex ex vivo mixtures. SCGB3A2 chemical synthesis using KAHA ligation now enables access to monomeric and homodimeric SCGB3A2 analogues for studying its self‐assembly behavior.
ISSN:0044-8249
1521-3757
DOI:10.1002/ange.202404992