REAGENT or RESOURCE	SOURCE	IDENTIFIER
Antibodies
mAb100	Corti et al., 2016	N/A
Chemicals, Peptides, and Recombinant Proteins
CHT type 1 resin	Bio-Rad	Cat# 158-4000
HisTrap HP 5 mL	GEHC	Cat#17524802
HiLoad Superdex 200 16/600 size-exclusion column	GEHC	Cat# 28989335
mAb Select SuRe 5 mL HiTrap	GEHC	Cat# 11003495
HiPrep 26/10 Desalting column	GEHC	Cat# 17508701
anti-hIgG (AHC) sensors	FortéBio	cat#18-1092
Sypro Orange dye	Thermo Fisher Scientific	Cat# S6650
Critical Commercial Assays
50K Amicon Ultra concentrators	Millipore	Cat# UFC905024
NativePage Bis-Tris gradient gels 4-16%	LifeTechnologies	Cat# BN1002BOX
Deposited Data
Stabilized Makona Δ-mucin GP X-ray structure	This paper	PDB: 6VKM
Experimental Models: Cell Lines
Human: Expi293F	Thermo Fischer Scientific	Cat#A14527
Software and Algorithms
FortéBio Data Analysis 8.1 software	FortéBio
CCP4i interface	Morin et al., 2013, Potterton et al., 2003	https://www.ccp4.ac.uk/ccp4i_main.php
iMOSFLM	Powell et al., 2017	https://www.mrc-lmb.cam.ac.uk/mosflm/imosflm/ver730/installation.html
AIMLESS	Evans and Murshudov, 2013	http://www.ccp4.ac.uk/dist/html/aimless.html
PHASER	McCoy et al., 2007	https://www.phenix-online.org/documentation/reference/phaser_mr.html
Coot	Emsley and Cowtan, 2004	https://www2.mrc-lmb.cam.ac.uk/personal/pemsley/coot/
PHENIX	Adams et al., 2002
Astra 7.3 software package		https://www.wyatt.com/products/software/astra.html
Chromeleon 7.2.8.0 software package		https://www.thermofisher.com/order/catalog/product/CHROMELEON7