And here's how to make it:
Protein Monomers (Make 4)
Ch 203
Slip stitch in 2nd chain from hook and in next 4 (5 slip stitch)
Ch 3, 2 dc in same ch (3 dc in each ch) x7 (8 with 3 dc in each)
Slip stitch in 8 ch (8 slip stitch)
Ch 3, 2 dc in same ch (3 dc in each ch) x23 (24 with 3 dc in each)
Slip stitch in 4 ch (4 slip stitch)
Ch 3, 2 dc in same ch (3 dc in each ch) x35 (36 with 3 dc in each)
Slip stitch in 16 ch (16 slip stitch)
Ch 3, 2 dc in same ch (3 dc in each ch) x23 (24 with 3 dc in each)
Slip stitch in 20 ch (20 slip stitch)
Ch 3, 2 dc in same ch (3 dc in each ch) x52 (51 with 3 dc in each)
Slip stitch in remaining 5 ch (5 slip stitch)
I used five flower arranging cylinders (3 7/8 inches tall each) stacked together, held together by skewers and attached to a piece of round styrofoam to form the base.
To have the helices retain their integrity and not be stretched out by the weight of the yarn, I threaded straws, cut to the appropriate length through the helices. Then I ran a bit of yarn through them and tied the yarn very very tightly to the end of the helices. This makes the helices stay on the straw and not stretch.
I then stuck a skewer through the straw of the last (longest) helix. Halfway through, I pushed the skewer through the side of the straw and pushed it into the support column.
I then ran skewers through the column at the top and about a third of the way up, and then draped the strands on this scaffolding as shown in the actual protein structure at the website shown below.
http://www.pdb.org/pdb/101/motm_disscussed_entry.do?id=1f6g
Protein is 1F6G in the protein data bank.