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Table 2 Library design

From: Side chain requirements for affinity and specificity in D5, an HIV-1 antibody derived from the VH1-69 germline segment

D5 position

Contact scoreA

Amino acid distribution (frequency)B

Designed codonC

Encoded residues (coverageD)

LCDR1

 

E27

Low

E(3)/Q(13)/S(2)

Not varied

E (17%)

G28

Mid

D*(5)/G(2)/N(1)/Q(1)/S(8)/Y*(1)

RRC

D/N/G/S (88%)

Y30

Mid

G(3)/R(1)/S*(10)/Y*(2)/V(1)

NDT

C/D/F/G/H/I/N/L/R/S/V/Y (100%)

H31

Mid

H(4)/N*(5)/S(7)/T(2)

NDT

C/D/F/G/H/I/N/L/R/S/V/Y (61%)

W32

High

A(2)/D(1)/F(1)/G(1)/M(1)/N(2)/S(1)/W*(2)/Y*(6)/- (1)

NDT

C/D/F/G/H/I/N/L/R/S/V/Y (56%)

LCDR2

 

Y49

High

Y*(18)

TMT

S/Y (100%)

K50

High

A(2)/D(1)/G(5)/K*(3)/L(2)/S(2)/Y*(3)

HRC

C/H/N/R/S/Y (28%)

S52

Low

S(17)/T(1)

TMT

S/Y (94%)

S53

Mid

F*(2)/N(3)/R*(3)/S(6)/T(3)/Y(1)

HRC

C/H/N/R/S/Y (73%)

A55

Low

A(9)/F(1)/H(3)/K(1)/P(1)/Q(1)/Y(2)

Not varied

A (50%)

LCDR3

 

Y91

High

F(1)/G(3)/H(2)/R*(1)/S(3)/W*(2)/Y*(6)

HRC

C/H/N/R/S/Y (67%)

S92

High

A(1)/D*(1)/G(4)/L(1)/N*(3)/S*(4)/T(1)/W(1)/Y(2)

KMT

A/D/S/Y (44%)

N93

High

A(1)/D(1)/G(4)/H(1)/N*(5)/Q(1)/S*(1)/T(4)

RVC

A/D/G/N/S/T (89%)

Y94

Mid

L(3)/N(2)/S*(5)/T(3)/V(1)/W(2)/Y*(1)/- (1)

DMT

A/D/N/S/T/Y (61%)

P95

Mid

L(2)/P*(16)

Not varied

P (89%)

L96

High

F*(2)/I(1)/L*(1)/P(5)/R(1)/S(1)/W(4)/Y(3)

YDT

C/F/H/L/R/Y (39%)

T97

Low

R(1)/T(17)

Not varied

T (94%)

  1. A A ‘contact score’ for each position was assigned based on inspection of the antibody-antigen crystal structures in Additional file 1: Table S1. The involvement of each residue side chain was scored based on the buried surface area upon complex formation; positions that constituted a major element of the structural paratope in multiple antibodies were ranked ‘high’.
  2. B The amino acid identities and their observed frequency are listed. Residues that were heavily involved in the interaction in at least one antibody-antigen complex are indicated with an asterix. In some cases, loops lengths were shorter than D5; these are indicated by a ‘-‘at some positions.
  3. C Nucleotide degeneracies: D = A/G/T, K = G/T, H = A/C/T, M = A/C, N = A/G/C/T, R = A/G, V = A/G/C, Y = C/T.
  4. D ‘Coverage’ indicates the percentage of the naturally observed diversity that is encoded in the degenerate codon.