Contacts of the helix formed by residues 52 - 81 (chain H) in PDB entry 3KUY
Residue contacts within the protein are
derived with the CSU software (Sobolev V., Sorokine A.,
Prilusky J., Abola E.E. and Edelman M. (1999) Automated
analysis of interatomic contacts in proteins.
Bioinformatics, 15, 327-332). A
short description of the analytical approach
is given at the end of the page.
Note:
Non-standard 3 letter residue
codes indicate a heterogroup. To identify
and analyse, use LPC software
Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC - hydrophobic-hydrophilic contact (destabilizing contact)
+/- - indicates presence/absence of a specific contacts
* - indicates residues forming contacts by their side chain
(including CA atoms)
Residues in contact with SER 52 (chain H).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
77G ARG* 3.8 8.1 - - - +
78G ILE 2.9 13.8 + - - -
79G ILE* 3.9 17.7 - - - +
80G PRO* 4.0 4.3 - - - +
51H ILE* 1.3 76.9 - - - +
53H SER* 1.3 54.6 + - - +
54H LYS* 3.7 4.1 + - - +
55H ALA* 3.3 20.1 + - - +
56H MET* 2.7 33.8 + - - +
-55J G 4.9 0.4 - - - -
-54J A 3.5 19.3 - - - -
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Residues in contact with SER 53 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
52H SER* 1.3 68.7 - - - +
54H LYS* 1.3 59.6 + - - +
56H MET* 3.0 8.8 + - - +
57H SER* 2.7 36.2 + - - -
-54J A 2.8 26.4 + - - -
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Residues in contact with LYS 54 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
99B GLY* 5.2 1.2 - - - -
80G PRO* 3.9 17.3 - - + -
104G GLN* 5.0 16.8 - - + -
52H SER* 3.3 4.5 + - - +
53H SER* 1.3 79.4 - - - +
55H ALA* 1.3 66.2 + - - +
57H SER* 3.2 9.3 + - - -
58H ILE* 3.0 30.4 + - + +
-55J G 5.3 7.5 + - - -
-54J A 4.8 0.2 + - - -
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Residues in contact with ALA 55 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
78G ILE* 3.4 30.3 - - + +
79G ILE* 3.9 4.0 - - - -
80G PRO* 3.7 16.1 - - + +
83G LEU* 3.7 10.4 - - + +
51H ILE* 3.4 17.0 - - + -
52H SER* 3.3 8.8 + - - +
53H SER 3.2 0.4 - - - -
54H LYS* 1.3 78.5 - - - +
56H MET* 1.3 63.1 + - - +
58H ILE* 3.2 5.2 + - - +
59H MET* 3.1 23.4 + - - +
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Residues in contact with MET 56 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
33H SER* 5.7 0.2 - - - +
35H ALA* 3.0 54.3 - - + +
38H VAL* 3.7 28.3 - - + -
39H TYR* 4.0 13.2 - - + +
51H ILE* 4.0 27.4 - - + -
52H SER 2.7 18.4 + - - +
53H SER* 3.0 11.2 + - - +
55H ALA* 1.3 73.0 - - - +
57H SER* 1.3 64.5 + - - +
59H MET* 3.1 5.6 + - - +
60H ASN* 2.9 21.6 + - + +
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Residues in contact with SER 57 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
99B GLY* 3.3 25.8 + - - -
101B GLY* 4.8 5.5 + - - -
53H SER 2.7 16.4 + - - -
54H LYS* 3.4 13.2 - - - -
56H MET* 1.3 74.3 - - - +
58H ILE* 1.3 54.2 + - - +
60H ASN* 2.8 28.2 + - - +
61H SER* 2.9 17.3 + - - -
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Residues in contact with ILE 58 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
98B TYR* 3.8 26.7 - - + +
99B GLY* 4.0 17.0 - - - -
80G PRO* 3.7 16.8 - - + -
83G LEU* 3.7 19.7 - - + -
102G ILE* 3.7 31.4 - - + -
103G ALA* 3.7 15.3 - - + +
54H LYS* 3.0 22.3 + - + +
55H ALA 3.6 4.7 - - - +
57H SER* 1.3 72.5 - - - +
59H MET* 1.3 68.0 + - - +
60H ASN 3.2 0.2 + - - -
61H SER* 3.3 9.2 + - - -
62H PHE* 2.8 23.3 + - + +
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Residues in contact with MET 59 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
59G THR* 3.3 42.6 - - + +
62G ILE* 3.6 27.4 - - + -
63G LEU* 3.8 16.2 - - + -
83G LEU* 3.9 13.2 - - + -
38H VAL* 4.0 24.5 - - + -
51H ILE* 4.2 13.0 - - + -
55H ALA 3.1 17.5 + - - +
56H MET 3.4 8.3 - - - +
58H ILE* 1.3 77.2 - - - +
60H ASN* 1.3 58.1 + - - +
62H PHE* 3.2 17.3 + - + +
63H VAL* 2.9 35.1 + - - +
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Residues in contact with ASN 60 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
101B GLY* 6.1 1.2 - - - -
102B GLY* 4.7 3.2 + - - -
32H GLU 4.9 2.2 + - - -
33H SER* 3.6 26.0 + - - +
34H TYR* 2.9 38.8 + - - +
35H ALA 4.1 1.6 + - - +
38H VAL* 5.7 1.6 - - + -
56H MET* 2.9 13.6 + - + +
57H SER* 2.8 17.6 + - - +
59H MET* 1.3 74.7 - - - +
61H SER* 1.3 63.0 + - - +
63H VAL* 3.2 4.4 + - - +
64H ASN* 3.0 42.7 + - - +
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Residues in contact with SER 61 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
97B LEU 5.0 0.4 - - - -
98B TYR* 3.5 31.3 - - - -
99B GLY* 3.2 21.0 + - - -
100B PHE 4.5 0.7 + - - -
101B GLY 3.7 16.5 + - - -
102B GLY* 4.1 12.8 + - - +
57H SER 2.9 8.4 + - - -
58H ILE 3.4 7.6 - - - -
60H ASN* 1.3 72.8 - - - +
62H PHE* 1.3 54.1 + - - -
64H ASN* 3.0 4.0 + - - +
65H ASP* 2.8 35.0 + - - +
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Residues in contact with PHE 62 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
98B TYR* 3.6 27.9 - + + -
55G LEU* 5.1 2.7 - - + -
58G LEU* 3.9 43.7 - - + -
59G THR* 4.3 5.8 - - - -
62G ILE* 3.8 29.8 - - + -
93G LEU* 5.4 1.3 - - + -
96G LEU* 4.6 7.6 - - + -
97G LEU* 4.1 17.5 - - + -
58H ILE* 2.8 17.5 + - + +
59H MET* 3.3 23.1 - - + +
61H SER* 1.3 73.9 - - - +
63H VAL* 1.3 69.7 + - + +
65H ASP* 3.8 0.3 - - - +
66H VAL* 3.0 52.8 + - + +
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Residues in contact with VAL 63 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
25G PHE* 3.9 16.4 - - + -
55G LEU* 3.7 20.3 - - + +
59G THR* 4.1 17.0 - - + +
34H TYR* 3.7 39.0 - - + -
38H VAL* 4.5 12.8 - - + -
59H MET 2.9 25.7 + - - +
60H ASN 3.9 3.6 - - - +
62H PHE* 1.3 82.1 - - + +
64H ASN* 1.3 60.8 + - - +
67H PHE* 2.9 30.1 + - - +
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Residues in contact with ASN 64 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
102B GLY* 2.9 39.1 + - - +
33G LEU* 5.5 1.7 - - - +
34H TYR* 3.1 24.1 + - - -
60H ASN* 3.0 34.2 + - - +
61H SER 3.6 5.2 - - - +
63H VAL* 1.3 72.9 - - - +
65H ASP* 1.3 67.3 + - - +
67H PHE* 3.2 9.0 - - - +
68H GLU* 2.9 33.2 + - - +
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Residues in contact with ASP 65 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91B LYS* 5.3 9.1 + - - +
96B THR* 4.3 6.4 + - + +
98B TYR* 2.6 40.3 + - + +
102B GLY 5.2 0.6 + - - -
100G VAL* 4.0 4.9 - - - +
61H SER 2.8 16.6 + - - +
62H PHE 3.8 0.4 - - - +
64H ASN* 1.3 72.0 - - - +
66H VAL* 1.3 64.6 - - - +
68H GLU* 2.9 23.6 + - - +
69H ARG* 2.7 54.3 + - - +
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Residues in contact with VAL 66 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
98B TYR* 5.1 1.3 - - - +
55G LEU* 3.9 15.9 - - + -
58G LEU* 4.0 16.8 - - + -
96G LEU* 4.9 9.9 - - + -
97G LEU* 5.4 2.2 - - + -
62H PHE* 3.0 48.9 + - + +
63H VAL* 5.0 0.2 - - - -
65H ASP* 1.3 82.4 - - + +
67H PHE* 1.3 64.1 + - - +
69H ARG* 3.8 10.9 - - + +
70H ILE* 2.8 48.7 + - + +
99H LEU* 5.3 4.3 - - + -
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Residues in contact with PHE 67 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
30G VAL* 3.9 18.8 - - + -
33G LEU* 3.8 33.2 - - + -
34G LEU* 4.1 14.1 - - + -
39G TYR* 3.9 24.9 - + - -
51G LEU* 3.7 23.6 - - + +
55G LEU* 3.9 23.7 - - + +
34H TYR* 3.9 20.9 - - - +
63H VAL 2.9 20.5 + - - +
64H ASN* 3.2 11.7 - - - +
66H VAL* 1.3 78.0 - - - +
68H GLU* 1.3 61.2 + - + +
70H ILE* 3.7 1.7 - - - +
71H ALA* 2.8 37.5 + - + +
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Residues in contact with GLU 68 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91B LYS* 2.7 32.5 + - - -
102B GLY 4.7 8.4 - - - +
80D TYR* 5.5 7.9 - - - -
39G TYR* 4.1 20.7 - - + +
64H ASN* 2.9 18.5 + - - +
65H ASP* 2.9 14.5 + - - +
67H PHE* 1.3 76.4 - - + +
69H ARG* 1.3 56.6 + - + +
71H ALA* 3.9 0.6 - - - +
72H GLY* 2.6 36.4 + - - -
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Residues in contact with ARG 69 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
96G LEU* 3.2 43.5 + - - +
97G LEU* 3.7 15.2 - - - +
100G VAL* 4.0 9.3 - - - +
65H ASP* 2.7 51.2 + - - +
66H VAL* 3.8 12.4 - - + +
68H GLU* 1.3 76.4 - - + +
70H ILE* 1.3 63.2 + - + +
72H GLY* 3.2 1.5 + - - -
73H GLU* 3.0 19.9 + - - +
76H ARG* 5.2 1.9 + - - +
98H LEU* 3.3 33.7 + - + +
----------------------------------------------------------
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Residues in contact with ILE 70 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
51G LEU* 4.2 15.3 - - + -
54G VAL* 3.8 26.5 - - + -
55G LEU* 5.1 0.4 - - + -
58G LEU* 5.2 1.1 - - + -
66H VAL* 2.8 44.1 + - + +
67H PHE 3.9 2.0 - - - +
69H ARG* 1.3 72.1 - - + +
71H ALA* 1.3 63.7 + - - +
73H GLU 3.3 0.3 + - - -
74H ALA* 3.0 21.4 + - - +
91H ILE* 4.1 20.9 - - + +
94H ALA* 3.6 19.0 - - + +
95H VAL* 3.9 21.1 - - + -
98H LEU* 3.7 18.2 - - + -
99H LEU* 5.4 4.9 - - + -
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Residues in contact with ALA 71 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
34G LEU* 4.1 18.4 - - + -
39G TYR* 3.6 38.3 - - + +
51G LEU* 5.1 2.4 - - + +
67H PHE* 2.8 25.5 + - + +
68H GLU 3.9 0.9 - - - +
70H ILE* 1.3 71.3 - - - +
72H GLY* 1.3 59.0 + - - +
74H ALA* 3.7 6.0 - - - +
75H SER* 2.8 31.9 + - - -
86H ILE* 4.6 0.4 - - - +
91H ILE* 5.0 3.1 - - - +
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Residues in contact with GLY 72 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
39G TYR* 4.3 6.9 - - - -
68H GLU 2.6 22.7 + - - -
69H ARG 3.2 1.1 + - - -
71H ALA* 1.3 74.2 - - - +
73H GLU* 1.3 57.0 + - - +
75H SER* 3.3 6.8 - - - -
76H ARG* 3.0 49.8 + - - +
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Residues in contact with GLU 73 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72F TYR* 2.7 31.9 + - - -
92F ARG* 3.2 24.8 + - - +
69H ARG 3.0 16.0 + - - +
70H ILE 3.8 2.9 - - - +
72H GLY* 1.3 72.1 - - - +
74H ALA* 1.3 61.0 + - - +
76H ARG* 3.2 32.9 + - - +
77H LEU* 2.8 29.6 + - + +
94H ALA* 4.0 12.6 - - + +
97H LEU* 3.6 25.9 - - + +
98H LEU* 4.0 14.1 - - + +
----------------------------------------------------------
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Residues in contact with ALA 74 (chain H).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
70H ILE 3.0 16.8 + - - +
71H ALA* 3.7 4.7 - - - +
73H GLU* 1.3 77.2 - - - +
75H SER* 1.3 64.0 + - - +
77H LEU* 3.3 9.3 + - - +
78H ALA* 3.1 23.0 + - - +
86H ILE* 4.1 17.4 - - + +
90H GLU* 4.2 11.8 - - + +
91H ILE* 4.0 23.3 - - + -
94H ALA* 3.9 12.5 - - + +
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Residues in contact with SER 75 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
38G ASN 4.8 1.2 + - - -
39G TYR* 2.7 44.3 + - - +
71H ALA 2.8 17.7 + - - -
72H GLY* 3.3 7.0 - - - -
74H ALA* 1.3 78.1 - - - +
76H ARG* 1.3 63.0 + - - +
78H ALA* 3.3 3.3 + - - +
79H HIS* 3.2 35.4 + - - -
86H ILE* 3.9 7.7 - - - +
----------------------------------------------------------
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Residues in contact with ARG 76 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91F LYS* 6.1 3.4 - - - -
92F ARG* 5.8 1.0 - - - +
69H ARG* 5.2 2.2 + - - +
72H GLY* 3.0 33.9 + - - +
73H GLU* 3.2 46.9 + - - +
75H SER* 1.3 75.4 - - - +
77H LEU* 1.3 65.4 + - - +
79H HIS* 3.0 9.8 + - + +
80H TYR* 2.9 59.9 + - + +
----------------------------------------------------------
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Residues in contact with LEU 77 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72F TYR* 3.6 33.9 - - + +
75F HIS* 3.8 31.2 - - + +
73H GLU* 2.8 22.0 + - - +
74H ALA* 3.4 7.9 - - - +
76H ARG* 1.3 72.0 - - - +
78H ALA* 1.3 63.0 + - - +
80H TYR* 3.2 8.4 + - - +
81H ASN* 2.7 35.0 + - - +
90H GLU* 3.6 22.9 - - + +
93H THR* 3.5 33.7 - - + -
94H ALA* 3.8 9.6 - - - +
97H LEU* 4.5 2.2 - - + -
----------------------------------------------------------
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Residues in contact with ALA 78 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
75F HIS* 5.9 0.4 - - - -
40G ALA* 5.0 5.2 - - + -
74H ALA 3.1 10.3 + - - +
75H SER* 3.5 9.2 - - - +
76H ARG 3.3 0.2 - - - -
77H LEU* 1.3 79.6 - - - +
79H HIS* 1.3 65.5 + - + +
81H ASN* 3.3 3.1 + - - +
82H LYS 3.1 4.3 + - - -
83H ARG* 3.0 41.4 + - + +
85H THR 4.1 20.4 - - - +
86H ILE* 4.5 9.9 - - + -
90H GLU* 4.4 9.6 - - + +
----------------------------------------------------------
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Residues in contact with HIS 79 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
36C LYS 3.8 15.4 + - - -
37C GLY* 3.9 17.0 + - - -
38C ASN* 3.3 29.9 + - + +
39G TYR 3.7 16.3 + - - -
40G ALA* 5.1 4.3 - - + -
41G GLU 6.0 0.2 - - - -
75H SER* 3.2 27.7 + - - -
76H ARG* 3.0 10.5 + - + +
78H ALA* 1.3 79.3 - - + +
80H TYR* 1.3 62.4 + - + +
82H LYS* 2.6 32.2 + - - +
83H ARG 4.9 6.7 + - - +
----------------------------------------------------------
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Residues in contact with TYR 80 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72F TYR* 4.0 25.1 - + + -
88F TYR* 3.3 75.6 + + + +
91F LYS* 4.7 12.3 - - - +
73H GLU* 4.8 0.2 - - - -
76H ARG* 2.9 56.8 + - + +
77H LEU* 3.5 6.5 - - - +
79H HIS* 1.3 79.8 - - + +
81H ASN* 1.3 66.1 + - - +
82H LYS* 3.7 7.1 + - - +
----------------------------------------------------------
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Residues in contact with ASN 81 (chain H).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72F TYR* 5.0 1.9 + - - +
75F HIS* 3.6 27.6 + - + +
76F ALA* 3.3 30.3 - - - +
78F ARG* 5.2 0.5 + - - -
77H LEU* 2.7 32.4 + - - +
78H ALA* 4.0 3.3 - - - +
79H HIS 3.1 1.0 - - - -
80H TYR* 1.3 82.3 - - - +
82H LYS* 1.3 75.1 + - - +
83H ARG* 3.2 34.2 + - + +
----------------------------------------------------------
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A short description of the
analytical approach
The contact analysis used in this page
is based upon the approach
developed in:
Sobolev V., Wade R.C., Vriend G.
and Edelman M. PROTEINS (1996)
25, 120-129.
Contact legitimacy depends on the hydrophobic-hydrophilic
properties of the contacting atoms. In order to
define it, for each inter-atomic contact,
eight atom classes have been introduced:
I Hydrophilic - N and O that can donate and accept hydrogen bonds
(e.g., oxygen of hydroxyl group of Ser. or Thr)
II Acceptor - N or O that can only accept a hydrogen bond
III Donor - N that can only donate a hydrogen bond
IV Hydrophobic - Cl, Br, I and all C atoms that are not in
aromatic rings and do not have a covalent bond to
a N or O atom
V Aromatic - C in aromatic rings irrespective of any other
bonds formed by the atom
VI Neutral - C atoms that have a covalent bond to at least one
atom of class I or two or more atoms from class II
or III; atoms; S, F, P, and metal atoms in all cases
VII Neutral-donor - C atoms that have a covalent bond with only one
atom of class III
VIII Neutral-acceptor - C atoms that have a covalent bond with only
one atom of class II
For each pair of contacts the state of legitimacy
is shown below:
Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically
assigned based on the atomic coordinates. However, in
three cases (see below) the automatic assignment
is currently ambiguous. In these
cases, the user is advised to manually analyse
the full list of contacts using
LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are
considered "aromatic" (Class V) if the ring is approximately
planar, and "hydrophobic" (Class IV) or "neutral" (Classes
VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
"hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
"carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).
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